State Route 20, also known alternately as the North-Cross Highway, SR 20 or the North Cascades Highway, is a State Highway (Route) in the State of Washington. It travels from an intersection with U.S. Route 101

U.S. Route 101 in Washington

In the U.S. state of Washington, U.S. Route 101 is the westernmost state highway, serving the Olympic Peninsula. It runs from the Astoria-Megler Bridge north to the cities of Raymond, Aberdeen, Hoquiam, and Forks before turning east at the small community of Beaver to the most northern point of the...

 at Discovery Bay near Port Townsend

Port Townsend, Washington

Port Townsend is a city in Jefferson County, Washington, United States, approximately north-northwest of Seattle . The population was 9,113 at the 2010 census an increase of 9.3% over the 2000 census. It is the county seat and only incorporated city of Jefferson County...

 to Newport

Newport, Washington

Newport is a city in, and the county seat of, Pend Oreille County, Washington. The population was 2,126 at the 2010 census.-History:Newport was given its name in 1890 because it was selected as a landing site for the first steamboat on the Pend Oreille River. Newport was officially incorporated on...

 at a junction with U.S. Route 2

U.S. Route 2 in Washington

U.S. Route 2 is a part of the United States Numbered Highway System that has a western segment that runs from Everett, Washington, to the Upper Peninsula of the US state of Michigan. In Washington, it is a state highway that begins at in Downtown Everett. The of US 2 that lie within...

 about 400 feet (122 m) from the Idaho

Idaho

Idaho is a state in the Rocky Mountain area of the United States. The state's largest city and capital is Boise. Residents are called "Idahoans". Idaho was admitted to the Union on July 3, 1890, as the 43rd state....

 state line. Although U.S. Route 12

U.S. Route 12 in Washington

U.S. Route 12 is a major east-west U.S. Highway, running from Aberdeen, Washington, to Detroit, Michigan. It spans across the state of Washington, and is the only numbered highway to span the entire state from west to east, starting near the Pacific Ocean, and crossing the Idaho state line near...

 has a larger east–west extent, SR 20 is the longest highway in Washington at 436.13 miles (701.88 km), only 5.3 miles (8.6 km) longer than US 12.