Washington State Route 520 is a freeway in the state of Washington, U.S.A. It extends 14 miles from Seattle in the west to Redmond in the east.
Originating at Interstate 5 in Seattle at the north end of Capitol Hill, it crosses Portage Bay on a viaduct, runs through the Montlake neighborhood, and from there runs on a causeway through the marshlands of Washington Park. It crosses Lake Washington on the Evergreen Point Floating Bridge (1963)--at 7,578 feet, the longest floating bridge in the world--to Medina. From there, it separates Hunts Point and Yarrow Point to the north from Clyde Hill to the south. Intersecting with Interstate 405 in Bellevue, it then runs through Redmond, bisects the Microsoft campus, crosses the Sammamish River and Bear Creek , and ends at Avondale Road N.E.
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