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With Host Professor Joseph Schofer of Northwestern University.

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Four longitudinal pontoons and two stability pontoons under construction for the SR 520 Bridge
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State Route 520 Floating Bridge in Seattle

Posted April 25, 2016, Length: 12:20

There are many floating bridges in use around the world, but the Seattle region has three large bridges of this design. The State Route 520 Bridge over Lake Washington, the Gov. Albert D. Rosellini Bridge, is the longest in the world. Heavily used and assaulted by wind and waves for more than five decades, this bridge has been replaced by a new facility. Here to tell us about this large and complex project is Julie Meredith, Washington State DOT Administrator of the SR 520 replacement program.

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Descriptions of photos at top of page, from left to right:
Bayonne Bridge, from Bayonne, NJ to Staten Island, NY; the Tom Moreland Interchange in Atlanta, GA; Dworshak Dam, in Clearwater County, ID; a transmission substation in Orem, UT.
All photos courtesy of Wikipedia.