Sewer cleaning and temporary lane closures on NE 100th Street, 1st Ave NE, and 5th Ave NE

Seattle Public Utilities

Seattle Public Utilities (SPU) will clean a main drainage line in the area of the Thornton Creek Water Quality Channel and the Northgate Transit Center in preparation for Sound Transit’s Northgate Link Extension construction and other future development. This is a proactive approach to protect Thornton Creek and improve the integrity and capacity of the drainage system.


Preparation work lasting 1-2 days will occur at the intersections of 1st Ave NE/ NE 100th St., and 5th Ave NE/NE 103rd St. For the remainder of the project, SPU’s contractor will access the pipe from maintenance holes along NE 100th Street, within the Thornton Creek Water Quality Channel, and along 5th Avenue NE.


The project is expected to begin the week of August 11 and take approximately 3-4 weeks to complete. Normal work hours will vary between 7 a.m. and 4 p.m., Monday through Friday.


  • Temporary lane closures on 1st Ave NE, 5th Ave NE and NE 100th St.
  • Temporary loss of some on-street parking.
  • Increased noise from water pumps, trucks, and cleaning equipment.