Aging sewer pipes to be replaced on Mercer Island, Enatai in Washington
(UI) — The North Mercer Island/Enatai Sewer Upgrade Project is set to replace aging sewer pipes serving North Mercer Island, Bellevue near Enatai Beach, and the Town of Beaux Arts Village.
The project will update pipelines that carry wastewater from the North Mercer Island pump station to the Sweyolocken pump station in Bellevue, ensuring reliable sewer service for at least 50 more years.
To minimize community impact, the project has been divided into eight distinct areas. On Mercer Island, crews are working at the North Mercer Pump Station, where intermittent single-lane traffic may occur due to deliveries. Pipe repairs are also underway on 78th Avenue Southeast, Southeast 24th Street, and 81st Avenue Southeast, with flaggers directing traffic as needed. North Mercer Way has seen completed pipe installation and paving, including new accessible curb ramps.
The I-90 Trail, closed between Southeast 26th Street and Shorewood Drive, is undergoing pipe testing and restoration, with paving planned for mid-September. A detour is in place to guide trail users around the work zones. Crews are also paving Shorewood Drive and working on infrastructure improvements along 90th Place Southeast. The Fruitland Landing Park is closed while crews upgrade Lift Station 11 and reline existing pipes. Paving in various locations, including Southeast 35th Place and areas near the I-90 trail, is expected to start mid-September.
On Bellevue’s side, the project includes shoreline restoration along Enatai Beach Park, work on sewer pipes near the swim beach, and upgrades near the I-90 bridge. Paving efforts on 108th Avenue Southeast are causing temporary road closures and detours, expected to continue through September. The Sweyolocken boat launch and Mercer Slough connector trail are open for public use, with paving scheduled to start soon.
The ongoing upgrades, which began in the 1980s, are a critical investment in the region's infrastructure, enhancing the efficiency and safety of the sewer system for the decades ahead.
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