Public hot springs in Idaho come in many different shapes and sizes and range from easy access to multiple days of backpacking to access. The hot springs in this area are located on public lands; National Forest, BLM or Wilderness, and typically do not have any fees associated with access except for a few with day use fees.
Idaho has the most usable hot springs in the Nation, with about 130 soakable out of 340. However, Nevada has the most hot springs overall, but the majority of them are not soakable. Geothermal water is hot because it is heated from within the Earth's crust, forcing it up to the surface where pools are developed or form naturally near the outflow. Ninety percent of Idaho's 340 hot springs are the result of leftover energy heating water near fault lines whereas the remaining hot springs are traditionally heated by volcanic activity.
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