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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Ave, Suite 613, Portland, OR 97204

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N Delaware Sewer Repair Project

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The City of Portland’s Bureau of Environmental Services is continuing our work to repair and replace critical sewer and stormwater infrastructure. Environmental Services will continue to provide information and updates on construction schedules and activities during the COVID-19 emergency. 

Updated August 31, 2020

Environmental Services – your sewer and stormwater utility – is designing a project to repair 623 feet of deteriorating brick sewer pipe under North Delaware Avenue between North Buffalo Street and North Lombard Street, and a small section of sewer pipe under North Rosa Parks Way at North Delaware Avenue. The project will also repair or replace public sewer connections for 19 properties.

This project will reduce the possibility of costly breaks, leaks, blockages and sewage releases to buildings, streets, streams, and rivers.  


Construction is anticipated to begin in late September 2020 and take about 2 months to complete. The exact start date is not known at this time, but the city’s contractor will provide notice to adjacent properties one to two weeks before construction begins.

Construction Methods  

This project will include both trenchless and trench excavation construction methods: 

  • Cured-in-Place-Pipe Lining (CIPP) to repair the main sewer pipe
  • Sawcutting and jackhammering to install cleanouts in some locations 
  • Digging trenches to replace some sewer service lateral connections to buildings 

Go to to learn more.

Night Work 

Most work will be completed during regular work hours from 7 a.m. to 6 p.m. Monday through Friday, and Saturdays as needed. However, crews will need to work up to three night shifts in order to complete main sewer pipe repairs using CIPP.

During CIPP, crews insert a flexible liner inside the old pipe. The liner is inflated to press the outer portion firmly against th­­­e inside wall of the old pipe. The liner is exposed to heat or ultraviolet light (UV) to “cure” the pipe.  During curing, the liner gradually hardens against the inside of the old pipe forming a rigid, smooth surface that seals cracks and restores the old pipe to near-new condition.

Due to the large diameter of the pipe being repaired near you, it will take about 16 hours or more to complete the CIPP process, allow the liner to fully cure, and to clean up. This will require working from morning into the evening and possibly overnight.  Equipment that will generate noise in the evening and at night includes sewer cleaning trucks, refrigeration trucks that store the liner, compressors, light trucks, generators, pumps, and ventilation fans. Work after dark will require lighting of the work zone. 

What to Expect Before ConstructionSurvey markings

  • Tree Trimming: To accommodate the large equipment needed to complete this project, certified arborists will supervise trimming of street trees and some private trees in the project area. The trimming will remove low branches that are overhanging the street to reduce the possibility of large equipment damaging trees and to help ensure public safety. Limbs over the sidewalk will not be trimmed as part of this project. 
  • Other Pre-construction Activities: Before construction you may also see crews surveying, marking utilities, inspecting sewer lines and bringing equipment and supplies to the project area. Go to to learn more. 

What to Expect During Construction

  • Local Access: Local access to all properties will be maintained, but construction activities may impact or delay normal use of your driveway. Please allow for extra time for our crews to make the area safe before entering or leaving the construction area.
  • Traffic Delays: You should also expect traffic delays in and near the work area. Please observe traffic control signs and follow the directions of flaggers if present.
  • Parking Restrictions: On-street parking will be restricted in and near the work zones to create a safe work environment and to stage equipment and materials.
  • Equipment Storage: Some equipment and materials may be stored overnight on your street, nearby streets, or other public right-of-way areas.
  • Noise, Vibration, and Dust: Construction creates noise, vibration, and dust.
  • Periods of Inactivity: Work will be conducted in multiple phases. A variety of factors, including conditions underground, weather, subcontractor schedules, and availability of materials may cause periods of inactivity. 
  • Maintained Service: Water and other utilities will remain in service during construction.

For More Information

Contact Matt Gough by email or phone 503-823-5352. In your email and voicemail messages, please provide your name, property address, and the project name (Delaware).