Loading...
2018 Macroinvertebrate Assessment CLACKAMAS COUNTY NPDES MS4 CO-PERMITTEES 2018 COORDINATED MACROINVERTEBRATE ASSESSMENT Clackamas County, Oregon -A. ,1 � ; � � . � ', FINAL REPORT ,,: x;» c, e ._ ; Prepared for ,r� , .� _, .�., . i ,• .� =. l' .. _ • -„_ � � ''"° IS° ; Fit ,'.'bf: . _ ,� sf� , City of Gladstone r W -- • ;, � 'S :. ; K ,�:` City of Lake Oswego-- � >� ��- �- � . � , =� City of Milwaukie `4 � L. � - . City of Oregon City :, .� ` —- 1 , w - ,-- City of West Linn -- - City of Wilsonville •S L-t fib; � T .� :. _�4.1.. 'F.6�_ w Oak Lodge Water Services Tr .1c t.>. By R.. - Michael B. Cole, Ph.D. ��z " - -_ ' ` = Christopher T. Burtch 1.440 r . ,. - :,. Cole Ecological, Inc. Yf` f -. January 2019 'p.�;'� 4 1= �, .� ti ot . A- ..•*:- "t4,. - „.4. ,0 i, ., .., 9,6- .1' ,..:-. -N.... - 04. 1�,�. ; L of"' ___4r, iltetiC .;rx y ti R 4 y • vf��1� �ti�• ,i `1`• fi..al CLACKAMAS COUNTY NPDES MS4 CO-PERMITTEES 2018 COORDINATED MACROINVERTEBRATE ASSESSMENT FINAL REPORT Prepared for City of Gladstone City of Lake Oswego City of Milwaukie City of Oregon City City of West Linn City of Wilsonville Oak Lodge Water Services By Michael B. Cole, Ph.D. & Christopher T. Burtch Cole Ecological, Inc. February 2019 EXECUTIVE SUMMARY In 2018, seven Clackamas County jurisdictions, including the cities of Gladstone, Lake Oswego, Milwaukie, Oregon City, West Linn, Wilsonville, and Oak Lodge participated in biological monitoring as required during the 2017-2022 NPDES MS4 permit period. Cole Ecological, Inc. sampled macroinvertebrate communities, stream physical habitat, and water chemistry from twenty-two stream reaches across these seven jurisdictions in the fall of 2018. The objectives of the study were to assess the current status of chemical, physical, and biological conditions in these waters, and as applicable, determine whether noticeable changes or trends in improvement or decline in biological conditions are occurring. Multimetric Index (MMI) scores and PREDATOR Marine Western Coastal Forest (MWCF) O/E scores calculated from macroinvertebrate community data indicated that biological conditions are generally similar to those measured in 2013 across the ten City of Lake Oswego study reaches. MMI scores ranged among the ten Lake Oswego reaches from 14 to 22, and eight of the ten sites scored lower than 20, corresponding to "severely disturbed" biological conditions. Only the Nettle Creek reach (MMI score = 20) and the Tryon Creek reach (MMI score = 22) scored outside of the "severely disturbed" range, and only marginally. 2018 MMI scores were within 2 points of 2013 MMI scores at nine of ten the Lake Oswego reaches, suggesting no notable change in biological conditions. Lake Oswego MWCF O/E scores ranged from 0.243 to 0.583, occurring exclusively in the "most disturbed" condition class. Comparison of 2018 MMI scores with 2013 MMI scores also suggest very similar conditions between the two sampling years. Temperature stressor (TS) scores indicate that compositional shifts in macroinvertebrate communities have occurred in response to elevated water temperature in six of the ten Lake Oswego stream reaches. Only lower the Lost Dog Creek, East Lost Dog Creek, West Lost Dog, and Nettle Creek reaches appear to support macroinvertebrate communities likely unaffected by elevated water temperatures. Fine sediment stressor (FSS) scores from eight of nine Lake Oswego samples collected from riffle habitats (i.e., all reaches other than Carter and Tryon creeks) indicated likely sediment-induced stress on macroinvertebrate communities in these reaches. MMI scores ranged from 10 to 38 among the twelve co-permittee reaches from the other six jurisdictions. Singer Creek received the highest MMI score of 38, corresponding to a slightly disturbed biological condition. Coffee Creek scored a 30, corresponding to slightly/moderately disturbed. The ten other co-permittee reaches received MMI scores ranging between 10 and 18, indicative of severely disturbed biological conditions. MWCF O/E scores ranged from 0.194 to 0.776 among the twelve co-permittee reaches, exclusively within the "most disturbed" condition class. MMI and O/E scores from Rinearson Creek, Boardman, Creek, and River Forest Creek were not assigned condition classes because only glides were sampled from these reaches. Temperature stressor(TS) scores indicate temperature-stress-induced shifts in macroinvertebrate communities have likely occurred in nine of the twelve co-permittee reaches. Only three reaches — Coffee, Singer, and Tanner — received temperature stress scores lower than the 90th percentile Cole Ecological,Inc. 1 2018 Clackamas Co.MS4 Macroinvertebrates threshold score of 18.4. Fine sediment stressor(FSS) scores indicate FS-induced stress in all seven of the eight co-permittee reaches from which riffle samples were collected. Only the Singer Creek benthic community received a fine sediment stressor score below the 90th percentile threshold score of 19%. Recovery of biological communities in these MS4 co-permittee area streams is dependent on identifying and improving stream conditions and functions that are currently impaired. While additional water quality data would further elucidate likely cause-effect relationships, stressor model results, combined with the results of physical habitat assessments, are suggestive of multiple stressors co-occurring in most streams assessed in this study. This phenomenon, known as "urban stream syndrome" or "multiple stress syndrome" is well documented among urban streams (Walsh et al. 2005). Mechanisms driving the syndrome are complex and interacting, yet rapid and unabated stormwater delivery into highly physically altered (often channelized) receiving waters is largely the source of the various perturbations observed and measured in this and other regional studies of stream conditions. These highly modified hydrologic patterns destabilize streamflows and alter seasonal high and low flows, pollutant concentrations, temperature and dissolved oxygen extremes, sediment inputs, and channel morphology, all which cumulatively degrade biological communities. Among pollutants entering streams through stormwater, pesticides have been receiving increased attention with respect to understanding their effects on the ecology of surface waters. Recent work in Clackamas County, Oregon found that several indicators of macroinvertebrate community condition were strongly negatively correlated with streambed sediment concentrations of the pyrethroid insecticide bifenthrin, now widely used in urban areas (Carpenter et al. 2016). Two streams from the 2018 co-permittees macroinvertebrate study, Lost Dog Creek and Tanner Creek, were implicated by the Carpenter et al. study as having bifenthrin concentrations in streambed sediments that were potentially deleterious to macroinvertebrates (Carpenter et al. 2016). Continued and expanded pesticides monitoring in Clackamas County and elsewhere could assist with further understanding this emerging issue as it relates to stormwater management and consequences to the biology in receiving waters. While many proximate factors may contribute to the biological degradation measured in this study, ultimately, causation in most cases can likely be attributed to stormwater. Protection of area streams should focus on minimizing total effective impervious areas and improving stormwater retention and drainage patterns to minimize the hydrologic effects of storm events on stream channel conditions. Further development within Clackamas County will necessitate careful attention to these and other measures intended to preserve and enhance stream conditions and functions. As such measures and other restoration activities are undertaken, these biological data will assist with determining the success of these actions relative to their intended benefits to aquatic life. Cole Ecological,Inc. ii 2018 Clackamas Co.MS4 Macroinvertebrates TABLE OF CONTENTS EXECUTIVE SUMMARY II LIST OF TABLES IV LIST OF FIGURES V LIST OF APPENDICES V INTRODUCTION 1 METHODS 2 SAMPLE SITE SELECTION 2 FIELD DATA COLLECTION 2 HABITAT ASSESSMENTS 3 HABITAT UNITS SURVEY 3 CROSS-SECTION SURVEYS 6 RIPARIAN SURVEYS 7 WATER QUALITY SAMPLING 8 MACROINVERTEBRATE SAMPLE COLLECTION 8 SAMPLE SORTING AND MACROINVERTEBRATE IDENTIFICATION 8 DATA ANALYSIS 9 MULTIMETRIC INDEX ANALYSIS 9 PREDATOR MWCF MODEL 10 STRESSOR MODELS 11 RESULTS 13 ENVIRONMENTAL CONDITIONS 13 LAKE OSWEGO STREAM REACHES 13 CO-PERMITTEE STREAM REACHES 14 MACROINVERTEBRATE COMMUNITY CONDITIONS 16 LAKE OSWEGO STREAM REACHES 16 Cole Ecological,Inc. 111 2018 Clackamas Co.MS4 Macroinvertebrates CO-PERMITTEE STREAM REACHES 20 DISCUSSION 24 RECOMMENDATIONS 28 LITERATURE CITED 29 LIST OF TABLES Table 1. List of 2018 Clackamas County MS4 co-permittee macroinvertebrate sample sites. 3 Table 2. Environmental variables measured in the field for characterizing stream reaches sampled for macroinvertebrates in Clackamas County, fall 2018. 6 Table 3. Multi-metric set and scoring criteria(WQIW 1999)used to assess the condition of macroinvertebrate communities from Clackamas County streams in fall 2018... 10 Table 4. Multimetric score ranges for assignment of macroinvertebrate community condition levels (WQIW 1999) 11 Table 5. Environmental conditions measured in 22 Clackamas County MS4 co-permittee stream reaches sampled for macroinvertebrates in fall 2018. 14 Table 6. Summary of Multimetric Index (MMI) scores, PREDATOR MWCF model O/E scores, and temperature (TS) and fine sediment(FSS) stressor model scores calculated from macroinvertebrate samples collected from 22 Clackamas County MS4 co-permittee streams in September 2018. Highlighted TS and FSS scores indicate values that exceed DEQ inferred stressor thresholds of 18.4°C and 19% fine sediment. Asterisk (*) indicates Oak Lodge reach scores from 2012 (rather than 2013). 17 Table 7. Multimetric Index scores and PREDATOR MWCF model O/E scores from stream reaches sampled in and adjacent to the City of Lake Oswego, Oregon, fall 2004, 2007, 2009, 2013, and 2018. 18 Table 8. Macroinvertebrate community metrics calculated from samples collected from Boeckman Creek below Rose Lane, Wilsonville, Oregon in 2003, 2013 and again in 2018 23 Table 9. Comparison of 2012 versus 2018 PREDATOR MWCF O/E scores and select community metrics calculated from macroinvertebrate samples collected from Boardman and River Forest creeks. 24 Cole Ecological,Inc. iv 2018 Clackamas Co.MS4 Macroinvertebrates LIST OF FIGURES Figure 1. 2018 Clackamas County NPDES co-permittees macroinvertebrate sample sites. 5 Figure 2. Substrate composition and embeddedness from pebble counts (or visual estimates where pebble counts were precluded)performed in 22 Clackamas County MS4 co-permittee streams sampled for determining conditions of macroinvertebrate communities in September 2018 15 Figure 3. Multimetric index(MMI) and Marine Western Coastal Forest (MWCF) PREDATOR model scores calculated from 22 macroinvertebrate samples collected from Clackamas County MS4 co-permittee streams in September 2018. 19 Figure 4. Panel 1 of individual community metric values calculated from macroinvertebrate samples collected from 22 Clackamas County MS4 co-permittee streams in September 2018. 21 Figure 5. Panel 2 of individual community metric values calculated from macroinvertebrate samples collected from 22 Clackamas County MS4 co-permittee streams in September 2018. 22 Figure 6. Distribution of macroinvertebrate community condition classes from 17 Clackamas County MS4 co-permittee streams sampled in September 2018, as determined from multimetric index (MMI) scores. Rinearson and Carter Creeks are not included in these results, as glides were sampled from each of these two reaches, thereby precluding the assignment of condition classes. 26 Figure 7. Relationship between MMI and O/E scores. 27 LIST OF APPENDICES Appendix 1. Environmental conditions measured from 22 Clackamas County NPDES MS4 co-permittee stream reaches, fall 2018 31 Appendix 2. Western Oregon multimetric index individual metric scores calculated from macroinvertebrate communities sampled from 22 Clackamas County NPDES MS4 co-permittee stream reaches in fall 2018. 32 Appendix 3. Reach Assessment Summary Sheets 33 Cole Ecological,Inc. V 2018 Clackamas Co.MS4 Macroinvertebrates INTRODUCTION As a condition of the Clackamas County National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4) permit, Clackamas County co-permittees updated their comprehensive NPDES MS4 stormwater monitoring program in 2017 (Brown and Caldwell 2017). This updated NPDES stormwater monitoring program requires biological monitoring throughout the Clackamas MS4 permit area at least once over the 2017-2022 permit period. The objectives of the biological monitoring component are as follows: • Evaluate status and long-term trends in receiving waters associated with MS4 stormwater discharges; and • Assess the chemical, biological, and physical effects of MS4 stormwater discharges on receiving waters Specifically, the comprehensive monitoring plan states that monitoring activities will attempt to address the following questions (Brown and Caldwell 2017): • What are the biological conditions of receiving waters? • Based on historic macroinvertebrate sampling efforts (as applicable), are there noticeable trends of improvement or impairment in receiving waters? The first coordinated biological monitoring effort by six of the Clackamas County NPDES MS4 co-permittees occurred in 2013 (Cole 2014). In 2018, seven Clackamas County jurisdictions, including the cities of Gladstone, Lake Oswego, Milwaukie, Oregon City, West Linn, Wilsonville, and Oak Lodge participated in biological monitoring as required at least once during the 2017-2022 NPDES MS4 permit period. Prior to implementation of coordinated biological monitoring under the 2012-2017 NPDES MS4 permit period, among these seven jurisdiction, only the City of Lake Oswego had historically performed regular biological monitoring of their receiving waters, having assessed macroinvertebrate communities in 2004, 2007, 2009, and 2013 (Lemke & Cole 2009). The City of Wilsonville performed a macroinvertebrate assessment in 2003 (Cole 2003), and Oak lodge performed a macroinvertebrate assessment in 2012 (Cole& Haxton 2013). The 2013 coordinated assessment represented the first biological assessment by the other jurisdictions of their receiving waters. In the present study, Cole Ecological (CE), Inc. sampled macroinvertebrate communities, stream physical habitat, and water chemistry from twenty-two stream reaches across these seven jurisdictions in the fall of 2018. As stated above, the objectives of the study were to assess the current status of chemical, physical, and biological conditions in these waters, and as applicable, determine whether noticeable trends in improvement or decline in biological conditions are occurring. In order to meet Cole Ecological,Inc. 1 2018 Clackamas Co.MS4 Macroinvertebrates these objectives, results of the 2018 assessment were compared to those from previous years (2003-2013) in order determine whether measurable changes or trends have occurred in any of the assessed waterbodies. METHODS SAMPLE SITE SELECTION Biological sample sites under this program were selected for the cities of Lake Oswego, Wilsonville, and Oak Lodge to correspond with previously assessed locations in order to determine whether trends or changes in biological conditions have occurred as compared to prior sampling efforts (Table 1 and Figure 1). Sample sites within the City of Lake Oswego were originally selected in 2004 and 2007 (Cole & Harris 2004; Lemke & Cole 2007) to provide representative coverage of perennial streams within the city. Six reaches were initially selected and sampled in 2004 (Table 1). In 2007, an additional five reaches were added to the previously surveyed reaches, while the Blue Heron Creek reach was dropped from sampling. These same ten stream reaches were sampled for the City of Lake Oswego in 2009, 2013, and 2018. The City of Wilsonville performed a comprehensive biological assessment of eleven reaches in Boeckman Creek, Coffee Lake Creek, and Mill Creek in 2003 (Cole 2004). One reach in Boeckman Creek, presently also used as a water quality monitoring station by the