Bighorn River

The Bighorn River is a tributary of the Yellowstone, approximately 461 miles (742 km) long, in the western United States in the states of Wyoming and Montana.The upper reaches of the Bighorn, south of the Owl Creek Mountains in Wyoming, are known as the Wind River. The two rivers are sometimes referred to as the Wind/Bighorn. The Wind River officially becomes the Bighorn River at the Wedding of the Waters, on the north side of the Wind River Canyon near the town of Thermopolis.