These include the Bridger Wilderness on the western slope, designated in 1964, and the Fitzpatrick Wilderness and Popo Agie Wilderness on the eastern slope, designated in 1976 and 1984 respectively. Together these wilderness areas protect 728,020 acres (294,620 ha), making the Wind River Range one of the largest road-free areas in the continental United States. Part of the eastern slope of the Wind River Range is also under the protection of the Wind River Indian Reservation.