City, was re-assessed under the 2013 comprehensive monitoring program. In 2017, two additional previously-assessed reaches on Boeckman Creek were added to the 2018 biological monitoring effort (Table 1). Oak Lodge first sampled the Boardman and River Forest creek reaches included in this study back in 2012 (Cole & Haxton 2013). The cities of Gladstone, Milwaukie, Oregon City, and West Linn each initiated macroinvertebrate sampling in 2013 as part of the coordinated monitoring effort. Macroinvertebrate sample sites within these jurisdictions were co-located with current water quality and pesticide monitoring sites in order to provide greater opportunity for examining relationships between water quality and biological conditions (Brown and Caldwell 2012). Among these six sample sites first assessed in 2013, only one was re- located in 2018: the Rinearson Creek sample site was relocated approximately 300 m downstream (Table 1, Figure 1). FIELD DATA COLLECTION Macroinvertebrate communities, physical habitat, and water chemistry were sampled at the 22 study reaches between 14 and 22 September, 2013. First, each study reach was marked and the reach length was measured. Each sample reach measured approximately 75 m, unless the sample reach was obstructed by a culvert, heavy vegetation, or other impediments. Cole Ecological,Inc. 2 2018 Clackamas Co.MS4 Macroinvertebrates Table 1. List of 2018 Clackamas County MS4 co-permittee macroinvertebrate sample sites. Habitat Past Sample Site Sample Site Location Jurisdiction Sampled Lat Long Assessments Rinearson Creek River Road Gladstone Glide 45.3804 -122.6076 13 Ball Creek at Kruse Oaks Blvd Lake Oswego Riffle 45.4245 -122.7403 04,'07,'09,'13 Carter Creek at Bangy Lake Oswego Glide 45.4170 -122.7406 07,'09,'13 Lost Dog Creek(lower) at Lake Front Dr Lake Oswego Riffle 45.4006 -122.6891 04,'07,'09,'13 Lost Dog Crk(East Br.) at Stafford Rd Lake Oswego Riffle 45.4026 -122.6806 07,'09,'13 Lost Dog Crk(West Br.) Lake Oswego Golf Course Lake Oswego Riffle 45.4100 -122.6782 07,'09,'13 Nettle Creek at Iron Mtn Blvd Lake Oswego Riffle 45.4246 -122.6814 04,'07,'09,'13 Oswego Creek downstream of Hwy 43 Lake Oswego Riffle 45.4107 -122.6625 07,'09,'13 Springbrook Crk(lower) at Iron Mtn Park Lake Oswego Riffle 45.4142 -122.7078 04,'07,'09,'13 Springbrook Crk(rest.) upstream of Boones Way Lake Oswego Riffle 45.4140 -122.7151 04,'07,'09,'13 Tryon Creek Upstream of Hwy 43 Lake Oswego Riffle 45.4243 -122.6613 07,'09,'13 Minthorn Creek at SE Lake Road Milwaukie Riffle 45.4318 -122.5984 13 River Forest Creek at Risley Park Oak Lodge Glide 45.4075 -122.6400 12 Boardman Creek(rest.) at Stringfield Park Oak Lodge Glide 45.3988 -122.6253 12 Boardman Creek(upper) at Boardman Ave Oak Lodge Glide 45.3945 -122.6175 12 Coffee Creek at 5th Ave Oregon City Riffle 45.3461 -122.6182 13 Singer Creek in Singer Creek Park Oregon City Riffle 45.3477 -122.6020 13 Tanner Creek at Imperial Drive West Linn Riffle 45.3517 -122.6310 13 Trillium Creek at Caloroga Rd West Linn Riffle 45.3957 -122.6378 13 Boeckman Creek(rest.) Downstream of Rose Ln Wilsonville Riffle 45.2992 -122.7549 03,'13 Boeckman Creek(middle) at Kolbe Lane Bridge Wilsonville Riffle 45.3012 -122.7568 03 Boeckman Creek(upper) at Boeckman Cr trail bridge Wilsonville Riffle 45.3091 -122.7530 03 HABITAT ASSESSMENTS Habitat surveys were performed in the reaches following modified Rapid Stream Assessment Technique (RSAT) protocols (adapted from Clean Water Services 2000) and consisted of data collection from surveys of channel habitat units, three channel cross sections, and the adjacent riparian zone (Table 2). First, the valley type within which each study reach occurred was broadly classified as U-type, V-type, ponded, or floodplain. A plan view of the reach was sketched as the survey was performed. The physical data were then collected using the following procedures: HABITAT UNITS SURVEY The number, length, width, maximum water depth, and gradient of pools, glides, riffles, and rapids were recorded from each reach. The following definitions were adapted Cole Ecological,Inc. 3 2018 Clackamas Co.MS4 Macroinvertebrates from ODFW's Methods for Stream Habitat Surveys (2002) and Armantrout (1998) and used for this study: Pool: Water surface slope is usually zero. Pools are normally deeper and wider than aquatic habitats immediately above and below. Glide: There is a general lack of consensus of the definition of glides (Hawkins et al. 1993). For the purposes of this study, a glide was defined as an area with generally uniform depth and flow with no surface turbulence. Glides have a low-gradient water surface profile of 0-1% slope. Glides may have some small scour areas but are distinguished from pools by their overall homogeneity and lack of structure. Glides are generally deeper than riffles with few major flow obstructions and low habitat complexity. Riffle: Fast, turbulent, shallow flow over submerged or partially submerged gravel and cobble substrates. Riffles generally have a broad, uniform cross section and a low-to-moderate water surface gradient, usually 0.5-2.0% slope and rarely up to 6%. Rapid: Swift, turbulent flow including chutes and some hydraulic jumps swirling around boulders. Rapids often contain exposed substrate features composed of individual bedrock or boulders, boulder clusters, and partial bars. Rapids are moderately high gradient habitat, usually 2.0-4.0% slope and occasionally 7.0-8.0%. Rapids also include swift, turbulent, "sheeting" flow over smooth bedrock. Cascade: Fast, turbulent flow with many hydraulic jumps and strong chutes and eddies, 30-80%white water. Gradients approaching or exceeding 10.0%. The following attributes were then measured or visually estimated in each channel unit. Dominant substrate was visually estimated in each unit using substrate size classes adapted from EPA's Environmental Monitoring & Assessment Program (EMAP) protocols for wadeable streams (USEPA 2000). Percent substrate embeddedness, percent actively eroding banks, and percent undercut banks (both banks, combined) were each visually estimated. Water surface slope of each unit was measured with a clinometer and the value of woody debris to fish in each unit was rated on a scale from one to five, with one representing little or no wood, and five representing large amounts of wood creating abundant cover and refuge. Additionally, all woody debris measuring at least 15 cm in diameter (at estimated diameter breast height) and 2 m in length was tallied for each unit and the configuration, type, location, and size of root wads and pieces of wood were noted. Overhead cover was measured with a spherical densiometer in four directions (upstream, downstream, right, left) from the center of the stream at evenly spaced intervals along the length of the reach (usually every 15 m). Habitat features such as beaver activity, culverts, and potential fish passage barriers were noted by habitat unit. Cole Ecological,Inc. 4 2018 Clackamas Co.MS4 Macroinvertebrates 2018 Macroinvertebrate Sample Sites --, 4ittisi r /{-C 4.v.ym - -_ , - ? - t• i` em �:s F ___ - _ _ I _y. MultaiauuV, ._. Minthor n'Creek CliclMilx 1, 8. _rt ( i 1Nettle Creek�' r Ball Crk i . i -AP Tryon Creek �� — . Y , -r- ii ( __LA.r Va.s•5. r' Gaiter Creek - Usk Gros,"/-- �. kSpringbrook Creek LOWER _ " . Springhrook Creek REST �-•Oswego.Creek ` Lost f1 i ..,,River Forest Creek C --- Lost Dog•EAST. i 1�-t. Boardman'Creek REST ' /j: : Lost Dog WEST Trillium'Creet -,y �.' c.. .a — �,• } • • r Boardman Creek UPPER • li Legend --- �... earson Creek ; �'R� • Sample Sites Fes`' `: r' 00-751.5 3 f7( m=m= i. , Km , �.. �..�. � Stied - n • • i 1(1-- ' ‘.\, .,'.?..._ f . Tanner Creek 7-f-71 • a a , f _ 1i f Singer Creek 1 ! CafFee Creek g 3 G' I --, .rCrEs MO LW?A rN Fr-"--.- I ) i .) \ 11 Boeckman Creek UPPER ibir: -�. 1 l • � � 1 Boeckman Creek MID j Boeckman Creek REST COLEA -- ," rI BC OLOGICAL,ham pes:Er'.U.r �AOAA.Sour Esrii f rmin.USGS PS Figure 1. 2018 Clackamas County NPDES co-permittees macroinvertebrate sample sites. Cole Ecological,Inc. 5 2018 Clackamas Co.MS4 Macroinvertebrates Table 2. Environmental variables measured in the field for characterizing stream reaches sampled for macroinvertebrates in Clackamas County, fall 2018. Quantitative or Visual Estimate or Categorical Measured Variable Variable Wetted Width Q M Bankfull Width Q M Bankfull Height Q M Mean Water Depth Q M Pools(%of reach length) Q M Glides(%of reach length) Q M Riffles(%of reach length) Q M Rapids(%of reach length) Q M Cascades(%reach length) Q M Reach Embeddedness(%) Q V Eroding Banks(%) Q V Undercut Banks(%) Q V Substrate Composition Q M Substrate Embeddedness(%) Q M Large Wood Rating Q M Overhead Canopy Cover(%) Q M Riparian Buffer Width Q V Riparian Zone Tree Cover(%) Q V Non-native Riparian Veg. Cover(%) Q V Dominant Adjacent Land Use C V Water Temperature(°C) Q M Specific Conductance(µS/cm) Q M Dissolved Oxygen(mg/L) Q M CROSS-SECTION SURVEYS Channel dimensions were measured at three transects occurring within each sample reach. The three habitat units were selected according to the following guidelines: 1. Three separate riffles were sampled if three or more riffles occurred in the reach. 2. If two riffles occurred in the reach, both riffles and a representative glide or pool (least preferred) were sampled. If riffles were of sufficient length (10 m or longer) Cole Ecological,Inc. 6 2018 Clackamas Co.MS4 Macroinvertebrates then more than one set of cross-section measurements were made in the riffle to ensure that all measurements were taken from this habitat type. 3. If only one riffle occurred within the reach, two additional units that represented channel dimensions and substrate composition were sampled. If the riffle was longer than 20 m, then all three sets of measurements were taken from the riffle. 4. If no riffles occurred in the reach, three units that were representative of the channel dimensions and substrate composition occurring within the reach were sampled. At each of the three channel cross sections, wetted width (WW), bankfull width (BFW), maximum bankfull height (BFHmax), the bankfull height at 25%, 50%, and 75% across the distance of the bankfull channel, and the flood-prone width (FPW) were measured with a tape measure and survey rod. From these channel dimension data, width-to-depth and channel-entrenchment ratios were later calculated. Water depths were recorded at 10%, 30%, 50%, 70%, and 90% across the width of the wetted channel. Maximum bank height (Left or Right) and bank angles were visually estimated. Pebble counts were performed in riffles when they represented an adequate amount of the stream channel area to allow measurement of at least 100 substrate particles along transects. If riffles occupied less than 10% of the total habitat area in the reach (e.g. if macroinvertebrate samples were collected from glides in reaches where benthic sampling occurs), then pebble counts occurred in glides. Pebble counts were performed using the "heel-to-toe" method, starting at the bankfull edge on one side of the channel and walking heel-to-toe to the other edge (USEPA 2000). With each step, the surveyor looked away and touched the streambed at the tip of their toe. The size class and embeddedness of each piece of streambed substrate was estimated until at least 100 particles were counted. RIPARIAN SURVEYS Adjacent riparian conditions were characterized beyond the left and right banks separately and according to a number of attributes. The dominant plant community type(s) (ash woodland, willow shrub—scrub, upland forest, etc.) occurring in the riparian zone to the edge of human-dominated activity was classified and recorded and the approximate width of each of these community types was visually estimated. The percent vegetative cover of the canopy layer (>5 m high), shrub layer (0.5 to 5 m high), and groundcover layer (<0.5 m high) was estimated, as well as the percent cover of invasive or non-native species as a single estimate across all three vegetative layers. The dominant adjacent land use outside of the vegetated riparian buffer was noted, and then a cross- sectional diagram of the riparian zone was sketched. Cole Ecological,Inc. 7 2018 Clackamas Co.MS4 Macroinvertebrates WATER QUALITY SAMPLING Water quality was sampled from each sample reach prior to collecting macroinvertebrates and performing the reach habitat assessment. Measured water quality parameters included temperature (°C), dissolved oxygen (mg/L), oxygen saturation (%), conductivity (µS/cm), and specific conductance (µS/cm). Water temperature, dissolved oxygen, conductivity, and specific conductance were measured in situ with a YSI Model 556 water chemistry meter. MACROINVERTEBRATE SAMPLE COLLECTION Macroinvertebrates were collected using the Oregon Department of Environmental Quality's (DEQ) Benthic Macroinvertebrate Protocol for Wadeable Rivers and Streams (DEQ 2003). An 8-kick composite sample was collected from riffles in higher-gradient reaches that supported sufficient riffle habitat; glides were sampled from lower-gradient reaches that lacked riffle habitat. Instream sampling points were selected to apportion the eight kick samples among as many as four habitat units. Macroinvertebrates were collected with a D-frame kicknet(30 cm wide, 500 µm mesh opening) from a 30 x 30 cm (1 x 1 ft) area at each sampling point. Larger pieces of substrate, when encountered, were first hand-washed inside the net, and then placed outside of the sampled area. Then the area was thoroughly disturbed by hand(or by foot in deeper water)to a depth of—10 cm. The eight samples from the reach were composited and carefully washed through a 500 µm sieve to strain fine sediment and hand remove larger substrate and leaves after inspection for clinging macroinvertebrates. The composite sample then was placed into one or more 1-L polyethylene wide-mouth jars, labeled, and preserved with 80% denatured ethanol for later sorting and identification at the laboratory. SAMPLE SORTING AND MACROINVERTEBRATE IDENTIFICATION Samples were sorted to remove a 500-organism subsample from each preserved sample following the procedures described in the DEQ Level 3 protocols (Water Quality Interagency Workgroup [WQIW], 1999) and using a Caton gridded tray, as described by Caton (1991). Contents of the sample were first emptied onto the gridded tray and then floated with water to evenly distribute the sample material across the tray. Squares of material from the 30-square gridded tray were transferred to a Petri dish, which was examined under a dissecting microscope at 7-10X magnification to sort aquatic macroinvertebrates from the sample matrix. Macroinvertebrates were removed from each sample until at least 500 organisms were counted, or until the entire sample had been sorted. Following sample sorting, all macroinvertebrates were generally identified to the level of taxonomic resolution recommended for Level 2 macroinvertebrate assessments by the Pacific Northwest Aquatic Monitoring Partnership (2015). Cole Ecological,Inc. 8 2018 Clackamas Co.MS4 Macroinvertebrates DATA ANALYSIS A number of standard analytical approaches exist for assessing the condition of macroinvertebrate communities in western Oregon. These approaches can be broadly classified as multimetric indexes and predictive models. Existing tools for analysis of macroinvertebrate data in western Oregon have been developed from, and therefore are only appropriate for, assessment of assemblages collected from coarse substrates (gravels and cobble) in riffle habitat. Consequently, the use of existing bioassessment tools and their attendant condition thresholds is inappropriate for assessing the condition of benthic communities from low-gradient (generally <1-1.5% slope) streams dominated by fine substrates and glide/pool habitat. Analysis of glide samples collected from these streams with existing bioassessment tools would result in artificially lower index scores and classification of condition. In the present study, five of the twenty-two sample sites supported only glide habitat and fine substrates, a condition likely naturally occurring in each system. Accordingly, these five sites were not assigned condition classifications following data analysis. MULTIMETRIC INDEX ANALYSIS Multimetric analysis employs a set of metrics, each of which describes an attribute of the macroinvertebrate community that has been shown to be responsive to one or more types of pollution or habitat degradation. Each community metric is converted to a standardized score; standardized scores of all metrics are then summed to produce a single multimetric score that is an index of overall biological integrity. Metric sets and standardized metric scoring criteria are developed and calibrated for specific stream types and geographic locales. The DEQ has developed and currently employs a 10-metric set for use with riffle samples from higher-gradient streams in western Oregon (WQIW 1999). Owing to the lack of reference conditions for low-gradient, glide-dominated valley-floor streams, no multimetric index currently exists for such stream types in this region. The DEQ 10-metric set includes six positive metrics that score higher with improved biological conditions, and four negative metrics that score lower with improved conditions (Table 3). Mayflies (order Ephemeroptera), stoneflies (order Plecoptera), and caddisflies (order Trichoptera) are widely regarded among the aquatic insect orders as the most sensitive to water pollution and habitat degradation; accordingly, three metrics in the index summarize taxonomic richness within these three insect orders. These three orders of insects are collectively referred to as the "EPT" taxa, derived from the first letter in each of the order names. Cole Ecological,Inc. 9 2018 Clackamas Co.MS4 Macroinvertebrates Table 3. Multi-metric set and scoring criteria(WQIW 1999)used to assess the condition of macroinvertebrate communities from Clackamas County streams in fall 2018. Scoring Criteria Metric . 