SR 215 starts at Jct SR 20 in the south end of Okanogan and heads north to Jct US 97/SR 20 in the north end of Omak. All of SR 215 follows former US 97 in Okanogan and Omak. All of SR 215 is also signed as Business US 97.
In the mid 1960s, a 2 lane limited access expressway was built east of downtown Omak and Okanogan. When the US 97 expressway was opened, former US 97 was signed as a branch of SR 20. The unposted legislative number assigned to this route was SSH 16A. When SR 20 was extended east from the Omak- Okanogan area to Newport in 1973, SR 20 was also moved to the expressway in order to bypass Okanogan and Omak. At this time, the SR 215 designation was assigned to the route thru town. Today SR 215 is 6.24 miles long.
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