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

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Humboldt Sewer Repair Project Update: July 14, 2017

Humboldt Sewer Repair Project Update: July 14, 2017


Cured-in-Place Pipe-Lining (CIPP) is scheduled to continue in multiple locations.

  • This work is expected to be completed during normal construction hours, but evening work may be needed to allow the liner to fully cure. Please read below for more information about potential night work to complete the CIPP construction process.
  • Below are the scheduled locations for CIPP construction July 17-21:
    • Michigan Avenue between Holman and Ainsworth
    • The Commercial/Haight alley between Jarrett and Killingsworth
    • Additional locations may occur next week. Residents next to each location will be notified 24 to 48 hours before CIPP lining takes place.

Crews will continue spot repairs, cleanout installation, and lateral sewer pipe construction in multiple locations.

  • These smaller phases are being completed to prepare for Cured-in-Place Pipe Lining (CIPP) that will begin next week and continue in throughout the summer.
  • The contractor will continue to apply temporary pavement to areas excavated for spot repairs. Final trench paving and concrete restoration work of these areas will occur as crews become available.


While most work as part of the Humboldt Sewer Repair project can be completed during normal daytime construction hours, Environmental Services received a noise variance to allow extended construction hours to complete main sewer pipe repairs using the Cured-in-Place Pipe-Lining method (CIPP).

During CIPP repairs, work crews access the sewer from manholes to insert a flexible liner inside the old pipe. Hot water or steam 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. Once crews begin CIPP construction they must continue the process until the liner is fully cured, which may require working late into the evening at some locations.

In some cases, where water usage by businesses, apartment buildings, and schools creates heavy flow in sewer pipes, crews must begin the process in the evening and work overnight when less water is being used. Large amounts of water coming into contact with the liner impair the curing process.

To view a map of potential CIPP night work locations go to


Visit the project web page at

or contact Matt Gough at 503-823-5352 or

Thank you for your cooperation during this project. Please let us know if you have questions or concerns such as effects on business operations, medical or business deliveries, the need for help with access for people with disabilities, or other concerns. We appreciate your communication and want to hear from you.



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Matt Gough

Community Outreach

City of Portland Environmental Services

1120 SW 5th Ave, Room 1000

Portland, Oregon 97204

Phone: 503-823-5352 l Cell Phone: 503-823-6622


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