3 1 POSITIVE METRICS Taxa richness >35 19-35 <19 Mayfly richness >8 4-8 <4 Stonefly richness >5 3-5 <3 Caddisfly richness >8 4-8 <4 Number sensitive taxa >4 2-4 <2 #Sediment sensitive taxa >2 1 0 NEGATIVE METRICS Modified HBI' <4.0 4.0-5.0 >5.0 %Tolerant taxa <15 15-45 >45 %Sediment tolerant taxa <10 10-25 >25 %Dominant <20 20-40 >40 1 Modified HBI=Modified Hilsenhoff Biotic Index The Modified Hilsenhoff Biotic Index (HBI), originally developed by Hilsenhoff (1982), computes an index to organic enrichment pollution based on the relative abundance of various taxa at a reach. Values of the index range from 1 to 10; higher scores are interpreted as an indication of a macroinvertebrate community more tolerant to fluctuations in water temperature, fine sediment inputs, and organic enrichment. Sensitive taxa are those that are intolerant of warm water temperatures, high sediment loads, and organic enrichment; tolerant taxa are adapted to persist under such adverse conditions. The DEQ taxa attribute coding system was used to assign these classifications to taxa in the data set (DEQ, unpublished information). Metric values first were calculated for each riffle sample and then were converted to standardized scores using DEQ scoring criteria for riffle samples from western Oregon streams (Table 3). The standardized scores were summed to produce a multimetric score ranging between 10 and 50. Reaches were then assigned a level of impairment based on these total scores (Table 4). PREDATOR MWCF MODEL PREDATOR is a predictive model that evaluates macroinvertebrate community conditions based on a comparison of observed (0) to expected (E) taxa (Hawkins et al. 2000, Hubler 2008). The observed taxa are those that occurred at the reach, whereas the expected taxa are those expected to occur (>50% probability of occurrence) in the reach in the absence of disturbance. Biological condition is determined by comparing the O/E score at the test site to the distribution of reference reach O/E scores in the model. One Cole Ecological,Inc. 10 2018 Clackamas Co.MS4 Macroinvertebrates major strength of PREDATOR over the multimetric approach is that a single predictive model can be constructed to assess biological conditions over a wide range of environmental gradients such as stream slope, longitude, or elevation, whereas separate multimetric tools would have to be developed to make accurately assess condition. PREDATOR is able to predict taxonomic composition across a range of naturally occurring environmental gradients with discriminant functions models (DFMs). Discriminant functions analysis is used during the model building phase to identify the environmental variables that are statistically related to natural gradients in macroinvertebrate community composition (Hawkins et al. 2000). These "predictor variables" are used in the resulting model to predict macroinvertebrate community composition in the absence of disturbance. The model assigns a probability of class membership of each test site to the different classes of test sites specified in the model based on the environmental predictor variables that are input into the model. Table 4. Multimetric score ranges for assignment of macroinvertebrate community condition levels (WQIW 1999). Level of Impairment Score Range(scale of 10-50) None >39 Slight 30-39 Moderate 20-29 Severe <20 Several geographically specific PREDATOR models are currently in use in Oregon. The Marine Western Coastal Forest (MWCF) model includes the Willamette Valley and lower western foothills of the Cascades. Accordingly, this model was used for the present study. Predictor variables and taxonomic data were input into the model, which calculated the probability of occurrence of each taxon at each study site (in the absence of disturbance). With this information, the model calculates the O/E score for each site. Using the MWCF biological condition thresholds (Hubler 2008), higher-gradient streams with O/E scores <0.85 (<10th percentile of reference site scores) were classified as "most disturbed," 0.86 to 0.91 (>10th to 25th percentile) as "moderately disturbed," and 0.92 to 1.24 (25th to 95th percentile) as "least disturbed." STRESSOR MODELS Weighted-average (WA) inference models were developed by DEQ (Huff et al. 2006) to reveal shifts in macroinvertebrate assemblage composition that implicate either substrate degradation (i.e. fine sediment pollution) or temperature pollution. These WA Cole Ecological,Inc. 11 2018 Clackamas Co.MS4 Macroinvertebrates inference models for temperature and sediment are to be used as screening tools to assist with detecting the source(s) of stress to biological communities in wadeable Oregon streams. Inferred values at a test site are compared to conditions observed at regional reference sites to determine if there is a difference in assemblage-level preferences for temperature or fine sediment(Huff et al. 2006). The 75th percentile of the distribution of inferred temperature and fine-sediment values from regional reference sites is used to determine whether a particular site is potentially stressed by one or both of these attributes. In the analysis for this study, temperature stress and fine-sediment stress weighted- average inference models were first run to derive estimates of inferred water temperatures (temperature scores, or TS) and sediment levels (fine sediment scores, or FSS) in each study reach. Both temperature and fine-sediment models were applied to riffle data, while only the temperature model was applied to glide data. Glide data were not run through the fine-sediment model because fine sediment levels would be expected to differ significantly between the higher- and lower-gradient reach types. For riffle samples, DEQ's thresholds of 18.4°C for temperature and 19% of fine sediment (90th percentile of the distribution of DEQ Willamette Valley reference site scores) were used to determine whether each was a potential stressor in each sample reach (Huff et al. 2006). In lower- gradient reaches that supported only glide and pool habitats, only the temperature stress threshold was applied(DEQ, unpublished data). Cole Ecological,Inc. 12 2018 Clackamas Co.MS4 Macroinvertebrates RESULTS ENVIRONMENTAL CONDITIONS LAKE OSWEGO STREAM REACHES Land use adjacent to the ten previously assessed Lake Oswego study reaches did not change significantly from 2013 to 2018. Study reaches primarily occurred in areas dominated by moderate density residential land use within Lake Oswego's city limits. Reaches represented a range of stream channel and riparian conditions (Table 5). Across most sites, stream habitat was co-dominated by riffle and pool habitats; riffle habitat averaged 40% across all study reaches, while pool habitat averaged 44% (Table 5). Carter (8% riffle habitat), Tryon (20%), and West Lost Dog (22% riffle habitat) creeks supported the lowest frequency of riffle habitat among the Lake Oswego sample reaches. In 2013 and 2018, riffle habitat in Carter Creek was limited to a short section in the middle of the reach that contained cobble-sized fill material used to bury a water or sewer line. Because no naturally occurring riffle habitat was identified in this section of Carter, only a glide sample was collected from this reach in both 2013 and 2018. Streambed substrate within sampled habitat units in the Lake Oswego study reaches primarily comprised coarse materials, which represented an average of 93% of streambed material across all ten study reaches (Table 5 and Figure 2). Sand and fines represented an average of 5% of bed materials in sampled habitat units across the ten reaches. Substrate embeddedness derived from pebble counts averaged 27% and ranged from 15.6% to 58% across the Lake Oswego study reaches. Carter Creek again had the highest reach-wide substrate embeddedness of 58% in 2018. Forested riparian zone widths are generally narrow across the Lake Oswego study reaches, as buffer widths ranged from 10 to 110 m and averaged 43 m. Mature forested riparian zones occurred along most Lake Oswego study reaches (excluding Carter Creek), providing overhead cover ranging from 69 to 97%. Carter Creek, where sampled, flows through a reed-canary-grass-dominated meadow which provided 31% overhead cover (28% in 2013, 38% in 2009 and 27% in 2007). Riparian conditions in the Springbrook Creek restoration reach continue to improve as a result of willow plantings in the early 2000s. Willows in the riparian area of the Springbrook Creek restoration reach have continued to provide excellent canopy cover. Overhead cover in 2018 was measured at 90%, as compared to 93% in 2013, 80% in 2009, 55% in 2007. Cole Ecological,Inc. 13 2018 Clackamas Co.MS4 Macroinvertebrates Table 5. Environmental conditions measured in 22 Clackamas County MS4 co-permittee stream reaches sampled for macroinvertebrates in fall 2018. Other Co-Permittees(n= 12) Lake Oswego(n= 10) Variable Mean SD Min Max Mean SD Min Max Gradient 1.0 1.8 0.0 6.4 2.6 2.7 0.3 9.6 Wetted width(m) 1.7 1.1 0.5 4.9 2.1 1.3 0.8 5.0 Bankfull width(m) 3.5 2.0 1.9 9.1 4.3 3.4 1.6 12.3 %Pool 52.7 25.8 25.0 100.0 44.2 21.8 14.7 83.3 %Glide 19.7 27.1 0.0 75.0 14.4 11.4 0.0 32.0 %Riffle 25.8 26.1 0.0 72.2 39.7 19.6 7.7 70.3 %Rapid/Cascade 2.7 9.2 0.0 32.0 1.7 3.6 0.0 9.2 %Embeddedness(Reach Vis Est) 72.4 26.5 27.2 100.0 52.4 17.2 36.6 92.3 %Eroding Banks 64.1 35.5 0.0 100.0 62.1 34.5 0.0 100.0 %Undercut Banks 6.0 12.1 0.0 41.7 4.7 9.9 0.0 32.1 %Coarse substrate 64.8 42.5 0.0 99.1 93.1 13.1 60.0 100.0 %Sand and fines 32.4 40.5 0.0 95.0 5.2 12.6 0.0 40.0 %Hardpan 0.7 1.7 0.0 5.0 1.7 3.2 0.0 10.0 Embeddedness(Pebble Count) 48.3 38.0 12.5 99.5 26.9 12.0 15.6 58.0 LWD rating 5.4 6.4 0.0 19.6 7.5 7.2 0.0 15.8 Overhead Cover 73.3 27.9 21.1 98.5 83.6 20.1 30.9 97.4 Riparian Buffer Width(m) 29.2 25.7 1.0 70.0 42.8 33.1 10.0 110.0 %Tree Cover 44.0 26.6 5.0 85.0 64.1 20.7 12.5 85.0 %Non-Native Veg 29.9 19.9 0.0 60.0 34.1 23.1 3.8 80.0 Water Temperature(°C) 14.7 2.2 12.0 18.9 15.3 2.6 12.2 21.7 Dissolved Oxygen(%sat) 68.3 31.6 5.7 96.7 83.8 19.2 36.2 98.9 Dissolved Oxygen(mg/L) 7.0 3.4 0.5 10.2 8.4 2.0 3.6 10.6 Conductivity(µS/cm) 132.8 46.2 60.0 203.0 119.6 36.5 60.0 182.0 Specific Conductance(µS/cm) 164.1 51.6 76.0 230.0 147.1 44.0 72.0 218.0 pH 6.9 0.3 6.3 7.3 7.1 0.4 6.3 7.6 Limited water quality sampling during macroinvertebrate sampling in 2018 suggested potential low dissolved oxygen issues in several Lake Oswego stream reaches. While dissolved oxygen concentrations exceeded 8 mg/L in most reaches (measurements taken at various times of the day and not necessarily during peak stress early AM hours), Carter Creek dissolved oxygen was 3.6 mg/L (collected at 920), the lowest among Lake Oswego study reaches, suggesting likely periodic low-DO-induced stress in this reach. Morning dissolved oxygen in the West Branch of Lost Dog Creek was 6.4 mg/L at 930, also suggesting periodically low DO conditions in this reach. CO-PERMITTEE STREAM REACHES Land use adjacent to the twelve co-permittee reaches was variable, ranging from moderate density residential to commercial/industrial. All streams were smaller first or second-order tributaries; bankfull widths averaged 3.5 m and ranged from 1.9 to 9.1 m, while wetted channel widths averaged 1.7 m and ranged from 0.5 to 4.9 m (Table 5). Cole Ecological,Inc. 14 2018 Clackamas Co.MS4 Macroinvertebrates Riffle habitat ranged from 0 to 72%. Eight of twelve reaches supported sufficient riffle area to sample macroinvertebrates from this habitat type; among the twelve reaches, riffle habitat was absent from the Rinearson and both Boardman creek reaches, while the River Forest reach supported only 3%riffle habitat. Streambed Substrate �%Coarse Substrate ■%Sand&Fines ®%Hardpan 100 • 90 - - 80 - - c 70 - 60 - - V 50 - a 40 • 30 - - m 20 10 44 �C ti�4�4;��1 co �ezP' °`� {�� Sez`�peg* Gi&{ez*�aao P5� g <61 S° 4 0 0 0 G G G G O G k G G4c& env° � set � eg' °{c` �c� S¢S� 6 a� �� e� t °� °4° '�`�' 4° 00 G �G G���¢° < a°S o o ��� v �4°`� Oros �`� `SC1 bccv • 54 Other Co-Permittees Lake Oswego Substrate Embeddedness too - - — - - 90 - 80 - b 70 - m 60 - — W 50 - d 40 - Y 30 - 20 - - 10 - I—I �4c�S ,t �4 °¢`b �e16 ��be �� �� Gtb �� °�Ogt �� ° ° �5 �4 4 ' 4 G{ G{ G{ G G: z' �Gp6 0/0 1O,q0 e�°�e�OGSee�,yy,cc� °� Other Co-Permittees Lake Oswego Figure 2. Substrate composition and embeddedness from pebble counts (or visual estimates where pebble counts were precluded)performed in 22 Clackamas County MS4 co-permittee streams sampled for determining conditions of macroinvertebrate communities in September 2018. Cole Ecological,Inc. 15 2018 Clackamas Co.MS4 Macroinvertebrates Riffles from the eight riffle-sampled reaches were dominated by coarse materials (Figure 2). In contrast, glides sampled in Rinearson, Boardman, and River Forest creeks lacked substrates larger than fine gravels and were heavily dominated by sand and fines (Figure 2). Reach-wide embeddedness varied among sites, but was generally high, ranging from 27% to 100% (Table 5). Substrate embeddedness in riffles sampled for macroinvertebrates (in 8 reaches)ranged from 13 to 37% (Figure 2). Riparian buffer widths were generally narrow among the 12 co-permittee reaches, averaging 29 m and ranging from 1 to 70 m. Overhead canopy cover averaged 73% among the 12 co-permittee reaches, and ranged from 21% at the upper Boardman Creek reach to 99% at the River Forest Creek reach. Overhead cover improved from 6% to 46% along the Minthorn Creek; however, this improved shade condition results from the heavy growth Himalayan blackberry and canary reed grass along the reach. Riparian tree cover was again lacking along both the Minthorn Creek (5% tree cover) and Rinearson Creek reaches (25% tree cover). Each of the Boardman Creek reach also lacked riparian tree cover, averaging 20% and 8% cover in the restoration and upper Boardman Creek reaches, respectively. Dissolved oxygen concentrations were sufficiently low to be a significant stress to macroinvertebrate communities in the River Forest Creek reach (2.2 mg/L) and in both Boardman Creek reaches (3.0 and 0.5 mg/L). Water quality sampling once again indicated potential low dissolved oxygen problems in Minthorn Creek (6.4 mg/L @ 1400), and DO in the middle Boeckman Creek and the Rinearson Creek reaches only slightly exceeded 7 mg/L in the early afternoon. The results suggest potentially low AM dissolved oxygen in these three reaches, as well. Dissolved oxygen concentrations from the other six reaches approached or exceeded 9 mg/L. MACROINVERTEBRATE COMMUNITY CONDITIONS LAKE OSWEGO STREAM REACHES Multimetric Index (MMI) scores and PREDATOR MWCF O/E scores indicated that biological conditions are generally similar to those measured in 2013 (Table 6, Table 7, and Figure 3). MMI scores ranged among the ten Lake Oswego reaches from 14 to 22, and eight of the ten sites scored lower than 20, corresponding to "severely disturbed" biological conditions. Only the Nettle Creek reach (MMI score = 20) and the Tryon Creek reach (MMI score =22) scored outside of the "severely disturbed" range, and only marginally. 