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Design-build SR520 Evergreen Point Floating Bridge and Landings

Seattle, WA

PROJECT FEATURES

    • Design-build
    • Floating Marine Structure
    • 77 concrete pontoons make up the bridge, the largest measure 75 ft. by 360 ft. and weigh 11,000 tons
    • 58 anchors secure the bridge

AWARDS

    2016 | Design Build Institute of America (DBIA) | National Excellence in Design Engineering Award
    2017 | American Council of Engineering Companies (ACEC) | “Grand Conceptor” Award
    2017 | Association of General Contractors (AGC) | Build Washington-Excellence in Innovation Award
    2017 | Washington Aggregates & Concrete Association | Excellence in Concrete Construction – Grand Award
    2017 | Washington Aggregates & Concrete Association | Excellence in Concrete Public Works – Bridges
    2017 | American Bridge Segmental Institute | Award of Excellence Design Category
    2018 | International Road Federation | Global Achievement Award – Construction Methodology

PROJECT PURPOSE

Named the world’s longest floating bridge by Guinness World Records at the time of its opening, this bridge is an important transportation link providing a safe and efficient route across Lake Washington.

This project was performed as a joint venture and involved replacing the existing floating bridge with a new six-lane, 1.4 mile-long concrete floating bridge. The bridge was constructed with watertight pontoons, connected end-to-end, held in place with heavy steel cables anchored to the lake bottom, and a roadway added on top.

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