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.
Bighorn sheep both indicated on Clark's map and did retain their names, the latter being the namesake of the Battle of the Little Bighorn. Bighorn sheep The bighorn sheep ("Ovis canadensis") is a species of sheep native to North America named for its large horns. These horns can weigh up to , while the sheep themselves weigh up to . Recent genetic testing indicates three distinct subspecies of "Ovis canadensis", one of which is endangered: "O. c. sierrae". Sheep originally crossed to North America over the Bering land bridge from Siberia; the population in North America peaked in the millions, and the