2018 MMI scores were within 2 points of 2013 MMI scores at nine of ten the Lake Oswego reaches, suggesting no notable change in biological conditions. Lake Oswego PREDATOR O/E scores ranged from 0.243 to 0.583, occurring exclusively in the "most disturbed" condition class. Comparison of 2018 O/E scores with 2013 O/E scores also suggest very similar conditions between the two sampling years (Table 7). Cole Ecological,Inc. 16 2018 Clackamas Co.MS4 Macroinvertebrates Table 6. Summary of Multimetric Index (MMI) scores, PREDATOR MWCF model O/E scores, and temperature (TS) and fine sediment (FSS) stressor model scores calculated from macroinvertebrate samples collected from 22 Clackamas County MS4 co-permittee streams in September 2018. Highlighted TS and FSS scores indicate values that exceed DEQ inferred stressor thresholds of 18.4°C and 19% fine sediment. Asterisk(*) indicates Oak Lodge reach scores from 2012 (rather than 2013). 2013 2018 2013 2018 2018 Habitat MMI MMI 2018 Dist. MWCF MWCF Dist. 2018 2018 Waterbody Sampled Score Score Class Score Score Class TS FSS Boardman Creek REST Glide 16 NA 0.194* 0.194 NA 24.6 Poor 76.4 NA Boardman Creek UPPER Glide 10 NA 0.242* 0.194 NA 22.8 Poor 45.6 NA Boeckman Creek REST Riffle 20 18 Severe 0.388 0.437 Most 22.1 Poor 25.3 Poor Boeckman Creek MID Riffle 16 Severe 0.583 Most 23.4 Poor 42.4 Poor Boeckman Creek UPPER Riffle 14 Severe 0.583 Most 18.8 Poor 29.3 Poor Coffee Creek Riffle 36 30 Slight/Mod 0.63 0.485 Most 16.7 Good 28.8 Poor Minthorn Creek Riffle 16 12 Severe 0.388 0.194 Most 19.7 Poor 62.6 Poor Rinearson Creek Glide 14 12 NA 0.242 0.291 NA 20.5 Poor 55.4 NA River Forest Creek Glide 16 NA 0.145* 0.194 NA 20.7 Poor 68.2 NA Singer Creek Riffle 30 38 Slight 0.581 0.776 Most 16.5 Good 17.6 Fair Tanner Creek Riffle 18 16 Severe 0.242 0.388 Most 16.8 Good 22.3 Poor Trillium Creek Riffle 20 18 Severe 0.485 0.485 Most 22.1 Poor 30.3 Poor Ball Creek Riffle 18 18 Severe 0.437 0.389 Most 19.4 Poor 29.8 Poor Carter Creek Glide 16 18 NA 0.388 0.292 NA 20.8 Poor 42.4 NA Lost Dog Creek Riffle 16 14 Severe 0.291 0.243 Most 16.9 Good 25.7 Poor Lost Dog Creek EAST Riffle 18 18 Severe 0.436 0.340 Most 17.0 Good 36.8 Poor Lost Dog Creek WEST Riffle 10 18 Severe 0.242 0.291 Most 17.9 Good 29.9 Poor Nettle Creek Riffle 18 20 Severe/Mod 0.339 0.437 Most 17.3 Good 25.1 Poor Oswego Creek Riffle 14 16 Severe 0.194 0.291 Most 25.9 Poor 44.8 Poor Springbrook Creek REST Riffle 20 18 Severe 0.388 0.583 Most 21.7 Poor 35.8 Poor Springbrook Creek LOWER Riffle 16 18 Severe 0.437 0.486 Most 22.1 Poor 30.2 Poor Tryon Creek Riffle 24 22 Moderate 0.485 0.388 Most 23.0 Poor 18.6 Fair Among the Lake Oswego streams reaches, EPT (mayfly, stonefly, and caddisfly) richness was highest in Nettle and Tryon creeks (8 EPT taxa each), followed closely by both Springbrook Creek reaches (6 EPT taxa each). A higher EPT richness generally suggests a less disturbed biological condition. The Nettle Creek sample included three mayfly taxa, two stonefly taxa, and three caddisfly taxa. Two of these eight taxa - the mayfly Cinygma sp. and the caddisfly Parapsyche elsis - are classified as "sensitive" to Cole Ecological,Inc. 17 2018 Clackamas Co.MS4 Macroinvertebrates disturbance. Both Springbrook Creek reaches also support the mayfly Cinygma sp.; no taxa classified as sensitive to disturbance were sampled from any of the other eight Lake Oswego sample reaches. Temperature stressor (TS) scores indicate that compositional shifts in macroinvertebrate communities have occurred in response to elevated water temperature in six of the ten Lake Oswego stream reaches (Table 6). Only lower the Lost Dog Creek, East Lost Dog Creek, West Lost Dog, and Nettle Creek reaches appear to support macroinvertebrate communities likely unaffected by elevated water temperatures. Among those six reaches indicating temperature-induced stress, Oswego Creek's community showed the largest shifts in community composition likely induced by temperature, as the inferred temperature score was 25.9°C, almost 3°C higher than the second highest TSS score (Table 6). Fine sediment stressor (FSS) scores from eight of nine Lake Oswego samples collected from riffle habitats (i.e., all reaches other than Carter Creek and Tryon Creek) indicated likely sediment-induced stress on macroinvertebrate communities in these reaches. All eight samples exceeded the threshold FSS score of 19. Tryon Creek's sediment stressor score of 18.6 received a "fair" condition classification, indicating potential, but not likely, sediment induced stress (Table 6). Table 7. Multimetric Index scores and PREDATOR MWCF model O/E scores from stream reaches sampled in and adjacent to the City of Lake Oswego, Oregon, fall 2004, 2007, 2009, 2013, and 2018. DEQ Multimetric Index Scores PREDATOR O/E Scores 13- Sample Site 2004 2007 2009 2013 2018 18 2004 2007 2009 2013 2018 13-18 Ball Creek 20 12 12 18 18 0 0.243 0.339 0.243 0.437 0.389 -0.048 Carter Creek 16 14 16 18 2 0.388 0.388 0.388 0.292 -0.096 Lost Dog Creek 18 16 16 16 14 -2 0.242 0.291 0.339 0.291 0.243 -0.048 Lost Dog Creek East 16 18 18 18 0 0.291 0.436 0.436 0.340 -0.096 Lost Dog Creek West 14 10 10 18 8 0.242 0.194 0.232 0.291 0.059 Nettle Creek 18 14 12 18 20 2 0.436 0.533 0.388 0.339 0.437 0.098 Oswego Creek 18 12 14 16 2 0.436 0.194 0.194 0.291 0.097 Springbrook Crk Lower 14 12 10 16 18 2 0.242 0.388 0.339 0.388 0.583 0.195 Springbrook Crk Rest 16 14 12 20 18 -2 0.339 0.436 0.291 0.437 0.486 0.049 Tryon Creek 14 18 24 22 -2 0.532 0.388 0.485 0.388 -0.097 Cole Ecological,Inc. 18 2018 Clackamas Co.MS4 Macroinvertebrates 2018 MMI Scores 40 - 35 - 0 25 - u 20 15 - - 10 - - 5 - egg 6* 4' * v ° a{r5` het vt�, ��� �° Gibc.i S�'���tie ��°Gs�v e,�" °4 �' �fi .� Gc5P `� ` yeti ° °�' °°e`� 2018 MWCF Scores 0.9 - 0.8 - 0.7 - 0.6 - 0 0 v� 0.5 - w - 04 - - 0.3 - 0.2 - - - - - 0.1 - A4 4�', 4 G G G C.ic G Cis G G \p, G ce* e G� 6* e��°to t� �5� � ,e��� ' �titi et9 Cc ��,e�6c 410'o C;ee 5���£ °� 4454 � g,Via , �,o\P �4 ••do Other Co-Peruit-tees Lake Oswego Figure 3. Multimetric index(MMI) and Marine Western Coastal Forest (MWCF) PREDATOR model scores calculated from 22 macroinvertebrate samples collected from Clackamas County MS4 co-permittee streams in September 2018. Cole Ecological,Inc. 19 2018 Clackamas Co.MS4 Macroinvertebrates CO-PERMITTEE STREAM REACHES MMI scores ranged from 10 to 38 among the twelve co-permittee reaches (Table 6). Singer Creek received the highest MMI score of 38, corresponding to a slightly disturbed biological condition. Coffee Creek scored a 30, corresponding to slightly/moderately disturbed. The ten other co-permittee reaches received MMI scores ranging only between 10 and 18, indicative of severely disturbed biological conditions (Table 6). PREDATOR MWCF O/E scores ranged from 0.194 to 0.776, exclusively within the "most disturbed" condition class among the twelve co-permittee reaches (Table 6). MMI and O/E scores from Rinearson Creek, Boardman Creek, and River Forest Creek were not assigned condition classes because only glides were sampled from these reaches. Among the twelve co-permittee reaches, macroinvertebrate total taxa richness was highest in Singer Creek, where 35 taxa were sampled (Figure 4). This richness included 12 EPT taxa (mayfly, stonefly, and caddisfly), the highest EPT richness among all 22 reaches sampled in this study. Singer Creek's EPT richness included four taxa classified as sensitive to disturbance and water pollution, including the mayfly Cinygma sp., the stonefly Despaxia augusta, the caddisfly Rhyacophila grandis Gr., and dipteran Glutops sp. Furthermore, Singer Creek's modified HBI score and percent tolerant individuals were the lowest among all 22 study sites (Figure 4), indicating the most disturbance- sensitive macroinvertebrate community among all reaches sampled. Across the 22 study reaches, Singer Creek presently supports the most sensitive and diverse macroinvertebrate community. Coffee Creek, the only other reach to receive an MMI score corresponding to only slightly disturbed, supported 25 total macroinvertebrate taxa. Nine EPT taxa were sampled from the Coffee Creek reach, including two taxa classified as sensitive to disturbance: the mayfly Cinygma sp. and the caddisfly Rhyacophila grandis Gr. (Figure 4). Among the 22 sampled study reaches, Coffee Creek macroinvertebrate community scored better than 20 other reaches. Across the co-permittee reaches from which riffles were sampled, Minthorn Creek received the lowest MMI score and MWCF O/E score (Table 6). Only one EPT taxon was sampled in this reach, the generally tolerant Baetis tricaudatus complex, and only one individual was sampled. Minthorn Creek also received the highest HBI score (Figure 5) among all study reaches within which riffles were sampled, indicative of a benthic community that is generally tolerant to organic enrichment pollution. Riffles were nearly absent from the Rinearson reach, both Boardman reaches, and the River Forest reach, necessitating sampling macroinvertebrates from sand-dominated glide habitat. As such, biological condition classes were not assigned from the community scores calculated for these reaches. However, the very low MMI and O/E scores derived from these samples suggest degraded conditions in these reaches, and as Cole Ecological,Inc. 20 2018 Clackamas Co.MS4 Macroinvertebrates further evidenced by the paucity of EPT taxa. Among these four reaches, only two EPT taxa were sampled: one caddisfly taxon from Rinearson Creek and one mayfly taxon from the Boardman Creek restoration reach (Figure 4). The upper Boardman Creek sample supported the lowest total taxa richness among all 22 study reaches (Figure 4). Total taxa richness Caddisfly taxa 35- - 10- 9- 30- 8- A 25- - - - -- m 7- Zr- 0 20- - - - 0 8- - 5- 2 15 _ - --_ .0 4_ - 3- ZZ 2- - - - ---- - U- 0_n n n 4 eeV-e8k-el',;`y-C eev. -.33C OQ-eeW yC‹,-,;se4,-,z,i v,,,i ,k-aav-oes,v gee e'1 P54 a6-6-4s4-16 �t5Q<,q—C�`p�Q-e&6--..1 Rek-sae sae* aGac 4 e-4 eG°0-\,o G� at-JQ v-�e0 J oe,o o Oie�Ge�6 to` a›Gee o°av-e.e 0°e\,oc 6-1-`e v'o", em 6c o G`Gm Ge F OGeL��Qot ocoe op°G��eak-(N G0 i G4?Gta G°c aeoe��c,e,os.o OG,doSdede0Oy kGG`0v--0 c e'toe d c'e c°$cti•°eo<k6yc ackco �o0%oQ O o4 G eo G o Fa G �y..� cAo° o v- a c�'cca o o .t.V..a ,to.0 0'0o o 1_ �a�.,,s,�ov-Fa° FQsr, o4,,,C) �°° A aFacF"zc a Q� 44 0 0 yQ Mayfly taxa Sensitive taxa 10- 5- 9- m 8- m 4- - ,R2 G 6 3 5- 43 - 4- - .0 2- - - 7 E Z1-Il ■i6i ■ nn n zo a0aev-dav-` 6,,pet �aev- _4q-9�R,kc-zev-e1e16 1k-1a1eev ,°ecee-,°0`'„`'seeceeto`'S,,,t,e°� ,`'QF.�F`'��Q4�eece°�°e-,ee,ze-,e°�eev- G�d d<<;* Gc Gc.2-0 Gs Qt'QQ Q�0-Q4 Gc G�040,G�,G�G� a�GOG�04�5�eG �Q-p ,FQ-JQ�Q- JQ eG G 6`G�G�G G OGeteptege etze0°see0Z Gseee odzsze$aroaiy°dey�9a�e: 0G40,Vb G�ote��o eols,ce G40e G a G�Go°,Soo e`44a4,0' �.°50 G �Gy'f Gc ° G�° a�G� G°�co°e�4 9 C�C soy0`P d4 GoOvc? ec°a+F �S�c�e� oy�Qy fl A�`�o* A aFaO� Fac 4�, e�4G Aso to o'cselo a Q- \,\$, �Qcc% toP, o 0oec7- •.°\.° �Qi444° 0'66 o 0ceo 0Q 0 Stonefly taxa Sediment intolerant taxa 10- 5- 9- a 8- 14 4- �_ x G 5- - 0 3 d 5- 0 .0 4- .0 2- - 7 3- 3 Z 2- Z 1- I 0 ■I I nnn _ 0 ael-oe*el-6C<i'`eev-gifro�t.Q-eel- �ciQ4F4,y�vQt�Foe*oev-oe*ika°v-aev-eav- CPO Sc,4Ceav-e0k-6. .Q-ov- (cOQ4:�c��y)4.e..V4 6'.,,eav-eav- Q,d aka 9° 00po ev'q.`�4ev'�,N2 F P 0 0 J G a�CecG Gv-0�-o v-Q-p G Q-4 Q-, Q G G 0, G G G G.k# Ge,k-* 'elik,.,o1 Gte oG)e G ae° r a'O,.ect i� OGe�<Gfc,es0 e��40°." e's ceoesoec feet�seah4°��i`e�aa°�s�J� °0%,?' p°o09 �a�p�e„_0' G4\�c e' 5`�C•� s'oOoOo °eo,E� aec a��e 4.0c � °y°ems oAOe�o ea<6"c'6- Q• `5"\°e'G •c0'°,o°o o`a ate''0°-°& P \.\, toc,1,Q 0°Ooa0 toe �' QCo 0t, <0 00 Figure 4. Panel 1 of individual community metric values calculated from macroinvertebrate samples collected from 22 Clackamas County MS4 co-permittee streams in September 2018. Cole Ecological,Inc. 21 2018 Clackamas Co.MS4 Macroinvertebrates HBI %Sediment tolerant individuals 10- 100- 9- y 90- 8- 80- d 7- _— N 70- C 6- — —— —— — 60- 0 of 5- — —— — 50- — 4- 0 40_ = 3- a 30- 2- O 20-— —— — 1- d 10- n n n 0 0_ n n nl n r,_ In 64'6' a�- c:'\Q,"-c3� 0<e-2.�'&a,(-e,�-e.�e.E e.�- ezzeeeg `°ze�'zet.3Spk'-ze�- `Nq-`�'� 4Q-ae,hmi`k-ea`�-aaee CceC.e0" ('CPC,"<i&0$4 Gee F*'<e Q'O�QQ CAPCie e0"0"C.e G`G`G`k,P c;G`QUO G` QQQ Q-�'QQ GCG ocoeocoe pa\at`' G�aa�0 0 s�A�aa a��°c `ee 6k.co oe o etc°fit'°ore cAeccO���� �Ga��pese;�eO�aa�es�aAGeO�q�°c GseO�Gec ceaCP c`raa�Q°`0c4 s,e G 5 A G [�05�GCce c Cie G aeCce G �ccaa�F 9`�a.C.` �,o rp,°, o v-G ac G ae 4a G \-t. ec 49,co ��°oo°4. a,��,ac�,�C�,E.�ac �Q•�a 04' 4.°°°o* a 6e06-oeo sac Q.g"a `,°wo O.ecov� 1.'0�oeo0°oe6 yQi��O 0�7,137) �oe� SQQc 0 0 Q e %Tolerant individuals %Dominant(1 taxon) 100- 100- y 90- _ — 90- Q- 80- 80- m 70- t 70- 0 cn 60 ` 60- — c 50- —— _ _ 50- ° 40- — 8 40- — 0 30- — — — ; 320-0- — — — — —— 0 20- — —— 0- 10- 10- — •b e�e�gC SAC Q-a� 9,C��9' p&Q-z�esk e�e�e�a�e� ee*<ee�,`;s94 ee�ae�9�C Fi.eel c.yCkQ- C�p�Q-eeFea`fee`Eaa`Eea`Eae`�ea`E C��G`eG`�t.Pov-��c e ,FQ-JQ�Q/�JQ eGCGCG`e0,00`0G`eG`e p0a.�'o,G�l0-A•V'Co�l-<-oh G v-Q.J,r<2- JQ eC;CeCS'�Ca.Ge�C;C �C oSpC�Ca0��Gee' c iO`cC�a G�C°csr67,F°S�c�ac'C��Jtc pGao�p c,cc,c doe 0 eeA,eev-k c�Gsec� Cs 00:0ceay ` CAae'Cc\o yp°op oo� a�F`����Fa `1o,e \SSPA AO�o�o,F ��a ��°,��ac �`CL" ,,°\,°s Qcc°'c�` �oaoa.�oa°O�eG�' `'°.'° Qi�:cAO po oalp 0° � Scogc 0 0 9 .` 0 0 Figure 5. Panel 2 of individual community metric values calculated from macroinvertebrate samples collected from 22 Clackamas County MS4 co-permittee streams in September 2018. Across the 12 co-permittee reaches, macroinvertebrate community conditions were generally very similar to what they were when last sampled. 2018 MMI scores were within 2 points of 2013 MMI scores in four of seven co-permittee reaches previously sampled in 2013 (Table 6). Singer Creek's MMI score increased from 30 in 2013 to 38 in 2018, while Coffee Creek's score decreased from 36 to 30 from 2013 to 2018. Neither of these score changes resulted in a change in disturbance class. PREDATOR MWCF O/E scores continued to occur exclusively in the "most" disturbed" class across all co-permittee sites. The lower Boeckman Creek restoration reach's 2018 MMI score of 18 was similar to the 2013 score of 20, suggesting similar benthic community conditions. Conditions measured in both 2013 and 2018 are similar to those measured in 2003 in the reach, when the benthic community received an MMI score of 16. Individual community metrics have also been similar across these three sampling years (Table 8). Two Cole Ecological,Inc. 22 2018 Clackamas Co.MS4 Macroinvertebrates Boeckman Creek sites —both located upstream of the lower Boeckman Creek restoration site at Rose Lane — were sampled in 2018 for the first time since 2003. Both of these reaches — Boeckman Creek below Kolbe Lane (MID) and Boeckman Creek at the Boeckman Creek Trail footbridge (UPPER)—also received MMI scores corresponding to severely disturbed conditions in 2018. MMI scores from riffle samples from the upper Boeckman Creek site were similar between 2003 (MMI = 16) and 2018 (MMI = 14), suggesting similarly disturbed conditions in 2003 and 2018. The Boeckman Creek MID site below Kolbe Lane (also known as the upper restoration site) received an MMI score of 18 in 2003 (sampled from a glide) and 16 in 2018 (sampled from a riffle). While different habitat types were sampled in the different years, these results demonstrate generally similar benthic community conditions between 2003 and 2018 in this section of Boeckman Creek. Collectively, these data suggest that benthic biological conditions throughout Boeckman Creek have remained largely unchanged between 2003 and 2018. Table 8. Macroinvertebrate community metrics calculated from samples collected from Boeckman Creek below Rose Lane, Wilsonville, Oregon in 2003, 2013 and again in 2018. Metric 'I 2003 2013 2018 Taxa Richness 17 19 21 Mayfly Richness 2 1 2 Stonefly Richness 0 0 1 Caddisfly Richness 1 2 2 # Sensitive Taxa 1 0 1 # Sediment Sensitive Taxa 0 0 0 Modified HBI 5.5 5.3 5.4 % Tolerant Taxa 25 37 46 % Sediment Tolerant 4 6 5 % Dominant(1 taxon) 40 31 25 MMI Score 16 20 18 The three Boardman and River Forest creek reaches included in the 2018 co- permittees study were last assessed 2012 (Cole and Haxton 2013). Biological conditions, as indicated by MWCF O/E scores and a number of community metrics, appear largely unchanged across these three sites between 2012 and 2018 (Table 9). 