2017 Grand Conceptor Award Winner

SR 520 Floating Bridge, Seattle, WA


To view descriptions of the top 2016 winners, and the listing of all National Recognition Award winners by state, click here.


Winner of the 2017 Grand Conceptor Award was the new SR 520 Floating Bridge in Seattle, designed by HDR. This dynamic new 1.5-mile span is the world’s longest and largest floating bridge. The superstructure is supported by 21 of the heaviest, widest and deepest longitudinal pontoons ever built, each weighing nearly 11,000 tons.

Further stabilized by 54 supplemental pontoons and cables and anchors, the bridge can resist winds of up to 98 miles per hour and 6.3-foot wave heights or the equivalent of a 100-year storm. The new bridge provides six travel lanes for vehicular traffic, a dedicated transit and high-occupancy vehicle lane in each direction, as well as a 14-foot-wide shared-use pathway for cyclists and pedestrians; it will support the future addition of multimodal transportation options.



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