1120 SW 5th Avenue, Room 1000, Portland, OR 97204
Environmental Services is designing a project to repair about 250 feet of 100-year-old public sewer pipe in NW Flanders Street between NW 12th and 11th avenues (see map). This project will reduce the risks of sewage releases to businesses and streets and sewer service interruptions that could occur as a result of pipe collapse.
Construction is anticipated to begin as early as March 2017 and take three months to complete.
The public sewer in NW Flanders Street between NW 12th and 11th avenues was constructed in 1916 and is showing signs of wear and tear, including cracks, tree root intrusion and structural ovalling due to stresses on the pipe.
This project will repair the 100-year-old sewer pipe using a trenchless construction method called cured-in-place-pipe lining (CIPP). 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. For more information about CIPP and photos, click here.
The project will also repair or replace storm drain inlets, manholes and up to 100 feet of service laterals that connect private properties to the public sewer. Open trench excavation will be necessary to complete these additional repairs to the public sewer system.
Historic trolley rails intersect the sewer at NW Flanders and 12th. The project will remove the rails and ties before repairing the public sewer.
During construction of this sewer repair project, Portland Streetcar operations on NW 11th Ave will not be disrupted. The project will keep all lanes on NW 11th Ave open at all times. Traffic on NW 12th Ave may see lane restrictions during work hours, but the street will remain open.
Contact Ashley Tjaden by phone at 503-823-5281 or send Ashley an email with “NWFlanders” in the subject line. Please let us know if you have concerns such as business operations, disability issues, medical or business deliveries, or other concerns about how this project might affect your property. If you provide your property address, we may be able to provide you details about what to expect in construction at your property.
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Learn more about sewer construction methods