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Unplanned Water Shutdown and Traffic Impact

A water main break occurred overnight at 154th Ave. SE and SE 4th St. and crews are actively working to repair and restore service. Flaggers and detour routes are in place during the repair work. 

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  7. Somerset Reservoir Decommissioning Project

Somerset Reservoir Decommissioning Project

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    Archived - Utilities Capital Projects

    • Factoria Boulevard Stormwater Conveyance
    • Horizon View 2 Reservoir and Pump Station Project
    • Kelsey Creek/Lake Hills Culvert Project
    • Newport Sewer Basin Capacity Improvements
    • Pikes Peak Reservoir Replacement
    • Sewer Capital Investment Projects
    • Somerset Reservoir Decommissioning Project
    • Stormwater Capital Investment Projects
    • Valley Creek Culvert Replacement and Stream Restoration Project
    • Water Capital Investment Projects
    • Watershed Management Plan
    • West Operating Area Reservoir Study

    The Somerset Reservoir No. 1 is a 100,000-gallon reinforced concrete reservoir, built in 1961 and located on Somerset Recreation Club property. The existing structure of the reservoir was created by excavating into the original slope, meaning that the current structure is partially tucked into the hillside. The reservoir has been out of service for nearly 20 years.

    To improve the safety of the Somerset Recreation Club in the event of an earthquake and enhance the views from the pool deck, the reservoir was further stabilized and partially removed, and the hillside was regraded and landscaped.

    Project Area

    Map of Somerset Reservoir Decommissioning Project work area

    Project approach

    At a workshop held in December of 2019, the City reviewed risks and opportunities associated with possible design alternatives for the project.

    When choosing the most feasible design alternative, the City weighed several factors including:

    • Feasibility of the alternative
    • Constructability
    • Cost, and
    • Level of impact to the Somerset Recreation Club

    The selected design alternative to decommission the reservoir is the most feasible option with the least impact on the Somerset Recreation Club. This alternative included stabilizing the reservoir east wall and the soil behind it with steel braces and installing structural fill to replace the weight of the reservoir roof and walls.

    The reservoir roof and walls, except the east wall, were carefully demolished and removed. The remaining reservoir structure was buried and the hillside was regraded and landscaped. The project was completed in the Spring of 2023. The graphic below provides an overview of the project design.

    Somerset Reservoir project site plan

     

    Resources

    • City of Bellevue - Preliminary Engineering Design Report for Reservoir/Seismic Evaluation

    Contact

    Dwight Smith, PE, SE, PMP
    Senior Engineer & Project Manager

    Telephone
    425-452-4127
    Email
    dbsmith@bellevuewa.gov
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