SR 260 begins at Jct SR 17 seven miles north of Mesa and seven miles west of Connell. From SR 17, SR 260 heads east via Connell to Kahlotus, then NE via McAdam to Jct SR 26/SR 261 at the north end of Washtucna, where SR 260 ends. SR 260 is 37.98 miles long.
Before 1964, SR 260 had been part of SSH 11B.
From McAdam to Washtucna, SR 261 shares the roadway with SR 260. This section is only posted as SR 260, however. At one time, WSDOT had plans to build a new alignment of SR 261 from the Palouse Falls area more or less directly to Washtucna. There are no active plans build this new alignment. Thus, if one actually drives SR 261 from end to end, there is a gap in signage between McAdam and Washtucna.
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