SR 213 is designated as a state highway corridor but state law provides that no county road shall be maintained or improved by the Highway (Transportation) Commission as a temporary route until such time as this route is actually constructed on the location adopted by the Commission. This corridor was added to the state highway system in 1959 as a branch of PSH 16 and given the designation of SR 20 (spur) in January 1964. The SR 213 designation was given to this route in 1973. The corridor starts at Jct US 97, crosses the Okanogan River to Malott, and ends at Jct SR 20 SW of Okanogan. A state highway might never actually be constructed in this corridor.
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