The City is installing a new water supply pipeline to improve the overall resiliency of the City’s water system. The new water supply line will replace a section of the aging Seattle Public Utilities transmission line that currently serves Mercer Island by delivering water to the City’s reservoirs. The new water supply line will be fully owned and operated by the City. See the Project Map here.

In addition to the new water supply line, this project includes improvements to other City infrastructure in the same corridor including replacement of an asbestos-cement (AC) watermain, roadway paving and sidewalk enhancements. Combining these improvements into one project improves project efficiency, scheduling, reduces costs and overall construction impacts.

Follow this page for details of the design and construction of the new water supply pipeline, as well as neighborhood and traffic impacts through the project.

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