2018 MWCF O/E scores are identical or very similar to 2013 scores, total taxa richness is similar, EPT richness is almost identical, and HBI scores are similar(Table 9). While only glides have been sampled from these low-gradient reaches, the poorly performing community metrics, considered together with the low dissolved oxygen concentrations, suggest highly disturbed biological conditions in each of these three reaches. Cole Ecological,Inc. 23 2018 Clackamas Co.MS4 Macroinvertebrates Table 9. Comparison of 2012 versus 2018 PREDATOR MWCF O/E scores and select community metrics calculated from macroinvertebrate samples collected from Boardman and River Forest creeks. MWCF O/E Total EPT Score Richness Richness HBI Habitat Reach Sampled 2012 2018 2012 2018 2012 2018 2012 2018 Boardman Creek REST Glide 0.194 0.194 14 19 0 1 7.2 6.7 Boardman Creek UPPER Glide 0.242 0.194 8 9 0 0 6.7 6.4 River Forest Creek Glide 0.145 0.194 9 12 0 0 7.0 7.4 Mean 0.194 0.194 10.3 13.3 0.0 0.3 7.0 6.8 Temperature stressor (TS) scores indicate temperature-stress-induced shifts in macroinvertebrate communities have likely occurred in nine of the twelve co-permittee reaches (Table 6). Only three reaches — Coffee, Singer, and Tanner — received temperature stress scores lower than the 90th percentile threshold score of 18.4 (Table 6). Fine sediment stressor (FSS) scores indicate FS-induced stress in all seven of the eight co-permittee reaches from which riffle samples were collected(Table 6). Only the Singer Creek benthic community received a fine sediment stressor score below the 90th percentile threshold score of 19%. DISCUSSION Owing to the extent of urban development within the study area, results indicating that biological conditions are severely disturbed in most local streams (Figure 6) are not unexpected. The results of this study are consistent with those of other studies of macroinvertebrate communities in Clackamas County urban/suburban settings. Clackamas Water Environment Services most recently sampled macroinvertebrates in the Mt. Scott and Kellogg Creek drainages in 2017; MMI scores of six riffle samples collected from these two drainages in the 2017 study all received "moderately disturbed" scores ranging from 20 to 28 (Waterways & Cole 2018). In the present study, PREDATOR O/E scores did not correspond as well with MMI scores (r2 = 0.300) as they did in the 2013 coordinated assessment. In both years, condition classes have not aligned well between the two sets of scores (Figure 7). Importantly, DEQ currently uses the PREDATOR models to evaluate biological condition of Oregon's streams; by that measure, all reaches evaluated in this study are Cole Ecological,Inc. 24 2018 Clackamas Co.MS4 Macroinvertebrates deemed to be in a "most disturbed" condition relative to regional reference conditions (Figure 7). However, the MMI scores and corresponding condition classes better and more tangibly reflect and represent the range of conditions that currently exist among these small streams sampled in this study. Higher MMI scores result directly from higher taxonomic richness, including that of generally more sensitive groups such as mayflies, stoneflies, and caddisflies. Recognizing this range of biological conditions across these study reaches is instructive to understanding and setting potential biological recovery targets; the highest quality reaches such as Coffee and Singer Creeks represent locally realistic least- disturbed and therefore potentially best attainable conditions for these small streams in local urban and suburban settings. A closer examination of the drainages supporting these reaches may reveal what physical and chemical conditions are necessary to support these locally least-disturbed biological conditions as measured in Coffee and Singer creeks. Further quantification of potential stressors in these and the other systems, including water temperature regime and diel patterns of dissolved oxygen concentrations during peak-stress periods may further reveal potentially causative agents producing the observed biological conditions. Temperature and fine sediment stressor modelling results suggested nearly ubiquitous fine sediment stress across study reaches, and potential temperature-induced stress in most reaches. Coffee and Singer creeks were once again among the few reaches supporting macroinvertebrate communities not exhibiting temperature-induced compositional shifts. While the dissolved oxygen data collected for this study are of limited use for relating observed biological conditions to environmental gradients, the data nonetheless suggest potential dissolved oxygen issues in several systems, most notably in 2018 in Boardman, Carter, and River Forest creeks. Importantly, dissolved oxygen data were collected at the time of macroinvertebrate sampling from each reach, so times varied across reaches and occurred only in the early AM hours from a handful of reaches. Continuous or synoptic temperature and dissolved oxygen monitoring is recommended from these reaches to produce more robust water quality data sets that would better implicate causes of the measured biological disturbance. Since the first Boeckman Creek macroinvertebrate survey was conducted in 2003, only the restored reach below Rose Lane had been surveyed prior to 2018. Three years following the 2003 assessment, restoration work occurred at both the Rose lane and Kolbe Lane road crossings, where culverts were removed and replaced with bridges. More extensive channel restoration work was performed downstream of the Rose Lane crossing than at the Kolbe Lane crossing. The 2013 sampling in the Rose Lane restoration reach revealed that macroinvertebrate community conditions were similar between the 2003 and 2013 sampling events, suggesting recovery of the community following any short-term disturbance that may have resulted from the culvert replacement Cole Ecological,Inc. 25 2018 Clackamas Co.MS4 Macroinvertebrates work. Results of the 2018 assessment below Rose Lane were also similar to those obtained in 2003 and 2013, suggesting unchanging and consistently degraded macroinvertebrate community conditions. The Boeckman Creek reaches below Kolbe Lane and below the Boeckman Creek trail footbridge were each sampled in 2018 for the first time since 2003. Macroinvertebrate community conditions were found to be similar to those in 2003 in both of these reaches, as well. These results suggest similarly significant and chronically disturbed ecological conditions throughout Boeckman Creek, even in the upstream reaches. Temperature and sediment stressor scores implicate both as likely stressors to macroinvertebrate communities throughout Boeckman Creek. MMI CONDITION CLASS 14 - 12 - 1. y 10 o C. - O I. 6 - Z 4 - 2 - 1 Disturbance Class Figure 6. Distribution of macroinvertebrate community condition classes from 17 Clackamas County MS4 co-permittee streams sampled in September 2018, as determined from multimetric index (MMI) scores. Rinearson, Carter, Boardman, and River Forest creeks are not included in these results, as glides were sampled from each of these reaches, thereby precluding the assignment of condition classes. Recovery of biological communities in these MS4 co-permittee area streams is dependent on identifying and improving stream conditions and functions that are currently impaired. While additional water quality data would further elucidate likely cause-effect relationships, stressor model results, combined with the results of physical habitat assessments, are suggestive of multiple stressors co-occurring in most streams assessed in this study. Urban development results in large impervious surface areas that modify hydrologic patterns, resulting in destabilized streamflows, altered seasonal high and low flows, increased sediment inputs, and modified channel morphology and habitat. Urban stormwater also carries numerous pollutants, some of which can attain toxic concentrations during first-flush storm events. This phenomenon, known as "urban Cole Ecological,Inc. 26 2018 Clackamas Co.MS4 Macroinvertebrates stream syndrome" or "multiple stress syndrome" is well documented among urban streams (Walsh et al. 2005). Mechanisms driving the syndrome are complex and interacting, yet rapid and unabated stormwater delivery into highly physically altered (often channelized) receiving waters is largely the source of the various perturbations observed and measured in this and other regional studies of stream condition. These highly modified hydrologic patterns destabilize streamflows and alter seasonal high and low flows, pollutant concentrations, temperature and dissolved oxygen extremes, sediment inputs, and channel morphology, all which cumulatively degrade biological communities. 1 - 0.9 - Moderately Disturbed 0.8 - Most Disturbed • I I 0.7 - y=0.0129x+0.1857 I I 0.6 Rz=0.3002 • • • lI • 51 0.5 - • O 0.4 • I • • I • 0.3 - • • I I • 0.2 - • I I I I 0.1 - Severe 1 Moderate I Slight -2 3 8 13 18 23 28 33 38 M E Score Figure 7. Relationship between MMI and O/E scores. Among pollutants entering streams through stormwater, pesticides are only starting to receive their deserved attention with respect to understanding effects on the ecology of surface waters. Recent work in Clackamas County, Oregon found that several indicators of macroinvertebrate community condition were strongly negatively correlated with streambed sediment concentrations of the pyrethroid insecticide bifenthrin, now widely used in urban areas (Carpenter et al. 2016). Two streams from the 2018 co-permittees macroinvertebrate study, Lost Dog Creek and Tanner Creek, were implicated by the Carpenter study as having bifenthrin concentrations in streambed sediments that were potentially deleterious to macroinvertebrates (Carpenter et al. 2016). Both Lost Dog Creek and Tanner Creek support an abundance of riffle habitat and course substrate, and neither was implicated by the temperature stressor model as potentially suffering from thermal stress. The relatively intact habitat conditions in these reaches further implicate Cole Ecological,Inc. 27 2018 Clackamas Co.MS4 Macroinvertebrates bifenthrin as potentially deleteriously affecting the benthic communities in lower Lost Dog Creek and Tanner Creek. Carpenter et al.'s work suggests that pesticides carried by stormwater may play an important role in the degradation of aquatic communities in some area streams, but more work is necessary on this front. Continued and expanded pesticides monitoring in Clackamas County and elsewhere could assist with further understanding this emerging issue as it relates to stormwater management and consequences to the biology in receiving waters. While many proximate factors may contribute to the biological disturbances measured in this study, ultimately, causation in most cases can likely be attributed to stormwater. Protection of area streams should focus on minimizing total effective impervious areas and improving stormwater retention and drainage patterns to minimize the hydrologic effects of storm events on stream channel conditions. Certain stormwater mitigation strategies such as artificial wetlands and retention facilities also serve to remove pollutants through physical, chemical, or biological processes. Further development within Clackamas County will necessitate careful attention to these and other measures intended to preserve and enhance stream conditions and functions. As such measures and other restoration activities are undertaken, these data will assist with determining the success of these actions relative to their intended benefits to aquatic life. RECOMMENDATIONS • Continue periodic biological monitoring to produce robust data sets of biological condition status and trends • Establish continuous temperature monitoring(and potentially regular DO monitoring) at water quality/biological monitoring stations. These data will offer better opportunities for identifying potential causative agents in producing observed biological conditions • Further characterize and quantify physical, chemical, and hydrologic conditions in study area drainages to understand potential causes of differences in biological conditions area among streams • Continue and expand local and regional pesticides monitoring through the Clackamas Basin Pesticide Stewardship Partnership and other partnerships to further elucidate the effects of pesticides on aquatic life in area streams. Cole Ecological,Inc. 28 2018 Clackamas Co.MS4 Macroinvertebrates LITERATURE CITED Armantrout,N. B. (Compiler). 1998. Glossary of aquatic habitat inventory terminology. American Fisheries Society, Bethesda, MD. Brown and Caldwell. 2017. Comprehensive Clackamas County NPDES MS4 Stormwater Monitoring Plan. Unpublished report prepared for Clackamas County and NPDES MS4 co-permittees. Clean Water Services. 2000. Tualatin River Basin Rapid Stream Assessment Technique. Unpublished technical report prepared by Clean Water Services, Hillsboro, OR 35 pp. Cole, M. B. 2004. City of Wilsonville 2003 Macroinvertebrate Assessment. Unpublished report prepared for the City of Wilsonville. Cole, M. B. 2014. Clackamas County NPDES MS4 Co-Permittees 2018 Coordinated Macroinvertebrate Assessment. Unpublished report prepared for the Clackamas County Co-Permittees. 47 pp. Cole, M. B., and N. D. Haxton. 2013. 2012 Boardman and River Forest Creeks Benthic Macroinvertebrate Assessment for the Oak Lodge Sanitary District, Clackamas County, Oregon. 15 pp. Cole, M. B., and A. P. Harris. 2004. City of Lake Oswego 2004 Macroinvertebrate Assessment. Unpublished report prepared for the City of Lake Oswego, Oregon. 18 pp. DEQ, 2003. Benthic Macroinvertebrate Protocol for Wadeable Rivers and Streams. Unpublished methods manual. Oregon Department of Environmental Quality, Portland, OR. Hubler, S. 2008. PREDATOR: Development and use of RIVPACS-type macroinvertebrate models to assess the biotic condition of wadeable Oregon streams. Unpublished report prepared by the Oregon Department of Environmental Quality, Watershed Assessment Section. 51 pp. Lemke, J. L., and M. B. Cole. 2007. City of Lake Oswego 2007 Macroinvertebrate Assessment. Unpublished report prepared for the City of Lake Oswego, OR. 30 pp. Lemke, J.L., M.B. Cole, and J Dvorsky. 2012. Assessment of Benthic Macroinvertebrate Communities and Geomorphic Conditions in streams of Clackamas County Service District #1. Unpublished report prepared for Clackamas Water Environment Services, Oregon City, OR. 49 pp. Cole Ecological,Inc. 29 2018 Clackamas Co.MS4 Macroinvertebrates Oregon Department of Fish and Wildlife (ODFW). 2002. Methods for Stream Habitat Surveys. Unpublished technical document by the Oregon Department of Fish and Wildlife, Salem, OR. PNAMP. 2015. Draft Standard Taxonomic Effort for Pacific Northwest Macroinvertebrates. Unpublished file prepared for the Pacific Northwest Aquatic Monitoring Partnership. August 2015. Walsh, C.J., A.H. Roy, J.W. Feminella, P.D. Cottingham, P.M. Groffman, and R.P Morgan II. 2005. The urban stream syndrome: current knowledge and the search for a cure. J. N. Am. Benthol. Soc. 24(3): 706-723 Waterways & Cole. 2018. 