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Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Avenue, Room 1000, Portland, OR 97204

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SW Yamhill-Morrison Sewer Repair Project

Updated June 5, 2017Button. Click to sign up for email updates

Environmental Services has completed this phase of a project to repair 100- to 140-year-old public sewer pipes in SW Yamhill and SW Morrison Streets in downtown Portland that were in deteriorating condition. The repairs will protect the public and the environment by reducing the possibility of sewage releases to buildings and streets.

SW Yamhill-Morrison project map

Project Accomplishments

Environmental Services set out to do a large-scale sewer repair project in a short amount of time. TriMet’s MAX Improvement Project gave us the rare chance to work on underground sewer pipes that cannot be accessed while overhead high-voltage power lines are live and light rail trains are running.

In the three weeks that light rail was out of service, the city’s contractor was able to accomplish the following repairs and address immediate needs to extend the life span of sewer pipes in the project area:

  • Inspected 4,500 feet (0.85 mile) of mainline public sewer pipes and service laterals
  • Cleared roots and flushed debris from approximately 4,500 feet (0.85 mile) of public sewer pipes and service laterals
  • Installed 3,200 feet (0.6 mile) of cured-in-place-pipe lining to repair mainline public sewer pipes
  • Investigated over 30 public service laterals to locate where adjacent buildings are connected to the mainline public sewer
  • Installed 25 sewer cleanouts to provide bypass sewer service during the pipe lining process and to provide access for future sewer maintenance activities

Environmental Services appreciates the cooperation and patience shown by downtown businesses, residents, and the visiting public during this process. In addition, the project team gathered valuable technical information in talking with property managers within the project area, and this information will be used to inform future work in the downtown core.

Remaining Work

Minor project-related repairs, such as sidewalk restoration, brick restoration in intersections, and project area cleanup are continuing. With the Rose Festival Moratorium restricting downtown construction through June 12, some minor repairs will be completed after the Moratorium.

Nine areas in this project were identified as high risk, where crews were not able to safely bypass sewage flows from adjacent buildings to repair the mainline public sewer pipe within the three-week construction window. Environmental Services will work with contractors to determine how to complete those repairs in the future.

While the majority of the project was able to be accomplished in the short time period, some future work will be necessary to ensure high quality infrastructure for our community, including:

  • Repairing mainline public sewer pipes in challenging locations not repaired with this project
  • Determining how to bypass sewer flows in challenging locations for future repairs
  • Repairing public service laterals to adjacent buildings on SW Yamhill and SW Morrison Streets
  • Working with private properties to determine potential private plumbing modifications necessary to complete public sewer repairs

Some of this work may occur within the next year. Work that can wait and can benefit from the lessons learned in this project may be included in longer term planning to reduce the impacts on the surrounding community.

For more information

If you would like more information about the project or have questions and concerns you’d like to discuss, please call or email:

Cheryl Kuck
Community Outreach
Phone: 503-823-7898

Please include your name, property address and project name (SW Yamhill-Morrison) in your voicemail and email so we can provide you more details about what to expect in front of your property. Also, please write "SW Yamhill-Morrison" in the subject line of your email.

Project Overview

Including the project description, map and schedule

Community Outreach

Check out current and previous communications about the project

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