135 °F (57.2 °C). The state park offers free bathing at the State Bath House, where temperatures are moderated to a therapeutic 104 °F (40.0 °C).[3] The petroglyph site at Legend Rock, some 25 miles (40 km) away, is also part of the park.[4] The park is managed by the Wyoming Division of State Parks and Historic Sites.
History

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 (260 km2) of the Shoshone reservation. A 1-square-mile section (2.6 km2) of that land was released to the state in 1897 which became Wyoming’s first state park, known as Big Horn Hot Springs State Reserve.[5][6]
A small herd of bison was established in 1916.[7]
Features
Designated as the State Bison Herd, the number of bison is maintained at 15 due to the carrying capacity of the pasture.[8] The park features a suspension foot bridge across the Big Horn River, picnic shelters, boat docks, flower gardens, and terraces made of naturally forming travertine (calcium carbonate) caused by a flowing mineral hot spring.[3] The park area encompasses commercial hotels and several state-run and privately operated entities including the Gottsche Rehabilitation Center, Hot Springs County Memorial Hospital, the historic Callaghan Apartments/Plaza Hotel, the Star Plunge waterpark, the Tepee Pools waterpark, and the Wyoming Pioneer Home, a state-run, assisted-living facility.
Gallery
- Travertine formation
at Hot Springs State Park - Winter view of the suspension footbridge
over the Big Horn River - Big Horn Hot Springs, c. 1914
- Two tourists at Big Horn Hot Springs, Thermopolis Wyoming, early 20th century