The Duchesne River, located in Uintah Basin region of Utah in the western United States, is a tributary of the Green River. The watershed of the river covers the Northeastern corner of Utah. The Duchesne River is 80 miles (130 km) long, beginning in the Uinta Mountains of Utah.The Lake Fork of the Duchesne is impounded by the Moon Lake Dam, built in 1938 by the United States Bureau of Reclamation.