When first posted in 1964, SR 17 started at Jct US 395 near Eltopia and headed north to Jct US 97 east of the mouth of the Okanogan River a few miles east of Brewster. US 395 headed ENE from Eltopia, then north to Connell. In 1979, US 395 was rerouted north from Eltopia to Mesa, eliminating approximately 8 miles of SR 17. 395 then headed ENE to Connell on a new roadway. Today, SR 17 is 136.67 miles long.
Before 1964, the Eltopia to Soap Lake prtion of SR 17 was SSH 11G, from Soap Lake to US 2 near Coulee City a branch of PSH 7, and from US 2 to US 97 the Brewster to Coulee City branch of PSH 10.
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