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I-82 / US 395 at Oregon state line near Plymouth: 1957 [30] current Serves the Yakima Valley and Tri-Cities regions and was completed in 1986. [42] I-90: 297.51: 478.80 SR 519 in Seattle: I-90 at Idaho state line near Liberty Lake: 1957 [26] current Main east–west corridor in Washington and the longest Interstate, completed in 1993. [48]
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).
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).
State highways in 1970: primary in red and secondary in purple. Primary State Highways were major state highways in the U.S. state of Washington used in the early 20th century. They were created as the first organized road numbering system in the state in stages between 1905 and 1937 and used until the 1964 state highway renumbering. These ...
I-205 functions primarily as a bypass of I-5 in the Portland metropolitan area, and serves Vancouver, Washington, and the eastern suburban areas of Portland, Oregon. [4] It is listed as part of the National Highway System, which identifies routes that are important to the national economy, defense, and mobility, and Washington state recognizes it as a Highway of Statewide Significance.
SR 14 at its interchange with I-205, built in the 1970s. The first highway that traveled through the Columbia River Gorge was surveyed in 1905 at a cost of $15,000 (equivalent to $508,667 in 2025 [27]) by the state of Washington as a wagon road connecting Washougal in Clark County to Lyle in Klickitat County that was designated as secondary State Road 8. [28]
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 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]