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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

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SW Yamhill-Morrison Sewer Repair Project

Updated December 10, 2018Button. Click to sign up for email updates

Phases One and Two Completed

Phase Three To Be Scheduled in 2019

In the spring of 2017, Environmental Services completed the first phase of sewer repairs on public sewer pipes in SW Yamhill and SW Morrison streets in downtown Portland. In the fall of 2018, Environmental Services completed a second phase of work to repair public sewer pipes that were in deteriorating condition. 

Phase Three sewer repairs are expected to be scheduled for sometime in 2019. Originally scheduled for the fall of 2018, the repairs had to be postponed due to several factors, including the challenging nature of the pipes, difficult access issues, and availability of subcontractors and materials.

Repairs to the 100 to 140-year-old sewer pipes will protect the public and the environment by reducing the possibility of sewage releases to buildings and streets.


This map shows the sewer repair locations for the SW Yamhill-Morrison Sewer Repair Project.

SW Yamhill-Morrison project map


Repairs to the remaining pipes (labeled as FALL 2018 on this map) will restart sometime in 2019. Environmental Services will notify property owners, businesses, and residents in the project area when the work is scheduled.

Repairs at each location should take less than a week, with a combination of daytime and nighttime work approved by the Portland Noise Office. TriMet light rail service will not be affected.

What to Expect

Daytime work includes videotaping the pipe, cleaning the pipe, and doing small repairs. Crews also set up the bypass service that provides uninterrupted sewer service to all buildings. The pipe lining work begins in the early evening and extends into the next morning as the new lining hardens in place. Then crews reinstate the service laterals to buildings and remove the bypass.

Traffic control areas and bypass set-up usually extend beyond the pipe repair locations, which can affect traffic on neighboring streets slightly.

Work Hours

The Portland Noise Office granted Environmental Services a Noise Variance to enable the city's contractor to work at night to repair the public sewer pipes at these locations. Pipe lining work takes place after 6 p.m. and before 7 a.m. to reduce traffic congestion, create a safer work zone, and allow time for the new sewer pipe lining to harden. Some work occurs during the day both before and after the pipe lining. The city's contractor may work on weekends as needed.

Cured-in-Place-Pipe Lining (CIPP)

To repair the public sewer in the locations shown on the map, the city employs a process called Cured-in-Place-Pipe Lining (CIPP). Work crews access the sewer from manholes to insert a flexible liner inside the old pipe. Steam or ultraviolet light inflates and cures the liner, which gradually hardens to form a rigid, smooth surface that seals cracks and restores the pipe to near-new condition.

People who live and work near a CIPP repair project can sometimes smell a chemical odor during the pipe-lining work. The odor is from the chemical styrene, which is in the resin liner installed inside the pipe. The odor dissipates quickly once the installation process is complete. The amount of airborne styrene produced by the lining process is not expected to cause health issues for workers or the public. Click here for more details about CIPP.

Vactor trucks are in the area to operate vacuum pumps necessary to clean the pipes prior to the lining and maintain sewer service during the lining. Vactor trucks generate noise and can be in place for up to several hours at a time.

Phases and Duration of CIPP Work

The CIPP sewer pipe lining process occurs in phases:

  • One day or night to set up the bypass service that provides uninterrupted sewer service
  • One day or night to line the sewer pipe and cure the lining so it hardens in place
  • One day or night to reinstate the service lateral connections and remove the bypass service

The CIPP work requires dry conditions to complete, so the schedule may fluctuate due to weather, conditions underground, traffic impacts, subcontractor schedules, and availability of materials.

Traffic Impacts

You can expect traffic delays, temporary lane closures, on-street parking removal, pedestrian detours, nighttime street closures, and flaggers as needed in the work zones. MAX light rail service will not be affected.

  • Accessing sewer pipes through manholes requires temporary street closures of one-to-two-block segments.
  • Where needed, local access is provided by flaggers.
  • Access to and from driveways may be delayed.
  • Staging areas for materials and construction vehicles are on cross streets and require some lane closures and parking removal.
  • Bypass pumping to maintain sewer service during construction may require temporary sidewalk closures and pedestrian detours with local access provided by flaggers.
  • To avoid circling around construction to find parking, the city recommends you use SmartPark garages; those near our construction zone are included on the project map.

For More Information

If you have a question or concern, call the project hotline at 503-823-5315, leave a message, and your call will be returned by the next business day.

  • Visit this project webpage for updates using the shortcut
  • Sign up for email updates by clicking the SIGN UP button above and selecting SW Yamhill and Morrison Sewer Repair form the dropdown menu
  • Call the Portland Noise Office at 503-823-7350 to report concerns about nighttime construction noise
  • Email city outreach staff

If you have a concern or question about a pipe repair near you, please be sure to include your name, business name, property address, phone number, 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.

Downtown Open for Business

Environmental Services coordinates with multiple agencies to schedule and complete construction, minimize disruptions, and help people get to where they are going. Learn about other projects that affect the Central Business District at To avoid circling around construction to find parking, the City recommends you use SmartPark garages.

Project Overview

Including the project description, map and schedule

Community Outreach

Check out current and previous communications about the project