![]() For instance, Primary State Highway 1 was the Pacific Highway (present Interstate 5), and Secondary State Highway 1B was a spur from Bellingham to the Canadian border (now State Route 539). A number of Primary State Highways were designated, while Secondary State Highways were suffixed spurs off those. The first major reworking of the system was passed in 1937, including a complete renumbering. The United States Numbered Highways were assigned in late 1926, overlapping some of the State Roads. In 1923, most state roads were assigned new numbers, though the primary and secondary split remained, and several roads remained named only. The seven primary roads were only assigned names, while the older state roads kept their numbers as secondary roads. However, it was not until 1913 that a connected system was laid out-earlier state roads had been disconnected segments of road needing improvements. A thirteenth was added in 1907, and State Roads 14 to 18 in 1909. The Washington Highway Department was established in 1905, and a set of twelve State Roads, numbered from 1 to 12, were assigned. Two other roads-a Cascade crossing at present State Route 410 and a branch of the first road to Wenatchee-were added in 1897. The first state road, running across the Cascade Range roughly where State Route 20 now crosses it, was designated by the legislature in 1893 (However, this road wasn't actually opened until 1972). The system of primary and secondary state highways were replaced by sign routes (now state routes) to consolidate and create a more organized and systematic method of numbering the highways within the state. These highways had named branch routes as well as secondary state highways with lettered suffixes. They were created as the first organized road numbering system in the state in stages between 19 and used until the 1964 state highway renumbering. state of Washington used in the early 20th century. Primary State Highways were major state highways in the U.S. State highways in 1970: primary in red and secondary in purple
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