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Mercer Island water-supply pipeline update: design 60% complete; construction expected 2026–27
Summary
Council heard an update on the city’s water supply pipeline project: 60% design complete, an estimated water-only construction cost of $12.5–13.5 million, about 5,000 feet of new 24-inch pipe proposed and a projected construction window from Feb. 2026 to April 2027, with roadway work to follow.
Mercer Island staff told the City Council on Oct. 21 that the city’s water supply pipeline project is at roughly 60% design and is on track to finish design in February 2026, with water-main construction anticipated to begin in 2026 and run through mid-2027.
The project would install about 5,000 linear feet of new 24-inch ductile iron pipeline along a new alignment on Southeast 36th and Gallagher Hill, replace approximately 1,500 feet of asbestos-cement (AC) main on Gallagher Hill, and provide a new city-owned supply connection that would change how Shorewood receives potable water. “We are using a design–construction alternative process with a contractor at the table early,” project staff said; Scarcella Construction is participating on the design team, staff added.
Staff said the water portion of the project currently carries an estimated cost of $12.5 million to…
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