430 Pipeline Improvement Project

Dec 11, 2023

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.

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.

January 4, 2023 Update:

Contracting crews continue to perform construction activities as a part of the 430 Pipeline Improvement project. This work includes crews entering and exciting the pipeline through maintenance holes and utility hatches that have been installed to access the pipeline for cleaning and repair. This activity is taking place periodically in several neighborhoods in North Seattle:

University District:

Roosevelt:

Ravenna:

Maple Leaf:

Capitol Hill:

Portage Bay:

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

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.

May 2022 - December 2023