Dirty Devil River, 80 mi/129 km long, SE central Utah, formed by confluence of Muddy Creek and Fremont R., 2 mi/3.2 km W of Hanksville. Flows SE and S through Wayne and Garfield cos. to Colorado R. 17 mi/27 km E of Mt. Hillers, through Wayne and Garfield cos. Sometimes called part of Fremont R. Lower 20 mi/32 km in Glen Canyon Natl. Recreation Area.
