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2436 W Lake Sammamish Pkwy SE

April 8, 2021: COBU - Lake Restoration for W Lake Sammamish Pkwy Sinkhole. On November 25, 2019, the City of Bellevue (City) identified an emergency need for repairing/replacing a failed 24-inch-diameter storm drain located at 2442 West Lake Sammamish Parkway SE, Bellevue, WA. In response to the emergency repair order, the City installed temporary bypass pumping to pump stormwater around the damaged pipe section. Heavy preciptiation occurring between December 19 and 20, 2019, resulted in significant stormwater flows that overwhelmed the temporary pumps. This resulted in significant downstream flooding, with water flowing through the pedestrian tunnel under West Lake Sammamish Parkway SE and consequently eroding the downstream hill slope and damaging the community pedestrian beach
access and a neighboring property. Most of the restoration work was completed by late March 2020. In early April, after Lake Sammamish started to recede to summer levels, both property owners reported that there was still a large amount of sediment in the nearshore area of the lake impeding shoreline recreation access; the owners requested the material be removed. Field
investigations by Jacobs revealed that approximately 150 cubic yards of deposited material needs to be removed. This Project will include mitigation improvements for the emergency repair work, including excavating up to 150 cubic yards of mixed fines, rounded gravels, and cobbles to smooth the beach slope so that it matches conditions prior to the sediment deposition from the failed storm drain.

July 19, 2021: Completed.

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