Union Flat Creek is a long tributary of the Palouse River. Beginning at an elevation of near Genesee in northern Nez Perce County, Idaho, it flows west into Whitman County, Washington, passing through the towns of Uniontown and Colton. It then flows to its mouth west of La Crosse, at an elevation of .
See also List of rivers of Washington (state) List of rivers of Idaho List of longest streams of Idaho
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