Bighorn River river passes through Yellowtail Dam and Afterbay Dam. The river turns to the northeast and enters the Great Plains. At Hardin the river is joined by the Little Bighorn River. Approximately downriver from the Little Bighorn, in Big Horn County, the Bighorn empties into the Yellowstone. The Bighorn River has also been known as the Great Horn River, Le Corne and Iisaxpúatahcheeaashisee in the Apsáalooke language which translates to English as "Large Bighorn Sheep River". Bighorn River The Bighorn River is a tributary of the Yellowstone, approximately long, in the states of Wyoming and Montana in the western United States.
Little Bighorn River top the Bighorn Mountains. In Wyoming, at the end of the two mile stretch of road from the mouth of the canyon Bighorn National Forest Service lands extend up to and over the top of the Bighorn Mountains. In the Little Bighorn watershed there are cougars, black bears, deer, elk, wild turkeys and other birds and small mammals, all of which are common to the Bighorn Mountains. An occasional moose has been sighted. The floor and sides of the Little Bighorn canyon is notorious for rattlesnakes. Herpetologists from the Bighorn National Forest state that the east facing canyons of the