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In addition to the state scenic highways system, several routes in Washington are designated as National Scenic Byways and All-American Roads. [23] Cascade Loop National Scenic Byway (2021) [24] Chinook Scenic Byway (1998), an All-American Road [25] Coulee Corridor Scenic Byway (2005) [26] International Selkirk Loop (2005), an All-American Road ...
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).
Longest special U.S. route in Washington, serves Entiat and Chelan US 97 Alt. — — US 97/SSH 3A in Toppenish: US 97 in Union Gap: 1955 [11] 1973 [12] Replaced by US 97 US 97 Spur: 0.26: 0.42 US 97 near Orondo: US 2 near Orondo — — Shortest special U.S. route in Washington US 97 Bus. — — US 97 near Okanogan: US 97/SR 20 near Omak: c. 1967
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.
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
State Road 9 became Primary State Highway 9 (PSH 9), while State Road 12 became PSH 12; both remained co-signed with US 101. [37] The Washington State Highway Commission submitted an application to AASHO in 1955 to extend US 101 northeast from Discovery Bay to Whidbey Island and Mount Vernon , where it would terminate at US 99 . [ 38 ]
The first segment of what is now US 97 in Washington to be included in the state highway system was a road extending from Wenatchee to Twisp, designated in 1897. Since, four early highways formed the modern route of the roadway: State Road 8, State Road 3, State Road 2 and State Road 10, all signed in 1923.
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.