sentences:  Prior to the white man coming into the valley of the Touchet River, there was an established American Indian trail through the valley, the "Nez Perce Trail to Celilo Falls" or "Old Celilo Falls Trail", by which the Nez Perce (also part of the Sahaptin-speaking group) passed west to fish for salmon at Celilo Falls on the Columbia River.As with other Sahaptin-speaking peoples, the Nez Perce were migratory, returning to the same locations year after year; Celilo Falls lay at the western end of their annual range.On their return journey in 1806, the Lewis and Clark Expedition followed the "Old Celilo Falls Trail", up the Walla Walla and Touchet River Valleys; they camped on the Touchet about north of today's town of Touchet on April 30, 1806.