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State Route 20 (SR 20), also known as the North Cascades Highway, is a state highway that traverses the U.S. state of Washington.It is the state's longest highway, traveling 436 miles (702 km) across the northern areas of Washington, from U.S. Route 101 (US 101) at Discovery Bay on the Olympic Peninsula to US 2 near the Idaho state border in Newport.
Construction of the road started in 1936 and finished in 1941. The road was closed in 1942 due to the World War II. [2] The highway closes mostly in the winter due to floods and reopens in the spring of the following year, but a flood in 2003 closed the highway. With other windstorms following in 2006 and 2007, the highway had to be closed ...
All state highways are designated by the Washington State Legislature and codified in the Revised Code of Washington (RCW), namely Chapter 47.17 RCW. These routes are defined generally by termini and points along the route; WSDOT may otherwise choose the details, and may bypass the designated points as long as the road serves the general vicinity.
Clearing efforts on Highway 20, the northernmost North Cascades pass, will began Monday, March 27, the Washington State Department of Transportation said on its social media.
Several miles of the road — from west of Newhalem to east of Diablo — loops through Whatcom County. Construction of the modern highway began in 1959 and it opened Sept. 2, 1972.
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 ...
I-205 is a loop that bypasses Portland, Oregon, and Vancouver, Washington; its Washington section was completed in 1982 and the entire highway opened in 1983. [44] I-405: 30.30: 48.76 I-5 / SR 518 in Tukwila: I-5 / SR 525 in Lynnwood: 1958 [29] current I-405 is a loop that bypasses Seattle to serve the Eastside and was completed in 1969. [37] I-705
The International Selkirk Loop begins on U.S. Route 2 at the Washington-Idaho state line, in the city of Newport.The highway proceeds west for a short distance, passing several buildings that make up the twin, before U.S. Route 2 splits off, and the Loop designation transfers to Washington State Route 20.