West Durham Basin Improvement Program

Generational investment in sewer pipes will extend across several cities throughout Washington County.

Click map to explore the interactive version.Construction on West Durham Basin Improvement Program projects began in summer 2018. Initial projects will replace the aging interceptor – the pipe infrastructure that helps control flow – constructed in 1974, with more resilient and larger pipes. This upgrade will provide a pipeline that can move 20 millions of gallons of wastewater each day and will handle capacity through 2040.

Clean Water Services is investing nearly $70M into this 10-year sanitary sewer program to support growth in areas of Beaverton, Tigard, Tualatin, Sherwood, unincorporated Washington County and King City, including nearby urban reserves.

Current projects include:

Multiple agencies are working together to reduce project costs and effects on residents from multiple construction projects. This program aims to reduce impacts to local parks and natural areas while providing the service needed to support current and anticipated growth.

Check back periodically for Clean Water Works project updates. Learn more about project descriptions and anticipated impacts by location:

King City

Construction has begun (PDF, 913B) and several improvements are planned to provide additional sanitary sewer service capacity for near- and long- term growth in portions of the Bull Mountain, South Cooper Mountain and River Terrace development areas and within urban reserves adjacent to the King City and neighboring areas. Construction will last into spring 2019.

Project improvements include:

  • Installation of sanitary sewer at SW 131st: Starting approximately 400 feet south of SW Bedford Street and ending at SW Fischer Road, the District will install a new sanitary sewer pipe ranging in size from 30 to 24inches. The new sanitary sewer line will be located near the centerline of the road. All existing side sewer lines and homes served by the existing line will be connected to the new sewer before the existing line is abandoned. No disruption in service is expected.
  • Upsize of existing sanitary sewer at SW 131st: Starting at Fischer Road and ending 200 feet north of SW Deergrove Lane, the District will replace an existing 18-inch line with new 21- and 24-inch lines.  No disruption in service is expected.
  • Installation of new sanitary sewer line at SW 131st: The existing sanitary line at SW 131st will be extended north from its current terminus to and through Deer Creek Elementary School and onto SW Beef Bend Road.
  • Installation of storm drainage system at SW 131st: Starting near SW Fischer Road and ending at SW Dickson Street, the District will install a new 48-inch storm pipe to replace the existing undersized and corroded infrastructure. This pipe will be installed at the same time as the sanitary sewer to minimize impacts to traffic.
  • Installation of new sanitary sewer line at River Terrace North: Starting at SW Satsuma Avenue and ending at SW Calabash Terrace.

Residents should anticipate increased truck traffic in the area along with lane shifts and lane closures along SW 131st. Traffic will remain open throughout the project and access to homes along SW 131st will remain intact, however residents should expect traffic delays.

Tigard

The Upper Tualatin Interceptor (UT) serves the cities of Tualatin, Tigard, King City, and Sherwood and flows into the Durham Wastewater Treatment Plant. The UT must be replaced in order to meet the long term capacity needs in the area. This project will be constructed in two phases to minimize costs and accelerate the construction schedule. 

Phase 1 – Scheduled from June 2018 through December 2018:

  • No construction projects are slated for Tigard during Phase 1.

Phase 2 – Scheduled from September 2018 through April 2019:

  • Construction activities include installing pipe, constructing trenchless crossing of the Tualatin, surface restoration, and vegetation enhancement within Cook Park in Tigard. Residents should expect increased truck traffic into/out of the work zone, construction through Cook Park and related trail closures/detours.
Tualatin

The Upper Tualatin Interceptor (UT) serves the cities of Tualatin, Tigard, King City, and Sherwood and flows into the Durham Wastewater Treatment Plant. The UT must be replaced in order to meet the long term capacity needs in the area. This project will be constructed in two phases to minimize costs and accelerate the construction schedule. 

Phase 1 – Scheduled from June 2018 through December 2018:

  • Construction activities include installing pipe, constructing trenchless crossing of the Tualatin, surface restoration and vegetation enhancement within the vicinity of Hwy 99 and SW Hazelbrook Road in Tualatin. Residents should anticipate increased truck traffic into/out of the work zone, closure of Hwy 99 boat ramp on Tualatin (June through August).

Phase 2 – Scheduled from May 2019 through February 2020:

  • Construction will occur south of the Tualatin River and to the west. Residents should anticipate increased truck traffic into/out of the work zone, construction through Jurgens Park.
Unincorporated Washington County

Several improvements are planned to provide additional sanitary sewer service capacity for near- and long- term growth in portions of the Bull Mountain, South Cooper Mountain and River Terrace development areas and within urban reserves adjacent to the Cities of Tigard, Beaverton, King City, and unincorporated Washington County. Construction is planned to begin in late summer 2018 and last into spring 2019.

Project improvements include:

  • Upsize of existing sanitary sewer: Just North of the Tualatin River from SW 131st to SW 122nd, the District will replace an existing 27-inch pipe with a new 42-inch pipe. This section of pipe is located on private property and will have minimal impact to the general public. However, you can expect increased construction traffic on SW 131st, SW 122nd and SW Fischer Roads.
  • Installation of sanitary sewer in SW Beef Bend Road: Between SW Peachtree and SW 133rd, the District will install a new 27-inch sanitary sewer pipe and abandon the existing 8-inch pipe. All homes served by the existing line will be reconnected to the new 27-inch pipe. No disruption in service is expected; however, this section of the project is deep and, coupled with a narrow roadway, will require some road closures. Beef Bend Road will be closed for 30 days, starting September 4, 2018. Expect delays.
  • Upsize of existing sanitary sewer at SW Beef Bend Road: Between SW Myrtle Ave and SW Peachtree, the District will replace the existing line with a new 24-inch pipe. No disruption in service is expected.

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