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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.
The Mountain Loop Highway is a scenic byway in the U.S. state of Washington.It traverses the western section of the Cascade Range within Snohomish County.The name suggests it forms a full loop, but it only is a small portion of a loop, which is completed using State Routes 92, 9, and 530.
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.
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.
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.
A Washington State Department of Transportation snow plow is shown on Nov. 12, 2023, on state Highway 20. Washington State Department of Transportation.
Washington Pass (el. 5477 ft./1669 m.) and Rainy Pass (el. 4875 ft./1486 m.) are two mountain passes on State Route 20 (North Cascades Highway) in the North Cascades mountains of Washington state. Rainy Pass is about 4 miles to the west of Washington Pass. The passes are typically closed between November and April due to heavy snowfall.
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.