Palouse Falls on the Palouse River, about 4 miles upstream of the confluence with the Snake River in southeast Washington. The falls are about 180 ft. high. The canyon at the falls exposes a large cross-section of the Columbia River Basalt Group. The falls and canyon downstream are important features of the channeled scablands, which were created by the great Missoula Floods that swept periodically across eastern Washington and across the Columbia River Plateau during the Pleistocene epoch.