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It arises in several forks along the north side of the Wind River Range in west central Wyoming. It flows southeastward, across the Shoshone Basin and the Wind River Indian Reservation and joins the Little Wind River near Riverton. It flows northward, through a gap in the Owl Creek Mountains, where the name of the river becomes the Bighorn River. In the Owl Creek Mountains, it is dammed to form the Boysen Reservoir , which is considered the source of the Bighorn.