Lake Oswego Water Treatment Plant

Facility Description

The City of Lake Oswego has operated a drinking water treatment plant in West Linn’s Robinwood neighborhood since 1968. The Lake Oswego Tigard Water Partnership plans to upgrade and expand the treatment plant, located between Kenthorpe Way and Mapleton Drive, to meet current and future drinking water needs. The upgraded plant will supply Lake Oswego and Tigard, and will continue to serve as West Linn’s sole source of emergency and backup water supply.

History of the Water Treatment Plant

Built in 1968, Lake Oswego’s water treatment plant was originally located in unincorporated Clackamas County. The area was later annexed by West Linn. Through its 44-year history the plant has earned a reputation as a good neighbor. The City of West Linn has approved land use applications for upgrades and expansions three times since the plant was built.

It is not uncommon for wastewater and water treatment plants to be located in residential areas. South Fork Water Board’s treatment plant – jointly owned by West Linn and Oregon City – is located in Oregon City’s Park Place neighborhood. Extensive upgrading, expansion and treatment modifications have occurred there over the past several years to serve the two communities.

Water Treatment Plant – Good Neighbor Plan

Lake Oswego Tigard Water Partnership began discussions with the Robinwood Neighborhood Association in early 2010, sharing details of the water treatment plant expansion, listening to suggestions, and finding ways for the upgraded water plant to continue to be a good neighbor. Two years later, the Partnership has met with Robinwood neighbors more than 20 times, developing a Good Neighbor Plan (pdf, 308 kb) that contains the Partnership’s commitments for design–construction–operations of the new facility. Neighborhood input played a big role in design concepts with the addition of numerous plant layout changes and amenities requested by neighbors.


How to Get Involved

  • Click here for upcoming meeting dates.
  • Sign up to receive email notices.  Mark the ‘Water Treatment Plant' as your interest.
  • Click here to contact us by email.
  • Call the Water Hotline (503) 697-6502.

Additional Information

You can find regular updates on the Work Underway page.

Field Updates

Thursday - July 24, 2014

West Linn Pipeline Construction Update: Horizontal Directional Drilling site (end of Mapleton Dr.)

Drilling has been on hold this week while crews wait for a different steering tool to arrive

The pipe casing installation is now complete! Crews installed 60-inch diameter steel casing to about 160 feet. Thank you to neighbors for your patience during this noisy activity.

Drilling of the first pilot hole under the river began last week. The hole is being drilled through rock and is currently installed to about 1,000 feet. To learn more, read Water Savvy #9, Horizontal Directional Drilling (pdf 823 kb).

This week has been a quiet one at the site, as drilling has been on hold. Crews are waiting for a different steering tool (gyroscope) to arrive in the next week. Once the gyroscope is installed, drilling will resume at the site.

During drilling, neighbors may hear noise from the drill rig and an increase in truck traffic. Work hours are 7 a.m. - 7 p.m., Monday through Friday, and Saturdays from 9 a.m. - 5 p.m.

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Friday - July 18, 2014

Water Treatment Plant Construction Update

The thickener equipment for the gravity thickener tank arrived from Salt Lake City this week

This week, crews encased the 48” overflow piping near the chemical building in concrete and began backfilling the trench. The thickener mechanism arrived at the site and will be installed in the gravity thickener tank in the next few weeks. Rebar and in-slab conduit continues to be installed for the chemical and electrical buildings. Walls will soon be complete for the mechanical dewatering building. Crews continue to work on the ballasted flocculation walls and suspended slabs.

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Thursday - July 10, 2014

West Linn Pipeline Construction Update: Horizontal Directional Drilling site (end of Mapleton Dr.)

A drill rig cleans and augurs out material inside the newly installed casing

A drill rig cleans and augurs out material inside the newly installed casing

Pipe casing installation progressing well

The pipe casing work started last week and is progressing well at the HDD site, just north of Mary S. Young Park. The 60-inch steel casing has been installed to about 160 feet, and is almost complete. Thank you to neighbors for your patience during this noisy activity. Crews are now determining if they have reached stable, solid ground (bedrock) before drilling the pilot hole under the river. Additional casing lengths may need to be installed using the pressurized hammer, depending on ground conditions.

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