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State Route 520 (SR 520) is a state highway and freeway in the Seattle metropolitan area, part of the U.S. state of Washington. It runs 13 miles (21 km) from Seattle in the west to Redmond in the east. The freeway connects Seattle to the Eastside region of King County via the Evergreen Point Floating Bridge on Lake Washington.
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The U.S. state of Washington has over 7,000 miles (11,000 km) of state highways maintained by the Washington State Department of Transportation (WSDOT). [1] The highway system is defined through acts by the state legislature and is encoded in the Revised Code of Washington as State Routes (SR).
The system spans 8.5% of the state's public road mileage, but carries over half of the traffic. [2] [3] All other public roads in the state are either inside incorporated places (cities or towns) or are maintained by the county. [4] The state highway symbol is a white silhouette of George Washington's head (whom the state is named after).
The United States Numbered Highway System was approved and established on November 11, 1926 by the American Association of State Highway Officials (AASHO) and included eleven routes traveling through Washington. [1] [3] In 1961, the state introduced a set of route markers in Olympia that were colored based on destination and direction rather ...
New (left) and old (right) bridges in 2015 showing difference in decks: old road surface is directly on pontoons laid end-to-end, but new road surface is raised above pontoons laid perpendicular to road. The first stage of the SR 520 floating bridge replacement project was the construction of 77 concrete pontoons in 2011 and 2012 by Kiewit ...
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