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Building inclusive, safe and livable neighborhoods and communities.

ONI Main: 503-823-4519

City/County Info: 503-823-4000

TDD: 503-823-6868

1221 SW 4th Ave, Suite 110, Portland, OR 97204

SW Terwilliger Boulevard Sewer Project Update: June 15, 2017

SW Terwilliger Boulevard Sewer Project Update: June 15, 2017


  • Construction is nearly complete. The construction team now estimates that SW Terwilliger Boulevard will likely be open in July.
  • SW Terwilliger will remain closed to complete the remaining work: install the final residential service connections to properties, disconnect properties from a failing pump station, tests and quality control for the finished pipe, and restoration of streets impacted from excavation and construction.
  • Paving is dependent on a window of dry weather. The contractor may work until up to 10 p.m. when traffic volumes are low for pavement quality.

Please be aware that schedules are subject to change due to a variety of factors, including conditions underground, weather, traffic impacts and subcontractor and materials availability.


In December 2016, Environmental Services began construction on a project to install 7,600 feet of eight-inch sewer in SW Terwilliger Boulevard from SW Northgate Avenue to Highway 43. Originally, Environmental Services estimated that the work could take up to eight months, but the construction team now predicts work will be complete one month early, and SW Terwilliger will likely be open in July. The new Terwilliger sewer will connect to the 30-inch Tryon Interceptor sewer, which carries sewage to the Tryon Creek Wastewater Treatment Plant in Lake Oswego. This improvement to the wastewater collection system will help protect water quality, public health, and our environment.

For progress photos, additional information, and maps, visit


With questions or comments, please contact Debbie Caselton, 503-823-2831

Thank you for your cooperation during this important sewer project.

Debbie Caselton
Community Outreach
City of Portland Environmental Services
1120 SW 5th Avenue, Room 1000, Portland, OR 97204
Phone: 503-823-2831

Working for clean rivers

The Bureau of Environmental Services works with Portland residents and businesses to protect water quality, public health, and the environment through wastewater collection and treatment, sewer construction and maintenance, stormwater management, and stream and watershed restoration. Learn more at

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