Mormon Bend Hot Spring is a natural thermal spring in Idaho. Its water was recorded at about 100°F (38°C) at the surface — a ideal water temperature. That figure is a historical maximum surface reading from the USGS thermal-springs inventory, not the temperature of a soaking pool, and it doesn't tell you whether the spring is developed, accessible, or safe to enter.
In the classic hot-tub range, up to about 104°F — the comfortable soaking window recommended for hot water.
Mormon Bend Hot Spring's recorded temperature falls in a comfortable range, but this is a single historical surface reading — actual conditions vary by season, rainfall, and exactly where you measure. Confirm the current temperature yourself before entering.
This listing comes from the USGS/NOAA thermal-springs inventory (a reference dataset compiled from records dating to the 1960s–1980s). It does not include ownership, developed-vs-primitive status, or access rights. Many U.S. thermal springs sit on private, tribal, or protected land, or are undeveloped and unsafe — always verify legal access and current conditions with the land manager before visiting, and follow Leave No Trace.
