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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Ave, Suite 613, Portland, OR 97204

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SW Terwilliger at Northgate Sewer Repair

Updated June 21, 2019

Project Delayed Until 2020

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Environmental Services continues to investigate a 350-foot section of sewer pipe that was installed in SW Terwilliger Boulevard in 2017. The section located west of SW Northgate Ave (east of Powers Court and west of Castleridge Lane) is not operating according to bureau standards (see map on back). As a result, the pipe needs additional cleaning and maintenance every two months. This is much more often than we would typically expect maintenance to occur.  We suspect that it may be due to a mix of very soft soils and high ground water at this location causing the pipe to sag, which slows or prohibits sewage from moving through the pipe.

Engineers are exploring different options for addressing the sag in this section of the sewer pipe and need additional time to investigate and design a solution.  As a result, the Bureau will postpone construction of the project until the summer of 2020 at the earliest. We will continue to update the neighborhood as soon as we have come up with a design and plan. Crews will continue to monitor and clean the pipe regularly.

SW Terwilliger at Northgate Project Area Map

For More Information

For more details about the project, check back regularly on the project webpage at If you have questions or concerns, call or email Debbie Caselton at 503-823-2831 or Please include your name and address in your voicemail and email and write “Terwilliger” in the subject line of your email.