Bighorn Canyon National Recreation Area is a national recreation area established by an act of Congress on October 15, 1966, following the construction of the Yellowtail Dam by the Bureau of Reclamation. It is one of over 420 sites managed by the U.S. National Park Service. The recreation area spans 120,296.22 acres, straddling the border between Wyoming and Montana. It is divided into two distinct areas, the North District accessed via Fort Smith, Montana and the South District accessed through Lovell, Wyoming. There is no thru road inside the recreation area connecting the two districts. The Yellowtail Dam is located in the North District. It is named after the famous Crow leader Robert Yellowtail, harnesses the waters of the Bighorn River by turning that variable watercourse into Bighorn Lake. The lake extends 71 miles (114 km) through Wyoming and Montana, 55 miles (89 km) of which lie within the national recreation area. The lake provides recreational boating, fishing, water skiing, kayaking, and birding opportunities to visitors. About one third of the park unit is located on the Crow Indian Reservation. Nearly one-quarter of the Pryor Mountains Wild Horse Range lies within the Bighorn Canyon National Recreation Area.

A national recreation area (NRA) is a protected area in the United States established by an Act of Congress to preserve enhanced recreational opportunities in places with significant natural and scenic resources. There are 40 NRAs, which emphasize a variety of activities for visitors, including hiking, camping, boating, fishing, swimming, biking, horseback riding, and wildlife viewing, in areas that include multiple-use management for both conservation and limited utilization of natural resources. They have diverse features and contexts, being established around reservoirs, in urban areas, and within forests. Due to their size, diversity of activities, and proximity to population centers, NRAs are among the most visited units of the National Park System, with six among the thirty most visited sites.