 The petroglyph site at Legend Rock, some 25 miles away, is also part of the park.The park is managed by the Wyoming Division of State Parks and Historic Sites.The land on which the state park sits was a cession agreement, and the ceded portion was purchased from the Eastern Shoshone by the federal government in 1896, when Indian Inspector James McLaughlin negotiated a purchase price of $60,000 for a 100-square-mile portion of the Shoshone reservation.