2017 Assessment of Benthic Macroinvertebrate Communities and Geomorphic Conditions in streams of Clackamas County Service District #1. Unpublished report prepared for Clackamas Water Environment Services, Oregon City, OR. Cole Ecological,Inc. 30 2018 Clackamas Co.MS4 Macroinvertebrates Appendix 1. Environmental conditions measured from 22 Clackamas County NPDES MS4 co-permittee stream reaches, fall 2018. x x x aoo wx a l, t .x :11 -6 2; o -6 ii U U U U U U 6-0 ao ou ;: U 0 0 a °: U -1n Variable anVDan ,- z O c H f f C.) c , Reach length(m) 76 78 76 37 63 79 68 84 75 86 75 60 102 101 81 36 39 65 75 63 50 74 Wetted width(m) 1.9 1.0 1.1 1.1 0.8 1.8 3.6 2.2 2.1 5.0 4.9 1.2 2.3 1.5 1.7 1.2 0.5 1.3 1.3 1.4 1.6 2.0 Bankfull width(m) 3.9 2.3 3.3 1.6 1.6 3.3 12.3 3.1 3.4 8.7 9.1 3.1 4.0 2.3 4.4 2.4 2.0 1.9 2.2 2.9 3.1 4.3 %Pool 21 83 63 30 68 37 37 38 15 50 100 25 58 92 75 28 59 29 60 32 32 42 %Glide 17 9 0 0 10 8 15 24 32 30 0 75 20 0 10 0 0 71 37 3 10 11 %Riffle 53 8 29 70 22 56 49 38 53 20 0 0 23 8 15 72 41 0 3 65 36 47 %Rapid/Cascade 9 0 8 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 32 0 %Embeddedness(Reach Est) 37 92 51 47 72 48 40 54 41 42 100 100 67 94 80 60 48 100 100 48 27 46 %Eroding Banks 88 21 42 100 88 80 0 85 82 35 50 0 88 100 100 55 55 100 100 70 7 45 %Undercut Banks 0 32 0 3 1 3 0 7 0 0 0 0 11 42 11 0 0 0 0 1 6 0 %Coarse substrate 99 60 100 99 80 98 100 100 96 99 0 0 98 95 82 99 90 30 5 81 98 99 %Sand and fines 1 40 0 0 10 0 0 0 0 1 90 95 0 5 14 1 10 70 90 13 0 1 %Hardpan 0 0 0 1 10 2 0 0 4 0 0 5 0 0 0 0 0 0 0 4 0 0 Embeddedness(Pebble Count) 29 58 28 22 27 30 17 16 21 22 99 100 13 24 21 25 37 99 99 30 14 19 LWD Pieces/100 m 11 0 16 0 2 15 1 15 1 14 9 0 20 3 14 0 0 0 0 5 8 7 Canopy Cover 97 31 90 93 96 92 69 90 91 87 34 21 95 51 97 84 46 74 99 97 97 85 Riparian Buffer Width(m) 65 23 110 18 13 63 63 13 10 53 15 5 58 25 70 60 1 3 7 60 28 20 %Tree Cover 75 13 70 63 80 85 70 55 55 76 20 8 68 28 63 48 5 25 85 45 63 73 %Non-Native Veg 18 80 30 50 38 13 4 15 45 50 3 25 34 58 30 60 45 0 8 45 30 23 WQ Time 740 920 1128 745 930 1435 1345 1240 1045 1005 1410 1510 845 1130 1230 1115 1400 1305 1300 800 1000 800 Water Temperature(oC) 14.4 16.3 14.7 12.2 16.1 14.6 21.7 15.5 14.9 12.4 16.9 18.9 12.8 13.3 13.1 14.0 17.5 16.6 15.0 12.0 13.5 12.8 Dissolved Oxygen(%sat) 93.0 36.2 88.7 84.3 64.7 90.9 93.1 92.9 95.4 98.9 30.7 5.7 85.5 71.3 84.4 96.7 66.5 73.5 21.7 91.4 95.5 96.2 Dissolved Oxygen(mg/L) 9.5 3.6 9.0 9.1 6.4 9.2 8.2 9.3 9.6 10.6 3.0 0.5 9.0 7.5 8.9 10.0 6.4 7.2 2.2 9.8 9.9 10.2 Conductivity(µ S/cm) 141 182 107 114 60 104 151 94 90 153 156 203 159 153 138 60 192 152 131 68 95 87 Specific Conductance(µS/cm) 177 218 133 151 72 130 162 115 112 201 186 230 207 197 179 76 224 181 162 90 124 113 pH 7.6 6.8 7.2 6.9 6.3 7.2 7.1 7.3 7.5 6.6 6.6 7.1 6.9 7.2 6.8 7.2 6.3 6.7 7.3 7.1 7.0 Cole Ecological,Inc. 31 2018 Clackamas Co.MS4 Macroinvertebrates Appendix 2. Western Oregon multimetric index individual metric scores calculated from macroinvertebrate communities sampled from 22 Clackamas County NPDES MS4 co-permittee stream reaches in fall 2018. a x x WEB x `��' c4 a Oa v) P" 5n Q a tu- - � � � ,� U U U 0 a) 0.,) 0.,) I) 0 U ,x ,x , 0) , .x .x , , U U U U U 2 U v N 13 ai°) U U U y i. 00 N . ueU �� U13 U oo i o U a) � www00Cj A A A on on on 1 4 JJJ a) o w �. i O O O rt p p p 2' O O O O '8 O •5 5 0 ,9 = Metric W U a a 3 Z O v� v� v� E-H E-H P1 P1 CG CG Ga U r� in E- H Richness 23 28 13 26 19 26 17 25 25 21 20 20 19 9 21 24 25 25 17 16 12 35 14 22 Mayfly Richness 2 3 0 0 1 3 0 3 3 2 3 1 1 0 2 3 1 4 1 0 0 5 1 3 Stonefly Richness 0 0 0 0 1 2 0 0 0 0 1 1 0 0 1 1 1 3 0 0 0 6 0 0 Caddisfly Richness 1 2 1 2 1 3 2 3 3 3 4 4 0 0 2 2 2 2 0 2 0 6 0 3 Number Sensitive Taxa 0 0 0 0 0 2 0 1 1 0 0 0 0 0 1 1 1 2 0 0 0 4 0 1 #Sediment Sensitive Taxa 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 1 0 2 0 0 Modified HBI1 5.6 6.1 5.4 5.5 6.0 5.8 5.1 5.8 5.4 5.5 4.8 4.8 6.6 6.4 5.4 5.4 5.6 4.5 6.1 6.3 7.4 3.3 6.0 5.3 %Tolerant Taxa 42 25 32 37 30 36 47 51 61 52 86 82 45 161 46 65 65 22 81 92 20 20 30 61 %Sediment Tolerant Taxa 22 3 16 21 14 20 7 23 5 2 3 2 23 68 5 13 46 5 39 61 3 3 15 9 %Dominant 21 53 40 21 30 53 27 18 26 22 34 37 34 58 25 32 35 28 30 60 64 30 26 21 Cole Ecological,Inc. 32 2018 Clackamas Co.MS4 Macroinvertebrates Appendix 3. Reach Assessment Summary Sheets Cole Ecological,Inc. 33 2018 Clackamas Co.MS4 Macroinvertebrates Reach Assessment Summaryol O� Stream Name: Ball CreekdiNAM ECOLOGICAL.!Nc Location: at Kruse Oaks Blvd Latitude: 45.42452 County,State: Clackamas,Oregon Longitude: -122.74031 Date sampled: 9/12/2018 Reach Length: 76 m Personnel: M.Cole &C. Burtch Physical and Chemical Conditions Summary Site Location Instream Physical Characteristics Wetted Width (m) 1.9 1 I I In. _ _,.:, Bankfull Width (m) 3.9 0% 50% 100% =s _� " • Rapids/Cast. 9.2 _ u % Riffles 52.6 o%Rapids/Casc. ❑%Riffles eallCr k ' % Glides/Runs 17.1 •%Glides/Runs ■%Pools . -_ om _` • Pools 21.1 Substrate 1oo.o- "` -t %Wood WD 0.0 80.0 �� � ..•, o31, % Hardpan HP 0.0 :,�., % Fines FN 0.8 60.0- Survey start,facing upstream %Sand SA 0.0 % Fine Gravel GF 13.4 40.0- % Crse Gravel GC 33.6 20.0- U- F w- Cobble CB 42.9 ; '.4 % Bulder BL 9.2 0.0 . #"�� o a z a LL c m cc - ;iii • Bedrock BR 0.0 _ " o cD o m m ' 1 7' • 1-• ,: % Embeddedness 28.8 -..�' ++ LWD (pieces/100 m) 11 Embeddedness 4 i? Eroding Banks (%) 88 - • + . ".f,` �` Undercut Banks (%) 0 _ - + - Riparian Zone Characteristics Survey end,facing downstream Canopy Cover(%) 97 Canopy Cover . . Riparian Buffer Width (m) 65 Rip Zone Tree Cover(%) 75 • • .,i NV 4r, 1111.Rip Non-Native Cover(%) 18 ",. • �•, ,='a r a Chemical Characteristics, •_ - -�; Water Temperature (°C) 14.37 Riparian Buffer Width (m) +� `� r Specific Cond (µS/cm) 177 I I I I0. ■i vir-e Dissolved Oxygen (mg/L) 9.5 1 , - p H 7.63 0 25 50 75 100 • L Time of Measurement 740 CE Sample ID: 18-122-01 Biological Conditions Summary Sample Method:OR 8-kick Target Habitat: Riffle DEQ Metric Scores PREDATOR O/E Score Raw Stand. - 50 Disturbance Richness 23 3 Non-disturbed Year Score Level Mayfly 2 1 40 2013 0.437 Most Stoneflv 0 1 2018 0.389 Most Ca d d i s fl v 1 1 Slightly disturbed #Sensitive Tam 0 1 30 #Sed Sens Taxa 0 1 Modified HBI 5.6 1 Mod disturbed %TolerantTax2 41.9 3 20 2018 Stressor Scores %Sed Tol Taxa 21.6 3 Severely disturbed Temperature Stress: 19.4 % Dominant(1) 21.4 3 10 Fine Sediment Stress: 29.8 TOTAL MMI SCORE • 18 Cole Ecological,Inc. 34 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary ®Co� Stream Name: Carter Creek ECOLOGICAL.tuc. Location: at Bangy Latitude: 45.41703 County,State: Clackamas,Oregon Longitude: -122.74064 Date sampled: 9/12/2018 Reach Length: 78 m Personnel: M.Cole &C. Burtch Physical and Chemical Conditions Summary Site Location Instream Physical Characteristics '--s - ` ti Wetted Width (m) 1.0 k� ,ti --' Bankfull Width (m) 2.3 ��`" '' �� % Rapids/Casc. 0.0 -s r c- ter Creek -' - A % Riffles 7.7 %Rapids/Cast. o%Riffles r -- %Glides/Runs 9.0 ■%Glides/Runs ■%Pools , r .. % Pools 83.3 > 100.0- �Substrate 7� %Wood WD 0.0 % Hardpan HP 0.0 80.0- % Fines FN 20.0 60.0- Surve start,fa cing u•stream %Sand SA 20.0 . % Fine Gravel GF 20.0 40.0 - F %Crse Gravel GC 10.0 20.0 %Cobble CB 30.0 n % Bulder BL 0.0 0.0 0 = LL N CD 0 C mm ' % Bedrock BR 0.0 % Embeddedness 58.0 • 411: LWD (pieces/100 m) 0 Embeddedness Eroding Banks (%) 21 71•''T~•1 r_. Undercut Banks (%) r Riparian Zone Characteristics Surve end,facing downstream Canopy Cover(%) 31 Canopy Cover Riparian Buffer Width (m) 23 -) Rip Zone Tree Cover(%) 13 ' -1-R Rip Non-Native Cover(%) 80 r ' . Chemical Characteristics Water Temperature (°C) 16.28 Riparian Buffer Width (m) ''•� ,-' -.. -. .� Specific Cond (µS/cm) 218 I I I �_�"1. .i .�,r 411 , ..,,'r!'�+_ Dissolved Oxygen (mg/L) 3.55 11 pH 6.78 0 25 50 75 100 Time of Measurement 920 CE Sample ID: 18-122-02 Biological Conditions Summary Sample Method:OR 8-kick Target Habitat: Glide DEQ METRIC SCORES PREDATOR O/E Score Raw Stand 50 Disturbance Richness 28 3 Non-disturbed Year Score Level Mayfly 3 1 40 2013 0.388 NA Stoneflv 0 1 2018 0.292 NA Caddisflv 2 1 Slightly disturbed #Sensitive Taxi- 0 1 30 #Sed Sens Taxa 0 1 Modified HBI 6.1 1 Mod disturbed %Tolerant Ta x2 25.1 3 20 Stressor Scores %Sed Tol Taxa 3.4 5 Severely disturbed Temperature Stress: 20.8 % Dominant(1) 53.1 1 10 Fine Sediment Stress: NA TOTAL MMI SCORE • 18 Cole Ecological,Inc. 35 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary COLE Stream Name: Lost Dog Creek FP]4- bia. Location: at end of Lake Front Dr Latitude: 45.40064 County,State: Clackamas, Oregon Longitude: -122.6891 Date sampled: 9/13/2018 Reach Length: 76 m Personnel: M. Cole &C. Burtch Physical and Chemical Conditions Summary Site Location Instream Physical Characteristics ` , }_.°-- �` xs0 :,-- -,..:F Wetted Width (m) 1.1 "A - 1'-.- IMIMI Bankfull Width (m) 3.3 0% 50% 100% 411,x; �y, % Rapids/Casc. 7.9 % Riffles 28.9 0%Rapids/Casc. o%Riffles -- �'�;� ` 'S y„ •/i o ■%Glides/Runs ■%Pools - r-ry � '1 * �p /D Glides/Runs 0.0 i iv % Pools 63.2 �' = Substrate ioo.o- - .. '. %Wood WD 0.0 4 % Hardpan HP 0.0 80.0 ...,,,„ ..,0w % Fines FN 0.0 60.0- Survey start,facing upstream %Sand SA 0.0 % Fine Gravel GF 8.8 40.0- - ° ' %Crse Gravel GC 30.1 20.0 - CIL-'7`{•• y-ti F.• %Cobble CB 44.2 '�� % Bulder BL 16.8 0.0 . . . .1-1, _. n i,. . };" ..- . tL- !q' • o a Z Q •Bedrock BR 0.0 = L` ° v m m } ` 4' �' ��I % Embeddedness 28.2 - •. • F ;• -' LWD (pieces/100 m) 16 Embeddedness .. Eroding Banks (%) 42 di `Jr Undercut Banks (%) 0 r `' ;114- T '' Riparian Zone Characteristics Survey end,facing downstream Canopy Cover(%) 90 Canopy Cover V� ' "" •Riparian Buffer Width (m) 110 Rip Zone Tree Cover(%) 70 . .'•ff..' T. A Rip Non-Native Cover(%) 30 .= Chemical Characteristics . Water Temperature (°C) 14.7 Riparian Buffer Width (m) c`' • -' •.•P- . Specific Cond (µS/cm) 133 -' - Dissolved Oxygen (mg/L) 8.99 I I I I 1 .t r ,.• ,�_ �• pH 7.24 0 25 50 75 100 ;VIA �� F '''','` z 3 Time of Measurement I 1128 CE Sample ID: 18-122-03 Biological Conditions Summary Sample Method:OR 8-kick Target Habitat: Riffle DEQ METRIC SCORES PREDATOR O/E Score Raw Stand - 50 Disturbance Richness 13 1 Non-disturbed Year Score Level Mayfly 0 1 40 2013 0.291 Most Stoneflv 0 1 2018 0.243 Most Caddisflv 1 1 Slightly disturbed #Sensitive Taxi. 0 1 30 #Sed Sens Tax2 0 1 Modified HBI 5.4 1 Mod disturbed %Tolerant Taxz 32.0 3 20 StressorScores %Sed Tol Taxa 16.1 3 Severely disturbed Temperature Stress: 16.9 % Dominant(1) 40.2 1 Fi ne Sediment Stress: 25.7 TOTAL MMI SCORE 0 14 10 Cole Ecological,Inc. 36 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary COLE Stream Name: Lost Dog Creek EAST ECOLOGICAL,n,a Location: at Stafford Rd (EAST) Latitude: 45.4026 County,State: Clackamas,Oregon Longitude: -122.68057 Date sampled: 9/13/2018 Reach Length: 37 m Personnel: M. Cole &C. Burtch Physical and Chemical Conditions Summary Site Location Instream Physical Characteristics ,-- _u- • d Wetted Width (m) 1.1 Bankfull Width (m) 1.6 0% 50% 100% .t• % Rapids/Casc. 0.0 •••- =• Ep Lost D Creek ` % Riffles 70.3 %Rapids/Casc. o%Riffles "� og %Glides/Runs 0.0 •%Glides/Runs •%Pools . - r4i - �7 Pools 29.7 ` ` '' ' Substrate ioo.o- %Wood WD 0.0 ,s, ' •% Hardpan HP 1.0 80.0 . „ _ • ,i+"+ " % Fines FN 0.0 60.0- Surve start,facin: u•stream %Sand SA 0.0 - -,- - - % Fine Gravel GF 6.7 40.0- - . %Crse Gravel GC 41.3 20.0- J. .1-..' - %Cobble CB 51.0 •''6•• - % Bulder BL 0.0 00 o'Cl- 'Z ¢ ��m� � " ,. • % Bedrock BR 0.0 _ " W 0 C7 " m 00 r� ' Embeddedness 22.3 - 1s LWD (pieces/100 m) 0 Embeddedness • 4• t. - ti .,.r _ Eroding Banks (%) 100 - .04 - _•+~ wi Undercut Banks (%) 3 • .• - "� Riparian Zone Characteristics Survey_end,facing downstream Canopy Cover(%) 93 Canopy Cover 4 - a-it ,,.4, Riparian Buffer Width (m) 18 "I' . - • Rip Zone Tree Cover(%) 63 - ' - Rip Non Native Cover(%) 50 ; �`, t'ill ±r' - G. Chemical Characteristics - Water Temperature (°C) 12.15 Riparian Buffer Width (m) :,-4 _ -�� - , ••.. Specific Cond (µS/cm) 151 II x•-- .,' •,1 •�•.� �c Dissolved Oxygen (mg/L) 9.05 ~ I I 1 1 •- ' •+ ,,• IF r :pr pH 6.92 0 25 50 75 100 ''• . Iv + ••�•.+ Time of Measurement I 745 CE Sample ID: 18-122-04 Biological Conditions Summary Sample Method:OR 8-kick Target Habitat: Riffle DEO METRIC SCORES PREDATOR O/E Score Raw Stand. 50 Disturbance Richness 26 3 Non-disturbed Year Score Level Mayfly 0 1 40 2013 0.436 Most Stoneflv 0 1 2018 0.340 Most Caddisflv 2 1 Slightly disturbed #Sensitive Taxi- 0 1 30 #Sed Sens Taxa 0 1 Modified HBI 5.5 1 Mod disturbed %Tolerant Taxa 37.1 3 20 StressorScores %Sed Tol Taxa 21.3 3 Severely disturbed Temperature Stress: 17.0 % Dominant(1) 20.9 3 10 Fine Sediment Stress: I 36.8 TOTAL MMI SCORE 18 Cole Ecological,Inc. 37 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary ©COLE Stream Name: Lost Dog Creek WEST ECOLO0ICAL.Mc. Location: at Lake Oswego Golf Course (WEST) Latitude: 45.40999 County,State: Clackamas,Oregon Longitude: -122.67819 Date sampled: 9/13/2018 Reach Length: 63 m Personnel: M.Cole &C. Burtch Physical and Chemical Conditions Summary Site Location _ Instream Physical Characteristics Wetted Width (m) 0.8 FliM °__ .- Bankfull Width (m) 1.6 0% 50% 100% �"`! -- ad` s. T 0 V71`�� C7 Cu Dop creek T i /o Rapids/Casc. 0.0 -NW '''r .,� % Riffles 22.2 %Rapids/Casc. 0%Riffles 75 ,� . %Glides/Runs 9.5 ■%Glides/Runs ■%Pools a.+•- s � % Pools 68.3 ft �s , "�'� 1 Substrate loo.o- '` le ` %Wood WD 0.0 } r • • Hardpan HP 10.0 80.0- % Fines FN 10.0 60.0- Survey start,facing upstream r Sand SA 0.0 - - - /° Fine Gravel GF 50.0 %Crse Gravel GC 30.0 40.0- .*-, F' # �• . .rr Cobble CB 0.0 �--�� I 21 +=-:- - ' - glie • Bulder BL 0.0 0.0 _ �.• 4 el o 2 Z < L 0 m m' D_ _+ % Bedrock BR 0.0 0 " CO 1 r. % Embeddedness 27.0 LWD (pieces/100 m) 2 Embeddedness 'An" • ' . Eroding Banks (%) 88 ,• + e 1 Undercut Banks (%) 1 F•" '� - ' I. h r s Riparian Zone Characteristics Surve end,facing downstream. Canopy Cover(%) 96 Canopy Cover ` *. •• • ••• -2] Riparian Buffer Width (m) 13 • ••+'�i _.1. - rU. ;+t Rip Zone Tree Cover(%) 80 ;�. as, _ ' ~ 1: Rip Non-Native Cover(%) 38 _ • -AnM1_14 F ?'• � -." z). .+ti r Chemical Characteristics _ F•, �,• Z; k f Water Temperature (°C) 16.05 Riparian Buffer Width (m) S Y .+d- Specific Cond (µS/cm) 72 I I I q6- Dissolved Oxygen (mg/L) 6.38a. r.p H 6.25 0 25 50 75 100 - ' Time of Measurement 930 CE Sample ID: 18-122-05 Biological Conditions Summary Sample Method:OR 8-kick Target Habitat: Riffle DEQ METRIC SCORES PREDATOR O/E Score Raw Stand. - 50 Disturbance Richness 19 3 Non-disturbed Year Score Level Mayfly 1 1 40 2013 0.242 Most Stoneflv 1 1 2018 0.291 Most Caddisflv 1 1 Slightly disturbed #SensitiveTaxz 0 1 30 #Sed Sens Taxz 0 1 Modified HBI 6.0 1 Moddisturbed %Tolerant Taxz 30.0 3 20 StressorScores %Sed Tol Taxa 14.4 3 T Temperature Stress: 17.9 o 29 6 3 Severely disturbed Fine Sediment Stress: 29.9 /o Dominant(11 TOTAL MMI SCORE • 18 10 Cole Ecological,Inc. 38 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary COLE Stream Name: Nettle Creek I rk 2COLOOIw.L Location: at Atwater Rd Latitude: 45.42461 County,State: Clackamas,Oregon Longitude: -122.68137 Date sampled: 9/12/2018 Reach Length: 79 m Personnel: M.Cole &C. Burtch Physical and Chemical Conditions Summary Site Location Instream Physical Characteristics Wetted Width (m) 1.8 1 I Bankfull Width (m) 3.3 0% 50% 100% % Rapids/Casc. 0.0 / --_ % Riffles 55.7 o%R api ds/Casc. ❑%Riffles s % ■%Glides/Runs ■%Pools s Glides/Runs 7.6 A * - x .;_ • • WN % Pools 36.7 `• Substrate 1oo.o- -r.': .'. 41_ k- %Wood WD 0.0 '' ��' % Hardpan HP 2.3 80.0- �, ;� -, >°��• % Fines FN 0.0 60.0- Survey start,facing upstream %Sand SA 0.0 % Fine Gravel GF 27.3 40.0• ' -_ .: - % Crse Gravel GC 54.5 20.0- k Pw' ' •� % Cobble CB 13.6 % Bulder BL 2.3 0.0 ❑ a z Q ❑ v m ? L •--- % Bedrock BR 0.0 _ " `° 0 CD U m m 3� _ % Embeddedness 29.5 +�� ., +0; ' ,. LWD (pieces/100 m) 15 Embeddedness ' ' •• ;'. : Eroding Banks (%) 80 '"r��` T` iltA- Undercut Banks (%) 3 - Riparian Zone Characteristics Survey end,facing downstream Canopy Cover(%) 92 Canopy Cover , Riparian Buffer Width (m) 63 - - Rip Zone Tree Cover(%) 85 ., • Rip Non-Native Cover(%) 13 . -. I" . Chemical Characteristics .- " ' -• Water Temperature (°C) 14.6 Riparian Buffer Width (m) Specific Cond (µS/cm) 130 II p•. Dissolved Oxygen (mg/L) 9.24 I I 1 _ pH 0 25 50 75 100 Is i j Time of Measurement 1435 CE Sample ID: 18-122-06 Biological Conditions Summary Sample Method:OR 8-kick Target Habitat: Riffle DEQ METRIC SCORES PREDATOR O/E Score Raw Stand. 