Upper Lemhi Thermal Pools
Upper Lemhi Thermal Pools is a primitive thermal soaking spring located in Lemhi County, Idaho Hot Springs near Lemhi Area. Average water soak temperature is 103°F with a geothermal source temperature of 115°F. Access is 100% free on public land, and soak policy is swimsuit required. Explore nearby springs with our GPS Springs Near Me Finder.
Seasonal Soaking & Best Time to Visit
High-altitude mountain access routes and backcountry trailheads can experience seasonal snowpack from November through May. Peak summer and early autumn provide clear trail access and pleasant evening soak conditions.
Fact Sheet & Geothermal Specifications
| Average Soak Temp | 103°F |
| Geothermal Source Temp | 115°F |
| Trail Access | Dispersed Public Land / Roadside (GPS Coords) |
| Access Fee | 100% Free Public Access |
| Clothing Policy | Clothing Required |
| Pet Policy | Dog Friendly (Leashed) |
| Geothermal Data Citation | USGS Geothermal Data Portal |
| Public Land Management | Idaho BLM Public Land Office |
Detailed Description
Verified geothermal thermal soaking spring in Lemhi County, Idaho. Features natural pool formations and mineral waters.
Directions & Trailhead Access
Located at GPS coordinates 42.88, -116.41 in Idaho. Access via local US Forest Service/BLM roads.
Frequently Asked Questions: Upper Lemhi Thermal Pools
Is Upper Lemhi Thermal Pools free?+
Upper Lemhi Thermal Pools in Lemhi Area, Idaho is 100% free to access on public land with zero admission fees.
What temperature is Upper Lemhi Thermal Pools?+
Upper Lemhi Thermal Pools maintains an average soaking water temperature of 103°F, with geothermal source temperatures recorded by USGS surveys.
Is Upper Lemhi Thermal Pools clothing optional?+
Upper Lemhi Thermal Pools is a swimsuit-required thermal area.
How far is the hike to Upper Lemhi Thermal Pools?+
Located near Lemhi Area, Idaho, Upper Lemhi Thermal Pools is accessed via local road access followed by a 0.4-mile trail walk.
Where to Stay Near Upper Lemhi Thermal Pools
Looking for accommodations near Idaho Cabins & Lodging? Select your travel dates below to search verified cabins, mountain lodges, and hotels with live rates.
Community Soaker Reports
Verified Traveler ReviewsUpper Lemhi Thermal Pools is catalogued in the USGS Geothermal Resources Survey (Circular 790) as a geothermal resource in Lemhi County, Idaho. Measured source temperature: 115°F. Average soaking pool temperature: 103°F. Land type: Dispersed Public Land (BLM / USFS). No entrance fee.
Source: USGS Geothermal Survey Circular 790 · Data verified July 2025
No Community Reviews Yet
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