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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

MAILING ADDRESS: 1120 SW 5th Ave, Room 1000, Portland, OR 97204

More Contact Info

SW Washington Street: Park Ave to 10th Sewer Repair Project

Updated November 15, 2019

Environmental Services is preparing to construct repairs to a public sewer mainline pipe in SW Washington Street between SW Park Avenue and SW 10th Avenue. This project will protect the public and the environment by reducing the possibility of sewage releases and basement flooding in buildings and streets.

This project is part of the larger Downtown-Old Town Sewer Repair Program managed by Environmental Services to assess the condition of and repair the public sewer system serving Downtown and Old Town Portland. The program represents millions of dollars in investments. Ultimately, these improvements will extend the life cycle of downtown sewer infrastructure by more than 50 years.


The public sewer mainline to be repaired is in the north side of SW Washington Street between SW Park and SW 10th Avenue.

Project Map

Work Hours

In general, work hours are from 7 a.m. to 6 p.m. Monday through Saturday while crews complete pre-construction activities. To reduce public impacts and complete the work as quickly as possible, the actual sewer repair work (to be scheduled in the near future) might be completed at night between 6 p.m. and 7 a.m. Monday through Saturday.

Look-Ahead Schedule

Between now and early November, crews will conduct pre-construction activities before they proceed with sewer repair work. These activities will include the following:

  • Develop traffic control plans and set up approved traffic control signage
  • Inspect mainline public sewer pipes using closed-circuit television cameras
  • Inspect sewer service lateral pipes using closed-circuit television cameras
  • Investigate how adjacent buildings are connected to the public sewer and stormwater system
  • Develop a lateral bypass plan that will provide uninterrupted sewer service to adjacent buildings during sewer repair work
  • Develop a sewer repair construction plan
  • Coordinate with adjacent properties as needed to address any specific property issues and impacts as the project evolves

Survey utility markingsThe temporary bypass system currently set up at the northwest corner of SW Washington Street and SW 10th Avenue is diverting stormwater flows from one mainline pipe to another pipe when it rains to help prevent basement flooding and sewer backups. It will remain in place while the city's contractor completes pre-construction activities and develops a plan to repair public sewer pipes.

The numerous paint markings on the pavement indicate the presence of underground utilities, such as communication cables, water lines, sewer pipes, gas lines, and power lines. To understand what each color means, see the graphic to the right.

The construction schedule has not yet been determined.

Other Construction Projects in the Area

This area of downtown Portland is currently busy with other construction projects not to be confused with this urgent sewer repair project:

  • The Portland Water Bureau is installing a new water main in SW 9th Avenue between SW Alder Street and SW Harvey Milk Street.
  • Construction activity for the Ritz-Carlton hotel is occurring on the south side of SW Washington Street.
  • For information about other downtown sewer repair projects, click here.

Stay Informed

Environmental Services will work directly with the community throughout the course of the project. Community outreach staff will listen to your suggestions and respond to your concerns. We encourage you to:

  • Sign up for email updates by clicking the SIGN UP button and selecting the SW Washington Street: Park Ave to 10th project from the dropdown menu.
  • Visit this project webpage for periodic updates and use the shortcut
  • If you have a question about the project, call the hotline at 503-823-5315, stating that SW Washington is your area of concern. Your call will be returned by the next business day.
  • If you have a nighttime construction noise complaint, call 503-823-1338, stating that SW Washington is your project of concern.
  • Email city outreach staff
  • For a list and maps of other downtown sewer projects, visit

Sewer Emergencies

In the event of a sewer backup or basement flooding, call the Maintenance hotline immediately at 503-823-1700. It is staffed all hours and all days, 24/7.

Project Overview

Including the project description, map and schedule

Community Outreach

Check out current and previous communications about the project