50 Disturbance Richness 26 3 Non-disturbed Year Score Level Mayfly 3 1 40 2013 0.339 Most Stoneflv 2 1 2018 0.437 Most Caddisflv 3 1 Slightly disturbed #Sensitive Taxi' 2 3 30 #Sed Sens Taxa 1 3 Modified HBI 5.8 1 Moddisturbed %Tolerant Taxa 36.0 3 20 StressorScores %Sed Tol Taxa 20.4 3 Severely disturbed Temperature Stress: 17.3 % Dominant(1) 52.8 1 10 Fine Sediment Stress: 25.1 TOTAL MMI SCORE 0 20 Cole Ecological,Inc. 39 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary CQLE Stream Name: Oswego Creek 1SGDLOCEGAL.Ma Location: George Rogers Park (ds Hwy 43) Latitude: 45.41073 County,State: Clackamas,Oregon Longitude: -122.66248 Date sampled: 9/13/2018 Reach Length: 68 m Personnel: M. Cole &C. Burtch Physical and Chemical Conditions Summary Site Location Instream Physical Characteristics Wetted Width (m) 3.6 11 Bankfull Width (m) 12.3 0% 50% 100% _ x % Rapids/Casc. 0.0 ® ti % Riffles 48.5 o%Rapids/Casc. ❑%Riffles #>SWe O, g C eek % Glides/Runs 14.7 •%Glides/Runs ■%Pools -f % Pools 36.8 w . Substrate 1oo.o- •" Wood WD 0.0 y � `� `} gI % Hardpan HP 0.0 800• % Fines FN 0.0 60.0• Surve start,facin: u'stream ` #%Sand SA 0.0 � ,- ,r Fine Gravel GF 9,1 40.0 •. 4: , % Crse Gravel GC 23.6 20.0• 1. i•- -s - % Cobble CB 58.2 14k - . - % Bulder BL 9.1 0.0 o' a 'z` a u_ v m _, , ifi, •• ,4 Bedrock BR 0.0 _ co m m +7,, y {� #�r % Embeddedness 17.0 ' LWD (pieces/100 m) 1 Embeddedness pill • ' Eroding Banks (%) 0 Undercut Banks (%) 0 �- ' r Riparian Zone Characteristic Survey end,facing downstream Canopy Cover(%) 69 Canopy Cover - - Riparian Buffer Width (m) 63 - 1 • • Rip Zone Tree Cover(%) 70 r - - Rip Non-Native Cover(%) 4 B. y Chemical Characteristics ` r7.010. • - Water Temperature (°C) 21.71 Riparian Buffer Width (m) - � Specific Cond (µS/cm) 162 II + " Dissolved Oxygen (mg/L) 8.19 I I 1 - . - pH 7.19 0 25 50 75 100 ..-. Time of Measurement 1345 CE Sample ID: 18-122-07 Biological Conditions Summary Sample Method:OR 8-kick Target Habitat: Riffle DEQ METRIC SCORES PREDATOR O/E Score Raw Stand. 50 Disturbance Richness 17 1 Non-disturbed Year Score Level Mayfly 0 1 40 2013 0.194 Most Stoneflv 0 1 2018 0.291 Most Caddisflv 2 1 Slightly disturbed #Sensitive Taxi. 0 1 30 #Sed Sens Taxa 0 1 Modified HBI 5.1 1 Mod disturbed %Tolerant Taxa 46.8 1 20 Stressor Scores %Sed Tol Taxa 7.2 5 Severely disturbedTemperature Stress: 25.9 % Dominant(1) 27.3 3 10 Fine Sediment Stress: 44.8 TOTAL MMI SCORE 16 Cole Ecological,Inc. 40 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary CQ LE Stream Name: Springbrook Creek REST AMIE ECOLOGICAL.Mc Location: at Boones Way Latitude: 45.41403 County,State: Clackamas,Oregon Longitude: -122.71512 Date sampled: 9/12/2018 Reach Length: 84 m Personnel: M. Cole &C. Burtch Physical and Chemical Conditions Summary Site Location Instream Physical Characteristics = _ Wetted Width (m) 2.2 - - Bankfull Width (m) 3.1 0% 50% 100`)/0 -! - � • Rapids/Cast. 0.0 % ❑%Raids/Casc. ❑%Riffles -%►�„ as'+ Riffles 38.1 Rapids/Casc. Creek Retiiiton o ■%Glides/Runs ■%Pools i -,..-", /oGlides/Runs 23.8 �; � -- f � � �, �. • Pools 38.1 ,- 4 - s h Substrate 100.0- .�' %Wood WD 0.0 % Hardpan HP 0.0 so.o- !., p a ,ii- .ca081e % Fines FN 0.0 60.0- Survey start,facing upstream � %Sand SA 0.0 % Fine Gravel GF 6.5 40.0- _.1 % Crse Gravel GC 34.6 20.0- % Cobble CB 50.5 i _- % Bulder BL 8.4 00 0' a 'z a LL m .a, '' w % Bedrock BR 0.0 _ " `n 0 0 v LI m I5 . r • r' + {�` lJ % Embeddedness 15.6 z LWD (pieces/100 m) 15 Embeddedness Ilitr_ r+� - ' Eroding Banks (%) 85 a Undercut Banks (%) 7 Ate r xw+ .• Riparian Zone Characteristics Survey end,facing downstream Canopy Cover(%) 90 Canopy Cover i' Riparian Buffer Width (m) 13 II ) Rip Zone Tree Cover(%) 55 I ! ( r. Rip Non-Native Cover(%) 15 ' Chemical Characteristics - ,•+" Water Temperature (°C) 15.47 Riparian Buffer Width (m) •' �� °"'x - Specific Cond (µS/cm) 115 • Dissolved Oxygen (mg/L) 9.27 'Imm. I I 1 I .1. ' pH 7.11 0 25 50 75 100 ` r r Time of Measurement 1240 CE Sample ID: 18-122-08 Biological Conditions Summary Sample Method:OR 8-kick Target Habitat: Riffle DEQ METRIC SCORES PREDATOR O/E Score Raw Stand. 50 Disturbance Richness 25 3 Non-disturbed Year Score Level Mayfly 3 1 40 2013 0.388 Most Stoneflv 0 1 2018 0.583 Most Caddisflv 3 1 Slightly disturbed #Sensitive Taxi. 1 1 30 #Sed Sens Taxa 0 1 Modified HBI 5.8 1 Mod disturbed %Tolerant Taxa 51.0 1 20 StressorScores %Sed Tol Taxa 22.5 3 Severely disturbed Temperature Stress: 21.7 % Dominant(1) 17.9 5 10 Fine Sediment Stress: 35.8 TOTAL MMI SCORE • 18 Cole Ecological,Inc. 41 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary CQLE Stream Name: Springbrook Creek LOWER 1SGDLOCEGAL.Ma Location: at Iron Mtn Park Latitude: 45.41421 County,State: Clackamas,Oregon Longitude: -122.70775 Date sampled: 9/12/2018 Reach Length: 75 m Personnel: M. Cole &C. Burtch Physical and Chemical Conditions Summary Site Location Instream Physical Characteristics I r Wetted Width (m) 2.1 I I _ � #r° Bankfull Width (m) 3.4 0% 50% 100% % Rapids/Casc. 0.0 % Riffles 53.3 O%Rapids/Casc. ❑%Riffles % Glides/Runs 32.0 •%Glides/Runs ■%Pools % Pools 14.7 - Substrate 100.0- %Wood WD 0.0 ar V % Hardpan HP 3.8 800 % Fines FN 0.0 60.0• Surve start,facin: u•stream %Sand SA 0.0 ' % Fine Gravel GF 5.7 40.0- % Crse Gravel GC 51.9 20.0- • • • Cobble CB 38.7 . F. i , % Bulder BL 0.0 0.0 o a z a 0 m :� _ r Bedrock BR 0.0 _ CO CO f2 Embeddedness 20.6 1ills •* LWD (pieces/100 m) 1 Embeddedness �- �` dF� -. • ' +-r - ' Eroding Banks (%) 82 -i Undercut Banks (%) 0 Riparian Zone Characteristics Survey end,facing downstream Canopy Cover(%) 91 Canopy Cover •141.p'ir-- 3,1,„", Riparian Buffer Width (m) 10 - -=r "r' Rip Zone Tree Cover(%) 55 - Rip Non-Native Cover(%) 45 Chemical Characteristics • Water Temperature (°C) 14.94 Riparian Buffer Width (m) . _tie E Specific Cond (µS/cm) 112 ' `. "' ' "t' 'ImmI Dissolved Oxygen (mg/L) 9.63 . I I I - . pH 7.32 0 25 50 75 100 If. i Time of Measurement 1045 CE Sample ID: 18-122-09 Biological Conditions Summary Sample Method:OR 8-kick Target Habitat: Riffle DEQ METRIC SCORES PREDATOR O/E Score Raw Stand. 50 Disturbance Richness 25 3 Non-disturbed Year Score Level Mayfly 3 1 40 2013 0.437 Most Stoneflv 0 1 2018 0.486 Most Caddisflv 3 1 Slightly disturbed #Sensitive Taxz 1 1 30 #Sed Sens Taxa 0 1 Modified HBI 5.4 1 Mod disturbed %Tolerant Taxa 60.6 1 20 Stressor Scores %Sed Tol Taxa 5.1 5 Severely disturbedTemperature Stress: 22.1 % Dominant(1) 26.3 3 10 Fine Sediment Stress: 30.2 TOTAL MMI SCORE 18 Cole Ecological,Inc. 42 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary COLE Stream Name: Tryon Creek Location: at Hwy 43 Latitude: 45.42427 ECOLOGICAL.We. County,State: Clackamas,Oregon Longitude: -122.66125 Date sampled: 9/17/2018 Reach Length: 86 m Personnel: M. Cole &C. Burtch Physical and Chemical Conditions Summary Site Location Instream Physical Characteristics -- -- _- _-- . Wetted Width (m) 5.0 - Bankfull Width (m) 8.7 0% 50% 100% -=Y Rapids/Casc. 0.0 IO . , 1,w°r ,eek % Riffles 19.8 o%Rapids/Casc. o%Riffles .. " % Glides/Runs 30.2 ■%Glides/Runs ■%Pools - J�`e y % Pools 50.0 r <. Substrate 100.0- --_ rN %Wood WD 0.0 al''' % Hardpan HP 0.0 60.0- ID,... ,,., ,,,.,, l % Fines FN 0.0 60.0- Survey start,facin upstream %Sand SA 0.9 F - •� '� % Fine Gravel GF 4.5 40.0- ,' ' % Crse Gravel GC 31.3 200- % Cobble CB 58.0 ti ' '_ ' ' .:, % Bulder BL 5.4 0.0 o.a.Z. Q.� m J .=k i- ,4._iti�s • _ �� Et Bedrock BR 0.0 _ " " " co 00 + . •`. - _ • ip % Embeddedness 22.4 �i_ ••• LWD (pieces/100 m) 14 Embeddedness Z:a ' Eroding Banks (%) 35 ir - . 1141111",:t Undercut Banks (%) 0 } Riparian Zone Characteristics Survey end,facing downstream Canopy Cover(%) 87 Canopy Cover Riparian Buffer Width (m) 53 ' Rip Zone Tree Cover(%) 76 - :: Rip Non-Native Cover(%) 50 s - L Chemical Characteristics 1111. . - Water Temperature (°C) 12.41 Riparian Buffer Width (m) t'•. , -i' - ._ 41 Specific Cond (µS/cm) 201 II , ' Dissolved Oxygen (mg/L) 10.56 : I I I 1 4 - Jr:. .ti pH 7.45 0 • 25 50 75 100 '1 �-. - r- - }, • .. ' Time of Measurement 1005 CE Sample ID: 18-122-11 Biological Conditions Summary Sample Method:OR 8-kick Target Habitat: Riffle DEQ METRIC SCORES PREDATOR O/E Score Raw Stand. 50 Disturbance Richness 20 3 Non-disturbed Year Score Level Mayfly 3 1 40 2013 0.485 Most Stoneflv 1 1 2018 0.388 Most Caddisflv 4 3 Slightly disturbed #Sensitive Taxa 0 1 30 #Sed Sens Taxa 0 1 Modified HBI 4.8 3 Moddisturbed %Tolerant Taxa 85.7 1 20 Stressor Scores %Sed Tol Taxa 3.2 5 Severely disturbed Temperature Stress: 23.0 % Dominant(1) 34.1 3 10 Fine Sediment Stress: 18.6 TOTAL MMI SCORE 0 22 Cole Ecological,Inc. 43 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary COL..E Stream Name: Boeckman Creek RESTAd ECOLOO}CAL,We. Location: Restoration reach at Rose Lane (LOWER) Latitude: 45.29917142 County,State: Clackamas,Oregon Longitude: -122.754864 Date sampled: 9/15/2018 Reach Length: 102 m Personnel: M. Cole &C. Burtch Physical and Chemical Conditions Summary Site Location " `^ Instream Physical Characteristics �. ` i Wetted Width (m) 2.3 � FIMI Bankfull Width (m) 4.0 0% 50% 100% "=�'/ % Rapids/Casc. 0.0 % Riffles 22.5 %Rapids/Cast. ❑%Riffles aOeCkm'" t- % Glides/Runs 19.6 •%Glides/Runs ■%Pools % Pools 57.8 \ e , Substrate 100.0- %Wood WD 1.8 """` Cgleearth % Hardpan HP 0.0 80.0• / % Fines FN 0.0 60.0- - Survey start,facing upstream %Sand SA 0.0 : % Fine Gravel GF 5.5 40.0- . - % Crse Gravel GC 65.5 20.0_ - .r Cobble CB 27.3 ;� r• Bulder BL 0.0 0 = z < � 0 CO m m ' • _ % Bedrock BR 0.0 :- - % Embeddedness 12.5 - ' -• #- LWD (pieces/100 m) 20 Embeddedness _." ' Eroding Banks (%) 88 Undercut Banks (%) 11 .�E Rioarian Zone Characteristics Surve end,facin: downstream Canopy Cover(%) 95 Canopy Cover Riparian Buffer Width (m) 58 • Rip Zone Tree Cover(%) 68 "+. r-' Rip Non-Native Cover(%) 34 _ _ -1. Chemical Characteristics ` ti_ Water Temperature (°C) 12.77 Riparian Buffer Width (m) •'' -A'' �', Specific Cond (µS/cm) 207 Dissolved Oxygen (mg/L) 9.03 I I I I " pH 7.11 0 25 50 75 100 47 Time of Measurement 845 CE Sample ID: 18-122-13 Biological Conditions Summary Sample Method:OR 8-kick Target Habitat: Riffle DEO METRIC SCORES PREDATOR O/E Score Raw Stand. 50 Disturbance Richness 21 3 Non-disturbed Year Score Level Mayfly 2 1 40 2013 0.388 Most Stoneflv 1 1 2018 0.437 Most Ca d d i s fl v 2 1 Slightly disturbed #Sensitive Taxi 1 1 30 #Sed Sens Taxa 0 1 Modified HBI 5.4 1 Mod disturbed %TolerantTax8 45.8 1 20 StressorScores %Sed Tol Taxa 5.1 5 Severely disturbed Temperature Stress: 22.1 % Dominant(1) 24.8 3 10 Fine Sediment Stress: 25.3 TOTAL MMI SCORE 18 Cole Ecological,Inc. 44 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary G0LE Stream Name: Boeckman Creek MID ECOLOO}CAL,[uc Location: at Kolbe/Schroder Lane Bridge (MID) Latitude: 45.301207 County,State: Clackamas,Oregon Longitude: -122.756831 Date sampled: 9/15/2018 Reach Length: 101 m Personnel: M. Cole &C. Burtch Physical and Chemical Conditions Summary Site Location Instream Physical Characteristic Wetted Width (m) 1.5 FIMI . „,. Bankfull Width (m) 2.3 0% 50% 100% % Rapids/Casc. 0.0 . % Riffles 7.9 %Rapids/Casc. ❑%Riffles Glide s/Runs es/Runs 0.0 . % ■%Glides/Runs ■%Pools = . % Pools 92.1 l+ Substrate 100.0- %Wood WD 0.0 1 % Hardpan HP 0.0 80.0- i % Fines FN 5.0 60.0- Survey start,facing upstream %Sand SA 0.0 % Fine Gravel GF 10.0 40.0- !4. i •F % Crse Gravel GC 35.0 20.0 • - % Cobble CB 50.0 10.1 "'soya Bulder BL 0.0 00 0 = Z < U- 0 CO m m % Bedrock BR 0.0 • % Embeddedness 24.0 LWD (pieces/100 m) 3 Embeddedness •.• Eroding Banks (%) 1004 Undercut Banks (%) 42 Rioarian Zone Characteristics Survey end,facin: downstream Canopy Cover(%) 51 Canopy Cover - ' - Riparian Buffer Width (m) 25 • Rip Zone Tree Cover(%) 28 Rip Non-Native Cover(%) 58 • Chemical Characteristics .. 'y • Water Temperature (°C) 13.29 Riparian Buffer Width (m) Specific Cond (µS/cm) 197 . . .4 I Dissolved Oxygen (mg/L) 7.46 . I I ', pH 6.91 0 25 50 75 100 Time of Measurement 1130 CE Sample ID: 18-122-14 Biological Conditions Summary Sample Method:OR 8-kick Target Habitat: Riffle DEO METRIC SCORES PREDATOR O/E Score Raw Stand. 50 Disturbance Richness 24 3 Non-disturbed Year Score Level Mayfly 3 1 40 2018 0.583 Most Stoneflv 1 1 Ca d d i s fl v 2 1 Slightly disturbed #Sensitive Taxi 1 1 30 #Sed Sens Taxa 0 1 Modified HBI 5.4 1 Mod disturbed %TolerantTax8 65.3 1 20 StressorScores %Sed Tol Taxa 12.9 3 ,Severely disturbed Temperature Stress: 23.4 % Dominant(1) 32.3 3 10 FineSedimentStress: 42.4 TOTAL MMI SCORE • 16 Cole Ecological,Inc. 45 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary G0LE Stream Name: Boeckman Creek UPPER ECOLOGICAL,[um- Location: at Boeckman Trail footbridge UPPER Latitude: 45.309137 County,State: Clackamas, Oregon Longitude: -122.753047 Date sampled: 9/15/2018 Reach Length: 81 m Personnel: M.Cole &C. Burtch Physical and Chemical Conditions Summary Site Location Instream Physical Characteristics - : . - - Wetted Width (m) 1.7 - - ; • - ' Bankfull Width (m) 4.4 0% 50% 100% - • % Rapids/Casc. 0.0 �� _ A % Riffles 14.8 o%Rapids/Casc. ❑%Riffles _ ;II % Glides/Runs 9.9 ■%Glides/Runs ■%Pools • % Pools 75.3 - Substrate too.o- • %Wood WD 4.0 % Hardpan HP 0.0 80.0- • % Fines FN 3.0 60.0- Survey sta rt,facing upstream %Sand SA 11.0 r •�' i , • a: % Fine Gravel GF 42.0 40.0 • • 114 lilliW, Crse Gravel GC 40.0 20.0 't ...... 5 % Cobble CB 0.0 ^ ^ n _ . + _` % Bulder BL 0.0 0.0 p a �z < Um. �.� er�4 - r . % Bedrock BR 0.0 = LL u) 0 0 " m m 1.••' - .4'• �„ _'l Embeddedness 21.4 LWD (pieces/100 m) 14 Embeddedness - Eroding Banks (%) 100 -r'�'Ui __.{ ;.„ Undercut Banks (%) 11 yilk - - .'---0 Riparian Zone Characteristics Survey end,facin_• downstream Canopy Cover(%) 97 Canopy Cover ,• Riparian Buffer Width (m) 70 -* Rip Zone Tree Cover(%) Rip Non-Native Cover(%) 30 - �` 0 Chemical Characteristics . L. • -,. Water Temperature (°C) 13.11 Riparian Buffer Width (m) • - Specific Cond (µS/cm) 179 4 ' 1 1 I . ' �"Dissolved Oxygen (mg/L) 8.87 . pH 7.18 0 25 50 75 100 te . Ta 01. Time of Measurement I 1230 CE Sample ID: 18-122-15 Biological Conditions Summary Sample Method:OR 8-kick Target Habitat: Riffle DEQ METRIC SCORES PREDATOR O/E Score Raw Stand. - 50 Disturbance Richness 25 3 Non-disturbed Year Score Level Mayfly 1 1 40 2018 0.583 Most Stoneflv 1 1 Caddisflv 2 1 Slightly disturbed #Sensitive Taxz 1 1 30 #SedSensTax8 0 1 Modified HBI 5.6 1 Mod disturbed %Tolerant Taxz 65.4 1 20 StressorScores %Sed Tol Taxa 46.1 1 7 Severely disturbed Temperature Stress: 18.8 % Dominant(1) 34.8 3 10 Fine Sediment Stress: 29.3 TOTAL MMI SCORE • 14 Cole Ecological,Inc. 46 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary GQLE Stream Name: Coffee Creek L°COLOgFCAL.:me_ Location: at 5th Ave Latitude: 45.34613529 County,State: Clackamas, Oregon Longitude: -122.618168 Date sampled: 9/14/2018 Reach Length: 36 m Personnel: M.Cole &C. Burtch Physical and Chemical Conditions Summary Site Location Instream Physical Characteristics sr ' � '' I - � a � Wetted Width (m) 1.2 I I �1 , Bankfull Width (m) 2.4 0% 50% ° 100% _ % Rapids/Casc. 0.0 % Riffles 72.2 o%Raids/Casc. 0%Riffles �� � J % Glides/Runs 0.0 ■%Glides/Runs ■%Pools % Pools 27.8 _ „ � "- g ` Substrate 1oo.o- -- !' r . Wood WD 0.0 7 r 1 .l .P4 % Hardpan HP 0.0 80.0- 'nc "- % Fines FN 0.9 60.0- Surveystart,facing upstream %Sand SA 0.0 % Fine Gravel GF 3.7 ao.o } ih zo.o % Crse Gravel GC 28.0 �+ • • % Cobble CB 65.4RA. I Bulder BL 1.9 0.0 �, ti . _ m m Bedrock BR 0.0 S. - I A _ % Embeddedness 25.1 g.LWD (pieces/100 m) 0 Embeddedness r •�+ # Eroding Banks (%) 55 e r ''w Undercut Banks (%) 0 • Riparian Zone Characteristics Surve end,facin: downstream Canopy Cover(%) 84 Canopy Cover ` Riparian Buffer Width (m) 60 .i. Rip Zone Tree Cover(%) 48 ' I ;wt am r • Rip Non-Native Cover(%) 60 -• _ - ,r Chemical Characteristics Water Temperature (°C) 13.97 Riparian Buffer Width (m) .•,--#+:�} .11 - Specific Cond (µ5/cm) 76 Dissolved Oxygen (mg/L) 9.95 , 4 pH 6.8 0 25 50 75 100 , ! ;Aviltic Time of Measurement I 1115 CE Sample ID: 18-122-16 Biological Conditions Summary Sample Method:OR 8-kick Target Habitat: Riffle DEQ METRIC SCORES PREDATOR O/E Score Raw Stand. 50 Disturbance Richness 25 3 Non-disturbed Year Score Level Mayfly 4 3 40 2013 0.63 Most Stoneflv 3 3 2018 0.485 Most Caddisflv 2 1 Slightly disturbed #Sensitive Tam 2 3 ()-30 #Sed Sens Taxa 1 3 Modified HBI 4.5 3 Moddisturbed %Tolerant Taxa 21.9 3 20 StressorScores %Sed Tol Taxa 4.8 5 Severely disturbed Temperature Stress: 16.7 % Dominant(1) 27.9 3 Fine Sediment Stress: 28.8 TOTAL MMI SCORE Li 30 - 10 Cole Ecological,Inc. 47 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary COLE Stream Name: Singer Creek ECOLOCiECAL.We. Location: at Singer Creek Park Latitude: 45.34771701 County,State: Clackamas,Oregon Longitude: -122.601959 Date sampled: 9/14/2018 Reach Length: 63 m Personnel: M.Cole &C. Burtch Physical and Chemical Conditions Summary Site Location Instream Physical Characteristics - 1 Wetted Width (m) 1.4 1 I " �_ l Bankfull Width (m) 2.9 0% 50% 100% % Rapids/Casc. 0.0 % Riffles 65.1 %Rapids/Casc. o%Riffles % ■%Glides/Runs ■%Pools s,9e, �'- Glides/Runs 3.2 - m • Pools 31.7 •�A Substrate 1oo.o- Wood WD 1.9 c;uo81certh % Hardpan HP 3.7 80.0- • Fines FN 12.0 60.0- Survey start_,facing upstream %Sand SA 0.9 ' . % Fine Gravel GF 13.9 40.0- fr %Crse Gravel GC 52.8 200- - F'•ri141:.