Beaver Ponds trail - yellowstone

Fort Yellowstone was a U.S. Army fort, established in 1891 at Mammoth Hot Springs in Yellowstone National Park. Yellowstone was designated in 1872 but the Interior Department was unable to effectively manage the park. Administration was transferred to the War Department in August 1886 and General Philip Sheridan sent a company of cavalry to Mammoth Hot Springs to build a cavalry post.

Mammoth, Wyoming is a census-designated place in Park County, Wyoming, comprising Fort Yellowstone and Mammoth Hot Springs in Yellowstone National Park. As of the 2010 census, its population was 263.

The Mammoth Hot Springs Historic District in Yellowstone National Park comprises the administrative center for the park. It is composed of two major parts: Fort Yellowstone, the military administrative center between 1886-1918, and now a National Historic Landmark, and a concessions district which provides food, shopping, services, and lodging for park visitors and employees.

The Yellowstone Main Post Office in Yellowstone National Park was built in Mammoth Hot Springs as part of a facilities improvement program by the United States Post Office Department. The post office in Yellowstone was nominated to the National Register of Historic Places as part of a thematic study comprising twelve Wyoming post offices built to standardized USPO plans in the early twentieth century.