A celebration for the completion of the new SR 520 Bridge, the world’s longest floating bridge, is happening this weekend in Seattle, though it won’t be open to traffic for a few weeks. The existing ...

Ever driven across the state Route 520 bridge and wondered how something that massive and made of that much concrete can float? At 1.5 miles long, the existing 520 Bridge between Seattle and Medina is ...

Trains pass over all types of bridges to get where they're going, including typical steel girder and truss bridges seen all across America, trestle bridges, and even viaducts (think the Hogwarts ...

Washington State Archives, used with permission August 28, 1963: Opening day on the 520 floating bridge. Another 50th anniversary—of much less import than this one—happened yesterday. The “longest ...

Yesterday afternoon at a school in Medina, the Washington State Department of Transportation and contractor Kiewit/General/Manson, A Joint Venture (KGM) unveiled the latest construction plans and ...

Many of the people traveling across one of Lake Washington’s floating bridges likely take the innovative spans for granted, but when the lake’s very first floating bridge opened to traffic on July 2, ...