• • • %Cobble CB 12.0 •;• -'•�' • • Bulder BL 2.8 0.0 - 1 In a C.) m -Z a U- c IZ * . *# % Bedrock BR 0.0 _ " u) o o o 00 m • Embeddedness 30.4 47 . - Large Wood Rating 4.7619 Embeddedness - k • - , - Eroding Banks (%) 70.1587Actm-`- ./ Undercut Banks (%) - Riparian Zone Characteristics Survey end,facing downstream Canopy Cover(%) 97 Canopy Cover ,_ -� Riparian Buffer Width (m) 60 • r- Rip Zone Tree Cover(%) 45 r - Rip Non Native Cover(%) 45 - r Chemical Characteristics T .� #' - , f Water Temperature (°C) 12.04 Riparian Buffer Width (m) . - r. ;l1C- Specific Cond (1.15/cm) 90 'w, Dissolved Oxygen (mg/L) 9.82 'II 1 • +�e ii, - - pH 7.25 0 25 50 75 100 •+ �� • • Time of Measurement 800 J F CE Sample ID: 18-122-17 Biological Conditions Summary Sample Method:OR 8-kick Target Habitat: Riffle DEQ METRIC SCORES PREDATOR O/E Score Raw Stand. 50 Disturbance Richness 35 3 Non-disturbed Year Score Level Mayfly 5 3 40 2013 0.582 Most Stoneflv 6 5 2018 0.776 Most Caddisflv 6 3 Slightly disturbed #Sensitive Taxa 4 3 30 #Sed Sens Tax2 2 5 Modified HBI 3.3 5 Moddisturbed %Tolerant Taxa 19.8 3 20 StressorScores Sed Tol Taxa 3.1 5 Severely disturbed Temperature Stress: 16.5 % Dominant(1) 30.2 3 Fine Sediment Stress: 17.6 TOTAL MMI SCORE 0 38 - 10 Cole Ecological,Inc. 48 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary LE Stream Name: Rinearson Creek ECO•LOOTCAL-I . . Location: River Road (Brookside Village Apartments) Latitude: 45.380363 County,State: Clackamas, Oregon Longitude: -122.607596 Date sampled: 9/14/2018 Reach Length: 65 m Personnel: M.Cole &C. Burtch Physical and Chemical Conditions Summary Site Location _ Instream Physical Characteristics Wetted Width (m) 1.3 , ,,, a Bankfull Width (m) 1.9 0% 50% 100% 1 % Rapids/Casc. 0.0 . " , `M % Riffles 0.0 o%Rapids/Casc. o%Riffles ,• J.. liil % Glides/Runs 70.8 ■%Glides/Runs ■%Pools ....- q; % Pools 29.2 ` Substrate loom- ' +w i %Wood WD 0.0 % Hardpan HP 0.0 80.0- — ., ti c t` % Fines FN 70.0 60.0- Surveystart,facin: u•stream %Sand SA 0.0 • 'J % Fine Gravel GF 30.0 40.0- $1•41 % Crse Gravel GC 0.0 20.0- Ii .-Cobble CB 0.0 , �, .� ,. • l,, _ee, Bulder BL 0.0 00 iii w !4 o a z < IL 0 CO -IIr y . r z _ r % Bedrock BR 0.0 _ " 0) 0 o u CO °' e - — f % Embeddedness 98.5 • ...'_ '� ' x' Large Wood Rating 0 Embeddedness ih ' Eroding Banks (%) 100 •I- . • Undercut Banks (%) 0 .... F 'I - . Rinarian Zone Characteristics Surve end facing downstream Canopy Cover(%) 74 CanopyCover % , , ' Riparian Buffer Width (m) 3 ' Rip Zone Tree Cover(%) 25 I4 1 " ille Rip Non-Native Cover(%) 0 , Chemical Characteristics Water Temperature (CC) 16.56 Riparian Buffer Width (m) - Specific Cond (µS/cm) 181 Dissolved Oxygen (mg/L) 7.17 F I I I I •�' pH 6.3 0 25 50 75 100 Time of Measurement 1305 CE Sample ID: 18-122-18 Biological Conditions Summary Sample Method:OR 8-kick Target Habitat: Riffle DEQ METRIC SCORES PREDATOR O/E Score Raw Stand. 50 Disturbance Richness 16 1 Non-disturbed Year Score Level Mayfly 0 1 40 2013 0.242 NA Stoneflv 0 1 2018 0.291 Most Caddisflv 2 1 Slightlydisturbed #Sensitive Tax< 0 1 30 #Sed Sens Taxa 1 3 Modified HBI 6.3 1 Mod disturbed %Tolerant Taxa 92.3 1 20 Stressor Scores %Sed Tol Taxa 60.9 1 Temperature Stress: 20.5 % Dominant(1) 60.0 1 V to Severely disturbed Fine Sediment Stress: NA TOTAL MMI SCORE • 12 Cole Ecological,Inc. 49 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary 1O Stream Name: Minthorn Creek ECOLOGICAL.INC. Location: Box Culvet at SE Harmony/Lynwood Roads Latitude: 45.43181479 County,State: Clackamas, Oregon Longitude: -122.598378 Date sampled: 9/14/2018 Reach Length: 39m Personnel: M.Cole &C. Burtch Physical and Chemical Conditions Summary Site Location Instream Physical Characteristics _ ¢ Wetted Width (m) 0.5 F-Inrill. . t ,- Bankfull Width (m) 2.0 0% 50% 100% 4,. 10 % Rapids/Casc. 0.0 J s� �• % Riffles 41.0 o%Rapids/Casc. 0%Riffles .•��1r '" i 7 %Glides/Runs 0.0 •%Glides/Runs ■%Pools � y„ % Pools 59.0 . s iq Substrate -Imo- ,y N. ' ,A �Otpt�pt/ll// %Wood WD 0.0 _ • a`,... °a}: _,41 !IA/�nrl' % Hardpan HP 0.0 80.0- ,•,�, , % Fines FN 10.0 60.0 - Surveystart,facing upstream %Sand SA 0.0 _ ill % Fine Gravel GF 20.0 40.0 - 'w Crse Gravel GC 45.0 20.0 I , ,�• •••'t: - % Cobble CB 25.0 • Bulder BL 0.0 00 0'a Z a ��m J'� ' _ �T •r % Bedrock BR 0.0 I a. woo C aim I rut•'�;. - % Embeddedness 37.0 ' . ;•�+�+� LWD (pieces/100 m) 0 Embedded ness '' + . =• _ is Eroding Banks (%) 54.6154 , ram'= Undercut Banks (%) 0 '. '! •- • i 1* Riparian Zone Characteristics Survey end,facing downstream Canopy Cover(%) 46.0784 Canopy Cover k. iker {F 4 t Riparian Buffer Width (m) 1 •.on .4± 1 Rip Zone Tree Cover(%) 5 z r '. Rip Non-Native Cover(%) 45 ' . Chemical Characteristics Water Temperature (°C) 17.52 Riparian Buffer Width (m) ' I. ` ' Specific Cond (µS/cm) 224 p II • _ ' ` I'•_ Dissolved Oxygen (mg/L) 6.35 I I I 1 • r: pH 7.15 0 25 50 75 100 f • Time of Measurement 1400 CE Sample ID: 18-122-19 Biological Conditions Summary Sample Method:OR 8-kick Target Habitat: Riffle DEQ METRIC SCORES PREDATOR O/E Score Raw Stand. - 50 Disturbance Richness 17 1 Non-disturbed Year Score Level Mayfly 1 1 40 2013 0.388 Most Stoneflv 0 1 2018 0.2 Most Caddisflv 0 1 Slightly disturbed #Sensitive Taxi' 0 1 30 #Sed Sens Taxi' 0 1 Modified HBI 6.1 1 Mod disturbed %Tolerant Taxa 81.2 1 20 StressorScores %Sed Tol Taxa 39.3 1 Temperature Stress: 19.7 % Dominant(1) 30.0 3 10 Severely disturbed Fine Sediment Stress: 62.6 TOTAL MMI SCORE 12 Cole Ecological,Inc. 50 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary coLE Stream Name: Tanner Creek ecococacr,c,tNQ Location: Downstream of Imperial Drive Latitude: 45.3516544 County,State: Clackamas,Oregon Longitude: -122.630998 Date sampled: 9/14/2018 Reach Length: 50 m Personnel: M.Cole &C. Burtch Physical and Chemical Conditions Summary Site Location lnstream Physical Characteristics A <4".,'`, .. I I -• "� ,. , ' kv'n Wetted Width (m) 1.6 I I r ` •e r x` `"-� Bankful l Width (m) 3.1 0% 50% 100% /� i -•"1'h ` % Rapids/Casc. 32.0 44s % ❑%Raids/Casc. 0%Riffles - ''+. Riffles 36.0 p �a % Glides/Runs 10.0 •%Glides/Runs ■%Pools '' % Pools 32.0 ". oil,Substrate 100.0- `"' %Wood WD 2.1 % Hardpan HP 0.0 ao.o - v % Fines FN 0.0 60.0 - Survey start,facing upstream % Sand SA 0.0 V' • -.+.t.•#r3tr. ' . #. , % Fine Gravel GF 8.3 40.0 - % Crse Gravel GC 27.1 20.0 • • - • �L- �� • % Cobble CB 52.1 , - 5t • 1' % Bulder BL 10.4 00 o' a <'Z' IL 0 CO J ` % Bedrock BR 0.0 I " (1) 0 0 U 0o m y='* ~ % Embeddedness 14.5 Large Wood Rating 8 Embeddedness *' ' Eroding Banks (%) 6.8 - - •+ 1r - Undercut Banks (%) 5.8 ro II'. �* r �,- • Rioarian Zone Characteristics Survey end,facing downstream Canopy Cover(%) 97 Canopy Cover 4_ I. . ,it •, % ;: '_r Riparian Buffer Width (m) 28 -� ; Rip Zone Tree Cover(%) 63 ' +I �y +�. Rip Non-Native Cover(%) 30 . - •.. , F Chemical Characteristics r Water Temperature (CC) 13.54 Riparian Buffer Width (m) A. • SpecificCond (µS/cm) 124 •T' II Dissolved Oxygen (mg/L) 9.92 I I 1 pH 7.09 0 25 50 75 100 ,1 F -.I, - Time of Measurement 1000 CE Sample ID: 18-122-20 Biological Conditions Summary Sample Method:OR 8-kick Tar et Habitat: Riffle DEO METRIC SCORES PREDATOR O/E Score Raw Stand. - 50 Disturbance Richness 14 1 Non-disturbed Year Score Level Mayfly 1 1 40 2013 0.242 Most Stoneflv 0 1 2018 0.388 Most Caddisfly 0 1 Slightly disturbed #Sensitive Taxz 0 1 30 #Sed Sens Taxz 0 1 Modified HBI 6.0 1 Mod disturbed %TolerantTaxz 30.5 3 20 StressorScores % Sed Tol Taxa 14.8 3 Severely disturbed Temperature Stress: 16.8 % Dominant(1) 25.9 3 l� Fine Sediment Stress: 22.3 TOTAL MMI SCORE 16 Cole Ecological,Inc. 51 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary COLE Stream Name: Trillium Creek AIMIMI ECOLOGICAL,bac Location: Caloroga Rd Latitude: 45.39573241 County,State: Clackamas,Oregon Longitude: -122.637776 Date sampled: 9/17/2018 Reach Length: 74m Personnel: M. Cole &C. Burtch Physical and Chemical Conditions Summary Site Location Instream Physical Characteristics, '` Wetted Width (m) 2.0 I -1Mil Bankfull Width (m) 4.3 0% 50% 100% "- � '. •r _'' % Ra ids/Casc. 0.0 % Riffles 47.3 ❑%Rapids/Casc. 0%Riffles ' %Glides/Runs 10.8 ■%Glides/Runs ■%Pools % Pools 41.9 Substrate If p �oo.o- %Wood WD 0.0 � �� % Hardpan HP 0.0 80.0- fi to_ % Fines FN 0.9 60.0- Survey start,facing upstream %Sand SA 0.0 - - . 4-.11 or -r % Fine Gravel GF 4.6 40.0 • - . %Crse Gravel GC 46.8 20.0- ; . ' . -%Cobble CB 47.7 ••* - { ' '• �' % Bulder BL 0.0 0.0 o,a ,Z, Q ,^ U,m, J, � 1 irr� � 4. r k_ •. % Bedrock BR 0.0 = LL o o 0 " m CO F % Embeddedness 19.1 •+ --. LWD (pieces/100 m) 7 Embeddedness - • • '•} Eroding Banks (%) 45 - - • Undercut Banks (%) 0 • - : , 'r Riparian Zone Characteristics Survey end,facing downstream Canopy Cover(%) 85 Canopy Cover -i. ' t.•,a Riparian Buffer Width (m) 20 • 1':`' Rip Zone Tree Cover(%) 73 , � - _ +' Rip Non-Native Cover(%) 23 ri�' - r ; s � •• '/L •# Chemical Characteristics ' • - f - �* ■ r Water Temperature (°C) 12.81 Riparian Buffer Width (m) fi - , , Y.,, fJr Specific Cond (uS/cm) 113 �'�` • • • ```• ''` { Dissolved Oxygen (mg/L) 10.17 I I I I I - • _f+ i�� - - -J..1 pH 6.96 0 25 50 75 100 . , �`•. i x - Time of Measurement 800 CE Sample ID: 18-122-21 Biological Conditions Summary Sample Method:OR 8-kick Target Habitat: Riffle DEQ METRIC SCORES PREDATOR O/E Score Raw Stand. 50 Disturbance Richness 22 3 Non-disturbed Year Score Level Mayfly 3 1 40 2013 0.485 Most Stoneflv 0 1 2018 0.485 Most Caddisfly 3 1 Slightly disturbed #SensitiveTaxl 1 1 30 #Sed Sens Taxa 0 1 Modified HBI 5.3 1 Moddisturbed %Tolerant Taxa 60.8 1 20 Stressor Scores %Sed Tol Taxa 9.1 5 Severely disturbed Temperature Stress: 22.1 % Dominant(1) 21.2 3 Fine Sediment Stress: 30.3 TOTAL MMI SCORE • 18 10 Cole Ecological,Inc. 52 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary LE Stream Name: River Forest Creek eCOL-O9QCA1..Ii . Location: at Risley Park Latitude: 45.40751 County,State: Clackamas,Oregon Longitude: -122.64002 Date sampled: 9/17/2018 Reach Length: 75 m Personnel: M. Cole &C. Burtch Physical and Chemical Conditions Summary Site Location Instream Physical Characteristics , f y Wetted Width (m) 1.3 I' 4, • . . Bankfull Width (m) 2.2 0% 50% 100% 4 • .. % Rapids/Casc. 0.0 • y • % Riffles 2.7 o%Rapids/Casc. ❑%Riffles _• % Glides/Runs 37.3 •%Glides/Runs ■%Pools +.. % Pools 60.0 ' Substrate 1o0.0- %Wood WD 5.0 % Hardpan HP 0.0 80.0- % Fines FN 90.0 60.0 Survey start,facing upstream %Sand SA 0.0 I.,:% Fine Gravel GF 5.0 40.0 - 1 % Crs e Gravel GC 0.0 20.0- r r•�• t % Cobble CB 0.0 . - ti `# - ; • / % Bulder BL 0.0 00 o a z a� m m ' S 'rr " r LL (n U` C7 U m m ■ Bedrock BR 0.0 x� �.% Embeddedness 99.0 II P. .:•e�' LWD (pieces/100 m) 0 Embeddedness ' Eroding Banks (%) 100 l r, Undercut Banks (%) 0 r, Riparian Zone Characteristics Survey end,facing downstream Canopy Cover(%) 99 CanopyCover • " k Riparian Buffer Width (m) 7 tilin• , .� Rip Zone Tree Cover(%) 85s; • '- +� • 444 Rip Non-Native Cover(%) 8 ` - ri - Chemical Characteristics . i.• •4. f win Water Temperature (°C) 14.98 Riparian •Buffer Width (m) �-- ••• k Specific Cond (µS/cm) 162 I i "' w '�'' Dissolved Oxygen (mg/L) 2.19 ~ I I I I • - { pH 6.67 0 25 50 75 100 ''' Time of Measurement I 1300 CE Sample ID: 13-121-12 Biological Conditions Summary Sample Method:OR 8-kick Target Habitat: Riffle DEQ METRIC SCORES PREDATOR O/E Score Raw Stand. - 50 Disturbance Richness 12 1 Non-disturbed Year Score Level Mayfly 0 1 40 2018 0.194 NA Stoneflv 0 1 Caddisflv 0 1 Slightly disturbed #Sensitive Tax2 0 1 30 #Sed Sens Tax2 0 1 Modified HBI 7.4 1 Moddisturbed %TolerantTax2 19.7 3 20 StressorScores %Sed Tol Taxa 3.5 5 Severely disturbed Temperature Stress: 20.7 % Dominant(1) 64.2 1 10 Fine Sediment Stress: NA TOTAL MMI SCORE • 16 Cole Ecological,Inc. 53 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary coLE Stream Name: Boardman Creek REST ecoLoCac boa_ Location: restoration reach in Stringfield Park Latitude: 45.39876 County,State: Clackamas,Oregon Longitude: -122.62534 Date sampled: 9/17/2018 Reach Length: 75 m Personnel: M.Cole &C. Burtch Physical and Chemical Conditions Summary Site Location Instream Physical Characteristics ' _ .. . .Aalliii. ' . Wetted Width (m) 4.9 -•z- r, Bankfull Width (m) 9.1 0% 50% 100% '. �•- t A % Rapids/Casc. 0.0 �,. , % Riffles 0.0 %Rapids/Casc. o%Riffles """"; ° %Glides/Runs 0.0 •%Glides/Runs ■%PoolsN. �w ,. % Pools 100.0 Substrate loom- I %Wood WD 10.0 ', r % Hardpan HP 0.0 s0.o- ' % Fines FN 90.0 60.0- Survey start,Survey start,facing upstream %Sand SA 0.0 r •;'-� • . ` % Fine Gravel GF 0.0 40.0- L •`--trr - . %Crse Gravel GC 0.0 20.0- + %Cobble CB 0.0 01 1 C % Bulder BL 0.0 0.0-� ,.4...►V .ti o a z a ._ o co _1 EK iv 1' % Bedrock BR 0.0 _ " " c� 0 00 m • � � Embeddedness 99.0 . LWD (pieces/100 m) 9 Embeddedness Eroding Banks (%) 50 MO. • e Undercut Banks (%) 0 Riparian Zone Characteristics Surve end,facing downstream Canopy Cover(%) 34 Canopy Cover Riparian Buffer Width (m) 15 -,'I 111•• Rip Zone Tree Cover(%) 20 �� - Rip Non-Native Cover(%) 3 44114 Chemical Characteristics t Water Temperature (°C) 16.87 Riparian Buffer Width (m) .y -- '° Specific Cond (µS/cm) 186 I a -'} Dissolved Oxygen (mg/L) 2.99 ~ I I I I -- - p H 6.63 0 25 50 75 100 Time of Measurement 1410 CE Sample ID: 18-122-23 Biological Conditions Summary Sample Method:OR 8-kick Target Habitat: Riffle DEQ METRIC SCORES PREDATOR O/E Score Raw Stand. 50 Disturbance Richness 19 3 Non-disturbed Year Score Level Mayfly 1 1 40 2018 0.194 NA Stoneflv 0 1 Caddisflv 0 1 Slightly disturbed #Sensitive Taxi. 0 1 30 #Sed Sens Tax2 0 1 Modified HBI 6.6 1 Moddisturbed %Tolerant Tax2 45.5 1 20 StressorScores Sed Tol Taxa 23.2 3 Severely disturbed Temperature Stress: 24.6 % Dominant(1) 34.3 3 Fine Sediment Stress: NA TOTAL MMI SCORE W 16 10 Cole Ecological,Inc. 54 2018 Clackamas Co. MS4 Macroinvertebrates Reach Assessment Summary cQi..E Stream Name: Boardman Creek UPPER ECOLOGICAL,Imo. Location: at Boardman Ave (UPPER) Latitude: 45.394506 County,State: Clackamas,Oregon Longitude: -122.61751 Date sampled: 9/17/2018 Reach Length: 60 m Personnel: M.Cole &C. Burtch Physical and Chemical Conditions Summary Site Location Instream Physical Characteristics .b. Wetted Width (m) 1.2I 1 Bankfull Width (m) 3.1 0`)/050% 100% e. % Rapids/Casc. 0.0 % Riffles 0.0 o%Rapids/Casc. o%Riffles i .,...:„100: i �`. %Glides/Runs 75.0 ■%Glides/Runs ■%Pools % Pools 25.0 Substrate 100.0- %Wood WD 0.0 i % Hardpan HP 5.0. a0.0- % Fines FN 950 60.0- Survey start,facing upstream %Find SAGF 0.0 • gimp.% FineGravel GF 0.0 ao.o- `� %Crse Gravel GC 0.0 20.0 1 %Cobble CB 0.0 � " �« % Bulder BL 0.0 00 0 a Z < 0 U m CC # /° Bedrock BR 0.00 co % Embeddedness 99.5 LWD (pieces/100 m) 0 Embeddedness 66 ' Eroding Banks (%) 0 Undercut Banks (%) 0 Riparian Zone Characteristics — Survey end,facing downstream Canopy Cover(%) 21 Canopy Cover ,.- Riparian Buffer Width (m) 5 .- Rip Zone Tree Cover(%) 8 Rip Non-Native Cover(%) 25 Chemical Characteristics - f ��Water Temperature (°C) 18.9 Riparian Buffer Width (m) 'r.... _ - Specific Cond (µS/cm) 230 I I I I , J Dissolved Oxygen (mg/L) 0.52 1 k—±'*• . 10. pH 6.63 0 25 50 75 100 „i Time of Measurement 1510 CE Sample ID: 18-122-24 Biological Conditions Summary Sample Method:OR 8-kick Tar et Habitat: Riffle DEO METRIC SCORES PREDATOR O/E Score Raw Stand. - 50 Disturbance Richness 9 1 Non-disturbed Year Score Level Mayfly 0 1 40 2018 0.194 NA Stoneflv 0 1 Caddisflv 0 1 Slightly disturbed #Sensitive Taxz 0 1 30 #Sed Sens Taxa 0 1 • Modified HBI 6.4 1 Mod disturbed %Tolerant Taxa 161.5 1 20 StressorScores %Sed Tol Taxa 67.7 1 Severely disturbed Temperature Stress: 22.8 % Dominant(1) 58.3 1 ` 10 Fine Sediment Stress: NA TOTAL MMI SCORE IP 10 Cole Ecological,Inc. 55 2018 Clackamas Co. MS4 Macroinvertebrates