Skip to Main Content View Text-Only

To improve security, on Feb. 11th the city will begin disabling TLS 1.0 on our websites. This change should not impact you unless you are using an old browser. More information


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 Yamhill-Morrison Sewer Repair Project

Updated February 9, 2018Button. Click to sign up for email updates

Environmental Services is resuming work to repair public sewer pipes in SW Yamhill and SW Morrison Streets in downtown Portland. 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.

Construction is expected to begin February 5 and may continue through May, with work at each location taking less than a week.


SW Yamhill-Morrison project map


Below is the anticipated work schedule at this time. At each location, the city’s contractor expects to work during the day and extend overnight into the next day.

  • February 5 – SW Yamhill between 12th and13th – Completed
  • February 6 – SW Yamhill between 9th and 10th – Completed
  • February 7 – SW Yamhill between Broadway and Park – Extended an additional day and night due to roots in the pipe
  • February 8 – SW Yamhill between Broadway and Park – Nighttime lining continues
  • February 9 – SW Morrison between Broadway and Park
  • February 10 – Remove bypass
  • February 12 – SW 5th between Taylor and Yamhill
  • February 13 – Remove bypass
  • Through February, there will be minimal impacts as the contractor cleans and prepares sewer lines for pipe lining to begin again in March.

Construction schedules are dependent on weather and other factors. There is currently some chance of rain in the forecast, so this schedule may change. Rain causes increased stormwater in the pipes, which makes it more difficult or impossible to bypass the combined sewage and stormwater flows in order to repair the pipes.

What to Expect

Daytime work includes sending a camera into the pipe, cleaning the pipe, and then setting up the bypass service that will provide uninterrupted sewer service. In the early evening, the pipe lining begins and extends to the next morning as the new lining hardens in place. Then the service laterals to buildings are reinstated and the bypass is removed. Crews will generally be at each site for about 2-3 days with a full night of activity lining the pipe.

Traffic control areas and bypass set-up will extend beyond the pipe repair locations.

Additional pipe work for the project will be scheduled after these have been completed and the weather forecast looks clear.


This past spring, Environmental Services completed Phase One of the downtown public sewer repairs, in coordination with TriMet's MAX Improvement Project. TriMet's project gave us a rare chance to repair about 3,200 feet of underground sewer pipes that cannot be accessed while tracks are in service. We have more work to do to ensure a high quality public sewer system. This next phase of work will not affect MAX light rail service.

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 for this project. Pipe lining work will take 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 setup and pipe cleaning work will occur during the day. 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 will employ 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 will be 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 will be in place for up to several hours at a time.

Phases and Duration of CIPP Work

The CIPP sewer pipe lining process will occur in phases:

  • One day or night to set up the bypass service that will provide uninterrupted sewer service to adjacent buildings
  • 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 and other factors, including 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.

  • Temporary street closures in the work zones shown in the project map will last approximately three days each as crews move from location to location to repair the sewer.

  • Staging areas for materials and construction vehicles will be on most cross streets and will 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.

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

Stay Informed

Sign up for email updates and other project notifications