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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.
The highway system is defined through acts by the state legislature and is encoded in the Revised Code of Washington as State Routes (SR). It was created in 1964 to replace an earlier numbering scheme and ratified by the state legislature in 1970. The system's 196 highways are almost entirely paved, with the exception of a gravel section on SR 165.
Mowich Lake Road is open seasonally from July to October, remaining closed to vehicular traffic during the winter and spring due to weather conditions. [3] [4] The southernmost section of the highway is an unpaved gravel road—the only one to be included in Washington's state highway system. [5]
[30] [31] State Road 23, connecting Spokane to Newport, was designated in 1915 before it was renamed to the Pend O'Reille Highway and renumbered to State Road 6 in 1923. [32] [33] [34] The Inland Empire Highway was numbered as State Road 3 in 1923 and retained the designation as PSH 3 in 1937, while State Road 6 became PSH 6. [34] [35]
State Route 4 (SR 4) is a 62.27-mile-long (100.21 km) state highway, serving the southwestern region of the U.S. state of Washington.The highway, also known as Ocean Beach Highway, travels east along the Columbia River from U.S. Route 101 (US 101) at Johnston's Landing through Pacific, Wahkiakum and Cowlitz counties to an interchange with Interstate 5 (I-5) in Kelso.
The highway is maintained by the Washington State Department of Transportation (WSDOT), who conduct an annual survey of traffic volume that is expressed in terms of annual average daily traffic (AADT), a measure of traffic volume for any average day of the year. Average daily traffic volumes on SR 108 in 2016 ranged from a minimum of 2,900 ...
The United States Numbered Highway System was approved and established on November 11, 1926 by the American Association of State Highway Officials (AASHO) and included eleven routes traveling through Washington. [1] [3] In 1961, the state introduced a set of route markers in Olympia that were colored based on destination and direction rather ...
State Route 115 (SR 115) is a 2.28-mile-long (3.67 km) state highway in the U.S. state of Washington serving the city of Ocean Shores in Grays Harbor County.The highway begins at Point Brown Avenue in Ocean Shores and travels east across the peninsula before turning north and ending at SR 109 south of Ocean City at Oyehut-Hogan's Corner.