PSH 4 (WA)
Primary State Highways were major state highways in the U.S. state of Washington (state), 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 (Washington), 1964 state highway renumbering. These highways had named branch routes as well as secondary state highways with lettered suffixes. The system of primary and secondary state highways were replaced by State highways in Washington, sign routes (now state routes) to consolidate and create a more organized and systematic method of numbering the highways within the state. History The first state road, running across the Cascade Range roughly where Washington State Route 20, State Route 20 now crosses it, was designated by the legislature in 1893 (However, this road wasn't actually opened until 1972). Two other roads—a Cascade crossing at present Washington State Route 410, State Rout ...
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