SR 23 begins at Jct US 195 in Steptoe and heads northwesterly via St. John and Ewan, crossing I-90 at Sprague, and ending at Jct SR 28 at Harrington. SR 23 is 66.00 miles long.
Before 1964, SR 23 from Steptoe to Sprague had been part of PSH 18 and from Sprague to Harrington, SSH 11F .
Interstate Routes
US Routes
State Routes
Primary State Hwys
Secondary State Hwys
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