430 Pipeline Improvement Project

Project description

The 430 Pipeline Improvement Phase 2 project will repair and upgrade portions of the large steel water 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.

The first phase of the project (“Phase 1”) included water system upgrades, the installation of 14 new pipe access points, and rehabilitation of 30% of the pipeline. Phase 2 will continue the work started in Phase 1 by rehabilitating the remaining 70% of the pipeline. The majority of the work for Phase 2 will be underground; however, crews will be installing new pipeline access points and staging construction equipment at the road surface.

Location

Construction for the 430 Pipeline Improvement Phase 2 project will occur inside of the underground pipe and requires staging equipment above ground at multiple work sites.

Work will take place at several locations along the pipe alignment in the Maple Leaf, Roosevelt, University District, Portage Bay, and Capitol Hill neighborhoods. View the pipe alignment map for the approximate location of the underground pipe.

What's happening now?

Construction for the 430 Pipeline Improvement Phase 2 project is anticipated to begin as soon as mid-October 2024. Construction notices for each site will be mailed to adjacent neighbors prior to work starting. Water service will be maintained throughout construction.

Community benefits

The 430 Pipeline Improvement Project is a part of the region’s drinking water system. Phase 2 of the project will:

• Increase the resiliency and reliability of Seattle’s drinking water system
• Protect the pipeline against corrosion

Community engagement

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