The Eagle River is a tributary of the Colorado River, approximately 60.5 mi long, in west central Colorado in the United States. It rises in southeastern Eagle County, at the continental divide, and flows northwest past Gilman, Minturn, Avon. Near Wolcott, it turns west, flowing past Eagle and Gypsum, and joins the Colorado at Dotsero, in western Eagle County. Its flow ranges from 200 cuft/s in late summer of dry years to 7000 cuft/s during spring runoff. Acid mine drainage from the abandoned Eagle Mine has entered the river.