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City of Lake Oswego
Willamette River railroad bridge

Public Works Standard Details

The following index lists the City's Standard Details, hereinafter "Details," for construction of public improvements. The Details can be accessed individually for review or downloading by clicking on the detail number.  They are available in AutoCAD, JPG, and Adobe Acrobat.

These Details are intended for use by design professionals for the design and construction of public improvements required to provide service to private development but which are owned and maintained by the City of Lake Oswego. They should also be used for the design and construction of privately owned and maintained facilities to be located in City owned rights-of-way and/or to be connected to City owned facilities.

It is expected that changes in technology, materials of construction, and contractors' means and methods will require periodic revision of these Details. However, modification of these Details without express approval by the City Engineer is prohibited. Your assistance in reporting any errors and providing suggestions for additions, deletions or revisions to maintain these Details is welcomed and appreciated. Inquiries regarding current or imminent revisions, suggestions, and reports of errors or omissions should be directed to the City Engineer.

We try to update these details on a regular basis, however, we do not guarantee that the most recent version will be published on this site.  To guarantee that the most up-to-date version is available on this web site, please contact the Engineering Department at 503-635-0270 or email. 

  • E - Erosion Control
  • S - Street
  • SD - Storm
  • W - Water
  • WW - Wastewater
Numbersort icon Title Revision Download
WW9-10

Step System (Septic Tank Effluent Pump) 2" Pressure Cleanout Assembly

08/14/2012
WW9-09

Step System (Septic Tank Effluent Pump) Typical Pipe & Trench Detail

08/14/2012
WW9-08

Step System (Septic Tank Effluent Pump) Typical 4" Lateral Cleanout

08/14/2012
WW9-07

Step System (Septic Tank Effluent Pump) Typical 2" Service Connection Detail

08/09/2012
WW9-06

Step System (Septic Tank Effluent Pump) Control and Alarms

08/09/2012
WW9-05

Step System (Septic Tank Effluent Pump) Tank Riser Detail

08/08/2012
WW9-04

Step System (Septic Tank Effluent Pump) Effluent Pumping Tank Equipment

08/07/2012
WW9-03

Step System (Septic Tank Effulent Pump) Gravity Discharge Tank Equipment

08/07/2012
WW9-02

Step System (Septic Tank Effluent Pump) Septic Tank Side View

02/10/2012
WW9-01

Step System (Septic Tank Effluent Pump) Septic Tank Top View

02/10/2012
WW4-03C

Typical Service Lateral Connection (Internally Rehabilitated Mainlines)

04/23/2012
WW4-03B

Typical Service Lateral Duplex (2)

04/23/2012
WW4-03A

Typical Service Lateral

04/23/2012
WW4-02

Standard Pipe Casing Detail

04/19/2012
WW4-01

Sanitary Sewer Strap-On Type Tapping Tee

04/18/2012
WW3-01C

2" Pressure Cleanout Assembly

04/24/2012
WW3-01B

Typical Sanitary Sewer Cleanout (Outside Traffic Areas)

02/10/2012
WW3-01A

Typical Sanitary Sewer Cleanout (Traffic Areas Only)

02/07/2012
WW2-03

Watertight Manhole Frame & Cover

07/24/2012
WW2-02

Suburban Manhole Frame

07/25/2012
WW2-01

Standard Manhole Frame & Cover

07/25/2012
WW1-10

Manhole Step (From CWS Drawing No.11-ST)

03/26/2012
WW1-09

Inside Drop & Connection to Existing Manhole

03/23/2012
WW1-05

Outside Drop Manhole

02/28/2012
WW1-04

Manhole Bases 42" & 48" Pipe

02/27/2012
WW1-03

Manhole Bases 24" - 36" Pipe

02/27/2012
WW1-02A

48" Extended Precast Manhole Base

08/20/2012
WW1-02

Standard Manhole Details

02/16/2012
WW1-01

Flatttop Manhole 6" to 21" Pipe

02/07/2012
W9-01M

Meter Installation W/By-Pass 2" and Larger

07/09/2013
W9-01L

Reduced Pressure Backflow Assembly Customer Owned In Vault

07/08/2013
W9-01J

1" Reduced Pressure Backflow Preventor

07/02/2013
W9-01I

Reduced Pressure Backflow Assembly 2 1/2" - 10" Customer Owned (Above Ground)

06/27/2013
W9-01H

Reduced Pressure Detector Backflow Assembly 2 1/2" - 10" Customer Owned In Vault

06/26/2013
W9-01G

Reduced Pressure Detector Backflow Assembly 2 1/2" - 10" Customer Owned (Above Ground)

06/17/2013
W9-01F

Double Check Detector Assembly Customer Owned (Above Ground) 3" Thru 10"

06/17/2013
W9-01E

Double Check Detector Assembly 3" Thru 10" (for Fire Service)

06/13/2013
W9-01D

DCVA - 3" Thru 10" (for Domestic Service Only) Below Ground Installation

06/13/2013
W9-01C

Double Check Valve Assembly Customer Owned (Above Ground) 3" Thru 10"

06/03/2013
W9-01B

1", 1 1/2", 2" & 2 1/2" Double Check Installation 

06/03/2013
W9-01A

Typical Backflow Preventer for Lawn Sprinkler Systems

05/24/2013
W8-01G

Irrigation Control Typical Zone Valve Installation

05/20/2013
W8-01F

Irrigation Control Typical Underdrain Crossing

05/20/2013
W8-01E

Irrigation Control Typical Carrier Sleeve

05/16/2013
W8-01D

Irrigation Control Typical Small Irrigation Head Installation

05/16/2013
W8-01C

Irrigation Control Quick Coupler Valve

05/15/2013
W8-01B

IrrigationControl Typical Drain Valve

05/13/2013
W8-01A

Irrigation Control Backflow Preventor

05/09/2013
W7-03B

PRV Vault Section

05/07/2013
W7-03A

PRV Vault Plan

05/10/2013