Shoshone and Arapaho tribes sold these springs to the state of Wyoming in 1896 with the stipulation that they remain free for public use. Today, 500m3/h 57°C water flow daily from Monument Hill, transported via a pipe in the centre of two 6m travertine terraces created over the course of a century by the continual deposit of 27 different minerals. The Wyoming State Bathhouse (no entry fee) sits between two commercial facilities at the foot of the springs.