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City of Bellevue, WA Transportation
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148th Avenue Southeast at Larsen Lake Flood Mitigation

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  7. 148th Avenue Southeast at Larsen Lake Flood Mitigation
Larsen Lake

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    Capital Projects

    • 114th Avenue SE/ SE 8th Street - Complete Streets
    • 148th Avenue SE at Larsen Lake Flood Mitigation
    • 150th Avenue SE Mobility Project
    • Bellevue College Multimodal Connection
    • Bellevue Transit Center Raised Intersections
    • Coal Creek Parkway Safety Improvements
    • Eastrail Multi-use Corridor
    • Eastrail to NE 12th Street Trail Connection
    • Grand Connection Crossing
    • Mountains to Sound Greenway Trail
    • West Lake Sammamish Parkway Phase 2
    Header Image
    Larsen Lake

    This project aims to reduce the frequency of flooding on 148th Avenue Southeast between Southeast Eighth Street and Main Street. Currently, the project team is performing engineering studies and evaluating options to develop a design that reduces or eliminates roadway flooding in the project area. Proposed solutions will also consider the effects on habitat and fish passage, drainage flow improvements, maintenance and cost-effectiveness. 

    The City of Bellevue and King County are working together to develop and implement a future design to provide healthier stormwater drainage between Larsen Lake/Lake Hills Greenbelt and Upper Kelsey Creek.

     Project area map

    148th Avenue Southeast at Larsen Lake Flood Mitigation project area map
    Click to enlarge image

     

     

     

     

     

     

     

     

     

     

     

     

    Background

    Following moderate to heavy rain or long rain events, 148th Avenue has been fully or partially closed by the city due to high water levels on numerous occasions between Southeast Eighth Street and Main Street.

    The 148th Avenue corridor is the only major north-south arterial roadway in East Bellevue, a federally designated truck route, and a critical commuter and emergency services access route between Interstate 90 (I-90) and State Route 520 (SR 520) with an average daily traffic over 33,000 vehicles. 

    During closures, adjacent corridors, including residential areas with limited vehicle capacity, have been impacted. Flooding also threatens nearby parklands, blueberry fields and residences. 

    The city will reduce negative impacts in the project area through the planned mitigation measures by reducing the recurrence of flooding, and preventing further roadway sinkage and culverts from warping.

    • Schedule

      October 2023:
      Complete conceptual design
      August-September 2023:
      Evaluate alternative designs and develop a conceptual design to move forward with comprehensive engineering design.
      2022:
      Received funding from the King County Flood Control Zone District to initiate preliminary design.
      2018:
      Completed initial study to investigate the source and impacts of roadway flooding.

    Funding

    Funding for the project comes from the city’s Capital Investment Program and the King County Flood Control Zone District. The estimated cost of preliminary engineering is $600,000.

    The city is working with the King County Flood Control Zone District to secure funding for the design phase. 

    Background material

    • Alternative 1
    • Alternative 2
    • Alternative 3 (Preferred) 
    • Alternative Analysis Report (December 2023)
    • Engaging Bellevue Online Open House (October 2023)
    • Project update mailer (August 2023)

    Transportation

    Jun Suk An, PE
    Project Manager

    Telephone
    425-452-4230
    Email
    jan@bellevuewa.gov
    Social Media

    Reasonable Accommodation

    For alternate formats, interpreters, or reasonable modification requests please phone at least 48 hours in advance 425-452-6800 (voice) or email servicefirst@bellevuewa.gov. For complaints regarding modifications, contact the City of Bellevue ADA, Title VI, and Equal Opportunity Officer at ADATitleVI@bellevuewa.gov.

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