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Mercer Island crews find unrecorded access points, stop Lake Washington overflow after lake‑line blockage
Summary
City crews traced a late‑February blockage between Pump Stations 10 and 11, located previously unrecorded lake‑line access points, jetted and cleared a roughly 150‑foot clog of grease and rags, and restored Pump Station 10; staff plan GIS updates, CCTV inspection of the reach and design‑ready emergency permitting.
City utility staff told the Mercer Island Utility Board on March 10 that a late‑February high‑wet‑well alarm at Pump Station 10 revealed a downstream blockage between Pump Stations 10 and 11 that caused an overflow into Lake Washington. Crews located two previously unrecorded lake‑line access points near Covenant Shores, ran a 1,000‑foot jetter hose and cleared an estimated 150‑foot blockage of grease, diapers and rags. Pump Station 10 was restored to normal operation and the city reported the overflow to King County Public Health, the Washington Department of Ecology and impacted…
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