SR 520 Floating Bridge

The SR 520 Floating Bridge and Landings project in the Pacific Northwest region of the United States, centered around replacement of a 53-year-old floating bridge and its east approach structure along State Route 520 in Medina, Washington, USA.

At a length of 2.4 km, the new, six-lane floating bridge is the world's longest floating bridge. It is bigger and more durable, as well as safer and slightly longer than its four-lane predecessor. The SR 520 Floating Bridge is designed to capture and filter roadway runoff, which previously drained off undiluted into Lake Washington.

HeidelbergCement’s subsidiary Cadman in Seattle supplied ready-mixed concrete for the new floating bridge, opened in April 2016. The bridge features shoulders for disabled vehicles and a separate path for bicyclists, walkers, and joggers.

The bridge is the 2017 Winner of the Washington State ACI Concrete in Excellence Award.

Project Data

  • Washington State Department of Transportation

    Owner

  • Kiewit/General/Manson JV

    Contractor

  • 2016

    Completion

United States

SR 520 Floating Bridge, USA. At a length of 2.4 km, the new, six-lane floating bridge is the world's longest floating bridge.

Washington State Department of Transportation

SR 520 Floating Bridge, USA. At a length of 2.4 km, the new, six-lane floating bridge is the world's longest floating bridge. Die Schwimmbrücke „SR 520 Floating Bridge“ führt in Medina, Washington, USA, über den Lake Washington und ist Teil der Staatsstraße (State Route) 520.

Washington State Department of Transportation

SR 520 Floating Bridge, USA. At a length of 2.4 km, the new, six-lane floating bridge is the world's longest floating bridge.

Washington State Department of Transportation

SR 520 Swimming bridge, USA. Die Schwimmbrücke „SR 520 Floating Bridge“ führt in Medina, Washington, USA, über den Lake Washington und ist Teil der Staatsstraße (State Route) 520.

Washington State Department of Transportation

SR 520 Floating Bridge, USA. At a length of 2.4 km, the new, six-lane floating bridge is the world's longest floating bridge.

Washington State Department of Transportation

SR 520 Floating Bridge, USA. At a length of 2.4 km, the new, six-lane floating bridge is the world's longest floating bridge. Die Schwimmbrücke „SR 520 Floating Bridge“ führt in Medina, Washington, USA, über den Lake Washington und ist Teil der Staatsstraße (State Route) 520.

Washington State Department of Transportation

SR 520 Floating Bridge, USA. At a length of 2.4 km, the new, six-lane floating bridge is the world's longest floating bridge.

Washington State Department of Transportation

SR 520 Swimming bridge, USA. Die Schwimmbrücke „SR 520 Floating Bridge“ führt in Medina, Washington, USA, über den Lake Washington und ist Teil der Staatsstraße (State Route) 520.

Washington State Department of Transportation