Hot Creek Warm Spring
Hot Creek Warm Spring emerges at 97°F within the Boise National Forest at 5,575 feet in Valley County, about a half-mile walk from Johnson Creek Road near McCall. The water maintains a 56-degree differential above ambient air in a high mountain basin that averages just 41°F annually and receives over 14 feet of snow each winter.
The spring feeds into Hot Creek through dense subalpine forest where lodgepole pine predominates and meadows open along the creek bottom. At this elevation, the growing season is short and wildflowers peak in July. The surrounding terrain rolls toward the Frank Church-River of No Return Wilderness boundary, and the sense of isolation is genuine despite the relative proximity to Johnson Creek Road. Morning fog often settles in the drainage, mixing with thermal steam from the spring.
Johnson Creek Guard Station, a reservable 1922 cabin, sits 3.8 miles away and provides the nearest overnight option. The spring requires roughly a half-mile walk from the road. At 97°F, the water temperature is comfortable for extended soaking without needing to mix in cold water. Access via Johnson Creek Road is seasonal, typically open from early June through late September depending on snowpack.
The spring's alkaline chemistry, with a pH of 8.7 and TDS of 252 mg/L, reflects deep circulation through the granitic Idaho Batholith before surfacing along fracture zones in this high drainage. Sodium dominates at 63 mg/L while calcium remains low at 3.2 mg/L, a signature pattern of geothermal water that has traveled far underground. The Johnson Creek drainage has served as an access corridor into the central Idaho wilderness since Forest Service trails were first cut in the early 1900s.
The water at Hot Creek Warm Spring is alkaline (pH 8.7) with 252 mg/L total dissolved solids.
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Overview Johnson Creek Guard Station was built in 1922 and offers a charming mountain respite with modern conveniences. The cabin offers nearly everything needed for a pleasant and comfortable stay. Peak season for the cabin is typically early June through late September. It can be accessed by most vehicles via dirt and gravel roads, but trailers are not recommended.Recreation The cabin is near several trailheads into the Frank Church - River of No Return Wilderness. These non-motorized tr...
Hot Creek Warm Spring sits at 5,575 feet above sea level, way above the mile-high mark. You may not feel the altitude strongly, but hot water still dehydrates you faster at elevation. UV is about 22% stronger than at sea level, so bring sunscreen and drink more water than you normally would.
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Hot Creek Warm Spring is road-accessible, so you can bring more gear. Cold air temperatures make a changing robe or warm layers essential.
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