Evergreen Point Floating Bridge, Floating bridge across Lake Washington in Seattle, United States
The Evergreen Point Floating Bridge is a pontoon bridge in King County that crosses Lake Washington and links Seattle with communities to the east. The structure rests on large concrete pontoons that float on the water surface and are held in place by anchors.
The original bridge opened on August 28, 1963, with 33 pontoons and a drawspan at its center, built for $24.7 million. Planning for a replacement began in 1997, and construction of 77 concrete pontoons started in 2011; the new span opened in April 2016 on a $4.65 billion budget.
Locals call it the 520 Bridge after State Route 520, while its official name honours Governor Albert D. Rosellini. Its 77 concrete pontoons were built in Aberdeen and Tacoma, then towed through the Lake Washington Ship Canal to the lake. A multi-use trail on the north side carries cyclists and pedestrians.
The bridge has dedicated lanes for buses and carpools on the left side. An electronic toll system captures vehicles automatically, with charges varying depending on time of day.
The bridge is the longest and widest floating bridge in the world, supported by 77 concrete pontoons. The central section reaches a width of about 35 meters (116 feet) and accommodates multiple lanes along with pedestrian and bicycle paths.
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