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The U.S. state of Washington has over 7,000 miles (11,000 km) of state highways maintained by the Washington State Department of Transportation (WSDOT). [1] The highway system is defined through acts by the state legislature and is encoded in the Revised Code of Washington as State Routes (SR).
The system spans 8.5% of the state's public road mileage, but carries over half of the traffic. [2] [3] All other public roads in the state are either inside incorporated places (cities or towns) or are maintained by the county. [4] The state highway symbol is a white silhouette of George Washington's head (whom the state is named after).
List of Auxiliary Interstate Highways in Washington Number Length (mi) [1] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes I-182: 15.19: 24.45 I-82 / US 12 near Richland: US 12 in Pasco: 1969 [41] current I-182 is a spur that serves the Tri-Cities area and was completed in 1986. [42] I-205: 10.57: 17.01
Interstate 5 (I-5) is an Interstate Highway on the West Coast of the United States that serves as the region's primary north–south route. It spans 277 miles (446 km) across the state of Washington, from the Oregon state border at Vancouver, through the Puget Sound region, to the Canadian border at Blaine.
Freya Street near Spokane: US 395 near Mead: proposed — Named the North Spokane Corridor freeway, bypasses Spokane US 730 Spur: 0.30: 0.48 US 730 near Wallula: US 12 near Wallula — — 1.000 mi = 1.609 km; 1.000 km = 0.621 mi
In 1905, the road became known as State Road 1 and was incorporated into the first state highway system. [26] By 1907, the road was named the White River – Natches Road and was shortened to end at Cedar Springs. The rest of the road was transferred to State Road 5, called the Cowlitz–Natches Road, which ran from Napavine to Naches. [27]
The Sunset Highway was numbered as State Road 2 in 1923 and later PSH 2 in 1937. [7] Its route was adopted by U.S. Route 10 in 1926 (replaced by Interstate 90 ) from Seattle to near Ellensburg, then U.S. Route 97 to Peshastin , then U.S. Route 2 to Spokane, then US 10/I-90 from Spokane to the Idaho state line.
State Route 3 (SR 3) is a 59.81-mile-long (96.25 km) state highway in the U.S. state of Washington, serving the Kitsap Peninsula in Mason and Kitsap counties. The highway begins at U.S. Route 101 (US 101) south of Shelton and travels northeast onto the Kitsap Peninsula through Belfair to Gorst, where it intersects SR 16 and begins its freeway.