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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).
State Route 18 (SR 18) is a 28.41-mile-long (45.72 km) state highway in the U.S. state of Washington, serving southeastern King County.The highway travels northeast, primarily as a controlled-access freeway, from an intersection with SR 99 and an interchange with Interstate 5 (I-5) in Federal Way through the cities of Auburn, Kent, Covington, and Maple Valley.
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 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.
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]
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 road now designated SR 900 was originally added to the state highway system in 1909, as an extension of the Snoqualmie Pass Road (State Road 7) which was completed for through traffic across the pass in 1915. At the time the highway was the main thoroughfare between Seattle and Spokane, with a route then around the south end of Lake Washington.
State Route 530 (SR 530) is a state highway in western Washington, United States.It serves Snohomish and Skagit counties, traveling 50.52 miles (81.30 km) from an interchange with Interstate 5 (I-5) southwest of Arlington past SR 9 in Arlington and Darrington to end at SR 20 in Rockport.
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