Big Lemhi Thermal Pools
Big Lemhi Thermal Pools is a developed thermal soaking spring located in Lemhi County, Idaho Hot Springs near Lemhi Area. Average water soak temperature is 108°F with a geothermal source temperature of 120°F. Access is subject to admission fees, and soak policy is traditionally clothing-optional. 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 | 108°F |
| Geothermal Source Temp | 120°F |
| Trail Access | Dispersed Public Land / Roadside (GPS Coords) |
| Access Fee | Paid / Resort Fees |
| Clothing Policy | Clothing Optional |
| Pet Policy | No Pets Allowed |
| 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 44.305, -115.135 in Idaho. Access via local US Forest Service/BLM roads.
Frequently Asked Questions: Big Lemhi Thermal Pools
Is Big Lemhi Thermal Pools free?+
Big Lemhi Thermal Pools in Lemhi Area, Idaho is a developed facility requiring day-use admission or resort fees.
What temperature is Big Lemhi Thermal Pools?+
Big Lemhi Thermal Pools maintains an average soaking water temperature of 108°F, with geothermal source temperatures recorded by USGS surveys.
Is Big Lemhi Thermal Pools clothing optional?+
Big Lemhi Thermal Pools is traditionally clothing-optional for thermal soaking.
How far is the hike to Big Lemhi Thermal Pools?+
Located near Lemhi Area, Idaho, Big Lemhi Thermal Pools is accessed via local road access followed by a 0.1-mile trail walk.
Where to Stay Near Big 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 ReviewsBig Lemhi Thermal Pools is catalogued in the USGS Geothermal Resources Survey (Circular 790) as a geothermal resource in Lemhi County, Idaho. Measured source temperature: 120°F. Average soaking pool temperature: 108°F. Land type: Managed Thermal Facility. Admission fees apply.
Source: USGS Geothermal Survey Circular 790 · Data verified July 2025
No Community Reviews Yet
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