YAMPA RIVER

river, in the western United States, rising in the White River National Forest of northwestern Colorado, in the Rocky Mountains. It flows north past Steamboat Springs, then turns west to flow through Yampa Canyon (about 1,600 feet deep) in Dinosaur National Monument and joins the Green River near the Utah border after a course of about 250 miles (400 km). Its chief tributary, the Little Snake, joins it from the north immediately east of the monument. The river's name probably derives from an Indian tribe.