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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 joint operation with the Empire Builder ended on June 11, 1973, when Amtrak extended the North Coast Hiawatha to Seattle using the GN's route via Stevens Pass and the Cascade Tunnel, which included stops at the northern Washington cities of Wenatchee and Everett. The train remained on a tri-weekly schedule west of Minneapolis.
Most state routes are numbered in a grid, with even-numbered routes running east–west and odd-numbered routes running north–south. [ b ] Even two-digit routes increase from south to north in three "strips", with SR 4 , SR 6 , and SR 8 in the western part of the state, SR 14 , SR 16 , SR 18 , and SR 20 along the Interstate 5 corridor, and SR ...
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 ...
The first auxiliary route to be fully completed was I-405, which was opened to traffic between Woodinville and Lynnwood in November 1969. [37] The state government made improvements to the expanding Interstate system in the 1960s and 1970s, building rest areas and scenic overlooks on the primary routes and introducing mileage-based exit numbers ...
The Washington state highway system was changed to its current "sign route system" beginning in January 1963 with a state highway renumbering. [63] Under the new system, Interstate highways, U.S. routes, and state routes replaced the primary and secondary highways and were codified under the Revised Code of Washington in 1970. [3]
A second alternate route was established in the 1940s [year needed] after the opening of the Lake Washington Floating Bridge between Seattle and Mercer Island. [96] US 10 previously traveled between Seattle and Issaquah via the south side of the lake, passing through Renton and crossing the Issaquah Alps . [ 91 ]
Interstate 82 (I-82) is an Interstate Highway in the Pacific Northwest region of the United States that travels through parts of Washington and Oregon.It runs 144 miles (232 km) from its northwestern terminus at I-90 in Ellensburg, Washington, to its southeastern terminus at I-84 in Hermiston, Oregon.