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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 October 14, 2019Button. Click to sign up for email updates

Environmental Services is nearing completion of construction on a project to repair public sewer pipes in SW Yamhill and SW Morrison streets in downtown Portland. Repairs to the 100 to 140-year-old, deteriorating sewer pipes will protect the public and the environment by reducing the possibility of sewage releases to buildings and streets.


The remaining pipe work locations in this project include the following:

  • SW Morrison Street between SW 6th Avenue and SW Broadway
  • SW Morrison Street between SW 9th Avenue and SW 10th Avenue
  • SW Yamhill Street between SW 6th Avenue and SW Broadway

Project Map

General Schedule

Construction is anticipated to be completed this fall.

Look-Ahead Construction Schedule

The lining process to repair the sewer pipes cannot be done if there is rain or heavy stormwater flows in the pipes. Although that can be challenging this time of year, the pipe lining process avoids having to dig deep and long trenches in downtown streets to replace whole pipes.

Tentatively Scheduled for the Week of October 28 (weather dependent)

This work was previously scheduled for the week of October 14 but has been re-scheduled for the week of October 28 due to impending rain. Crews will conduct pre- and post-construction video inspections of sewer pipes, install bypass systems, line lateral pipes, and repair the sewer mainline using Cured-in-Place-Pipe Lining at the following location:

  • SW Morrison Street between SW 6th Avenue and SW Broadway

Work Hours Include Night Work

The Portland Noise Office granted Environmental Services a Noise Variance to enable the city's contractors to work both days and nights. Daytime construction hours are from 7 a.m. to 6 p.m. Monday through Friday, and Saturdays as needed. Nighttime construction hours are from 6 p.m. to 7 a.m. Monday through Saturday. Night work reduces traffic congestion, creates a safer work zone, and allows sufficient time for a new sewer pipe lining to harden.

Equipment that generates noise includes sewer cleaning trucks, compressors, light trucks, generators, pumps, and ventilation fans. Night work will also require lighting of the work zone.

Construction Method

To repair the public sewer pipes, the City will use the Cured-in-Place-Pipe Lining (CIPP) method. Working from a manhole, crews insert a flexible liner inside the old pipe. Crews then inflate the liner and use hot water, steam, or ultraviolet light to cure the liner, forming a rigid, smooth surface that seals cracks and restores the pipe to near-new condition.

When heat (steam) is used to cure or harden the liner during CIPP, people who are nearby may smell an odor that is often described as being similar to plastic or glue. The odor is from the chemical styrene, which is in the resin of the liner. The resin is the part of the liner that reacts with heat and hardens.

While unpleasant for some, the amount of airborne styrene generated by the CIPP process is not a health risk at the levels observed by the City of Portland and tested and monitored by an independent industrial hygienist. The odor dissipates quickly once the process is complete.

Phases and Duration of CIPP Work

The CIPP sewer pipe lining process occurs in phases:

  • One day to inspect pipe conditions to confirm construction methods
  • One day to clean the pipe
  • One day to remove roots and debris from the pipe
  • 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

Click here for more details and photos of the CIPP construction method.

What to Expect During Construction

You can expect the following activities and impacts during construction:

  • Work Hours: Regular work hours will be from 7 a.m. to 6 p.m. Monday through Friday, and Saturdays as needed. To complete pipe lining, crews will work both days and nights.
  • Phases of Work: Businesses and residents should expect periods of inactivity between phases of work.
  • Traffic Delays: Expect traffic delays in and near the work area.
  • Temporary Street Closures: Street closures may be required for manhole access and the sewer bypass pumping system. Where needed, local access will be provided by flaggers.
  • Driveway Access: Construction may temporarily block your driveway when crews are working in front of your property.
  • No Parking: Little or no on-street parking will be allowed in and near work zones, especially during work hours.
  • Equipment Storage: Equipment and materials may be stored on streets overnight.
  • Services Maintained: Sewer, water, and other utilities are expected to remain in service during construction.

For More Information

Environmental Services strives to keep residents and businesses informed:

  • Visit this project webpage for updates using the shortcut
  • Sign up now for email updates by clicking the SIGN UP button and selecting SW Yamhill and Morrison Sewer Repair form the dropdown menu.
  • If you have a question about the project, call the hotline at 503-823-5315, stating that Yamhill-Morrison 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 Yamhill-Morrison is your project of concern.
  • Please be sure to include your name, business name, property address, phone number, and project name (Yamhill-Morrison) in your voicemail and email messages.
  • Email city outreach staff
  • In the event of a sewer backup, storm drainage problems, or clogged catch basin, call 503-823-1700 to report the problem and location.

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