430 Pipeline Improvement Project

Project Description

Construction work on pipeline improvements

The 430 Pipeline Improvement project will repair and upgrade portions of the large 42-inch diameter steel pipeline that runs four miles from Volunteer Park to Maple Leaf Reservoir in Seattle. The pipeline was built in the early 1900s and is part of the region’s drinking water system.

Location

Construction for the 430 Pipeline Improvement project occurs inside of the underground pipe and above ground at multiple worksites (about 12) in the Maple Leaf, Ravenna, University District, Eastlake, and Capitol Hill neighborhoods.

What's Happening Now?

September 28, 2022 Update:

Crews continue to perform water system work to prepare the 430 Pipeline to be taken out of service, drained, and repaired.

Roosevelt: Excavation work on 12th Ave NE near NE 75 St to install an access hatch to the 430 Pipeline continues. Construction at this site is expected to last for several weeks. Crews will return to the site periodically to access the pipeline for cleaning and repair work.

Excavation work on 12th Ave NE near NE 62 St begins on October 4. Crews will work at this site for several weeks to install an access hatch for the 430 Pipeline and will return to this site periodically to access the pipeline for cleaning and repair work.

Ravenna: Paving to permanently restore the roadway at NE 54th St and Ravenna Ave NE begins on October 1 and will last until October 6. During this time, the northbound lane on Ravenna Ave NE will be closed around-the-clock to allow the pavement to cure. A public notice to the neighborhood and a traffic advisory have been issued.

Maple Leaf: Excavation work to allow access to the pipeline continues at the Maple Leaf Reservoir Park gate house, located at 1020 NE 82nd St. A fence in the grassy area directly outside of the gatehouse has been installed to allow crews and park users to remain safe during construction.

Capitol Hill: Curb and street restoration work at Federal Ave E. and E. Miller Street, and Federal Ave E. between E. Boston St and E. Newton St, is complete. Crews will return later to complete vegetation restoration work.

Portage Bay: Work on and below the University Bridge at Portage Bay Place East to remove debris and fill a utility chamber with concrete is complete. Crews will return to the Portage Bay site periodically to access the pipeline for cleaning and repair work.

Community Benefits

The 430 Pipeline is a part of the region’s drinking water system. The improvement project will:

  • Increase the resiliency and reliability of Seattle’s drinking water system
  • Provide safer access to the pipeline
  • Protect against pipe erosion
  • Increase seismic resiliency
  • Improve fire suppression support
  • Add system redundancy
  • Provide greater pressure reducing and pressure relief capabilities

Community Engagement

SPU is committed to providing timely information and updates on project activities. Updates may be available in multiple formats, including: the website, emails, and/or mailings. If you are interested in receiving email updates, please subscribe to the project email list.

Construction Schedule

May 2022 - December 2023