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

SW Yamhill-Morrison Sewer Repair Project

SW Yamhill-Morrison Sewer Repair Project

Construction Update

Environmental Services is nearing completion of this phase of the project to repair about 6,500 feet of public sewer pipes in SW Yamhill and SW Morrison Streets between SW 1st and SW 13th Avenues in downtown Portland that are 100 to 140 years old and in deteriorating condition. The urgent repairs will protect the public and the environment by reducing the possibility of sewage releases to buildings and streets.

To view the project map, visit the webpage at


Sewer repairs continue 24/7, all hours and all days, through May 20, with the most challenging work being coordinated with TriMet’s MAX improvement project that began on April 30. Learn more about TriMet’s project at Some minor project-related repairs, such as sidewalk restoration and lateral pipeline work, may continue past the sewer repair completion date of May 20.


The project is now in the Cured-in-Place-Pipe Lining (CIPP) process. Crews are accessing the sewer from manholes to insert new linings inside the old pipes. The liner will gradually harden over several hours to seal cracks and extend the lifespan of the pipes.


The CIPP sewer pipe lining process occurs in the following phases:

  • One day or night to set up the bypass service to 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 scheduled work may fluctuate due to weather and other factors, including conditions underground, traffic impacts, subcontractor schedules, and availability of materials.

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.


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. See for more details about CIPP. In the event of a sewer backup, storm drainage problems or clogged catch basins, call 503-823-1700.


Expect traffic delays, temporary street closures, lane closures, traffic control signage, and flaggers as needed within the work area.

  • There will be rolling two-block closures along Yamhill and Morrison streets, and on SW Stark Street between Naito and 1st, that will last approximately three days each as crews move from manhole to manhole along the corridor 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 cross-street closures with local access provided by flaggers.
  • Where possible, bypass pump lines will be covered by ramps at intersections to enable through traffic, but traffic over the ramps will be slowed by flaggers for safety.
  • For details about ongoing activities and impacts to expect during construction, read the Project Overview on the SW Yamhill-Morrison project webpage.



An approved Noise Variance enables the city’s contractors to work all hours and all days in order to condense several months of urgent sewer repairs into just nine weeks. Environmental Services asked for this variance to take advantage of the three-week closure of TriMet’s MAX line, giving city crews a window to safely access sewer pipes under the tracks.


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 the project webpage at

-        Sign up for email updates on the project webpage.

-         To report concerns about nighttime construction noise, call the noise hotlines at 503-823-8458 or 503-823-8263.

-        Email city outreach staff at

Please include your name, business name, location, and phone number in your phone and email messages so we can provide you more details about what to expect in front of your business. Write “SW Yamhill-Morrison” in the subject line of your email.


Environmental Services is coordinating with multiple agencies to schedule and complete construction, minimize disruptions, and help people get to where they are going. Learn about other projects that will affect the Central Business District at 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.

We continue to encourage businesses in the project area to complete the Downtown Business Sewer Questionnaire to help us understand your sewer connections, business operations and needs, and identify your emergency contacts. Please visit to complete the questionnaire.


Cheryl Kuck

Community Outreach

City of Portland Environmental Services

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

Phone: 503-823-7898   


Working for clean rivers

Over one-third of Portland's 2,500 miles of sewer pipes are more than 80 years old. Projects to replace or repair aging sewers are important for protecting water quality, public health and the environment. Learn more at

The City of Portland complies with all non-discrimination laws including Title VI (Civil Rights) and Title II (ADA). To request a translation, accommodation or additional information, please call 503-823-7740, or use City TTY 503-823-6868, or Oregon Relay Service: 711