Sammamish Plateau Diversion

Project update

August 21, 2024

Our team is preparing for field work in the project area this fall. During this work, the project team will be drilling along East Lake Sammamish Parkway Northeast to sample soil and install groundwater monitoring wells. This will help us better understand the conditions under the road.

This work requires temporary single-lane and turn-lane closures on East Lake Sammamish Parkway Northeast between Northeast 49th Place and Northeast Inglewood Hill Road between 9:30 a.m. and 3:30 p.m. Work hours are between 7 a.m. and 8 p.m., Monday through Friday. If you live nearby or travel through the area, you can expect minor traffic delays.

During this work, flaggers will direct travel throughout the area. The contractor will maintain local and emergency access. Flaggers will treat school buses as an emergency vehicle to reduce delays.

The City of Sammamish has approved the permit for King County’s project team to begin this work, and final schedule details are being confirmed. We expect this work to take place in September or early October for about two to three weeks, depending on field conditions. We will send listserv updates with more information when the work schedule is finalized.

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