The tour follows Alpowa Creek along the canyon, with orchards along the canyon bottom. High hills, barren and eroded by wind and rain, rise to either side. Alpowa Creek rises in Umatilla National Forest in south Garfield County. It flows northeast for through Garfield and Asotin counties to the Snake River west of Clarkston. The stream is intermittent in its upper course, and sinks before reaching Snake River.