East Fork Sevier River (suh-VIR), 90 mi/145 km long, S Utah; rises in NW Kane co., Dixie Natl. Forest, in Paunsaugunt Plateau SW of Bryce Canyon Natl. Park; flows N, past Antimony, receives Otter Creek from NE, then W, through Sevier Plateau, to Sevier R. near Junction. Dam on lower course forms Otter Creek Reservoir.