Washington State Route 520
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Map of King County in western Washington with SR 520 highlighted in red
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| Route information | ||||
| Auxiliary route of I‑5 | ||||
| Defined by RCW 47.17.720 | ||||
| Maintained by WSDOT | ||||
| Length: | 12.82 mi (20.63 km) | |||
| Major junctions | ||||
| West end: |
 I‑5 in Seattle
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 I‑405 in Bellevue
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| East end: |
 SR 202 in Redmond
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| Location | ||||
| Counties: | King | |||
| Highway system | ||||
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State Route 520 is a state highway and freeway in the U.S. state of Washington. It extends 12.82 miles (20.63 km) from Seattle in the west to Redmond in the east.
SR-520 originates at Interstate 5 in Seattle at the north end of Capitol Hill just south of Roanoke Park.
It bridges Portage Bay on a viaduct, crosses through the Montlake neighborhood, and continues east on a causeway through the marshlands of the Washington Park Arboretum and across Foster Island. From there it crosses Lake Washington on the tolled Evergreen Point Floating Bridge (2016) to Medina. At 7,710 feet (2,350 m), it is the longest floating bridge in the world.
From Medina, it traces the border between Hunts Point and Yarrow Point to the north, and Clyde Hill to the south. Intersecting with Interstate 405 in Bellevue, it then runs into Redmond. It bisects the Microsoft campus, passes Nintendo of America headquarters and crosses the Sammamish River and Bear Creek, before ending at a junction with State Route 202. A set of ramps connecting SR-520 to Avondale Road NE were completed in 1996.
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