History
SR 21 originated as the Marble Mount Road that extended from the north end of the Keller Ferry to Republic and was established in 1899. The Marble Mount Road was later numbered State Road 4 in 1905 and renamed to the Sans Poil-Loomis Road in 1907. An extension of State Road 4 from Republic to the Canadian border existed from 1915 until 1923. When the Primary and secondary highway system was established in 1937, Primary State Highway 4 (PSH 4) replaced State Road 4 and was extended south from the Keller Ferry to Wilbur. The Canadian border branch of State Road 4 that was deleted in 1923 was re-added as Secondary State Highway 4A (SSH 4A) and a highway extending south from Wilbur to Lind became SSH 2B. All three roadways were later combined as SR 21 in a highway renumbering in 1964. In 1983, SR 21 was extended south to SR 260 in Kahlotus. Since 1983, the road has not been realigned with the exception of the U.S. Route 395 (US 395) interchange in Lind. The speed limit between Curlew Lake State Park and the community of the same name was temporarily lowered on 9 March 2009 to 35 miles per hour (56 km/h) due to cracks in the pavement. The speed limit was restored to 55 miles per hour (89 km/h) on 9 March.
Read more about this topic: Washington State Route 21
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