Holdover Hot Spring, known locally as Mile 15 Hot Spring, flows at 117°F along the South Fork Salmon River Road within the Payette National Forest. Positioned at 4,160 feet in Valley County near McCall, it sits roadside in one of Idaho's most snow-heavy drainages, where annual snowfall averages over 173 inches.
The spring emerges near the South Fork Salmon River in a steep, timbered canyon where the road follows the river's course through wilderness-adjacent terrain. Old-growth ponderosa pine and Douglas fir line the slopes, and the river runs clear and cold below. Annual precipitation tops 35 inches, and the canyon holds snow well into spring. The air carries the mineral scent of thermal water mixing with cold river spray, and steam marks the source in winter.
History of Holdover Hot Spring
The South Fork Salmon drainage cuts through the edge of the Idaho Batholith, where deep fractures in granitic rock channel geothermally heated water to the surface. The highly alkaline pH of 9.6 and low calcium of 1.4 mg/L indicate classic deep-circulation water that has shed its mineral load during a long underground journey. USGS measurements recorded 47°C with a modest flow of 0.06 cubic feet per second.
Johnson Creek Guard Station, a historic 1922 Forest Service cabin, is the nearest reservable accommodation at 19.4 miles. The spring sits less than 100 feet from South Fork Salmon River Road, making access easy when the road is open. The road typically closes in winter due to heavy snow. Water at 117°F needs cooling before soaking; look for pools where river water mixes in.
Is Holdover Hot Spring worth visiting?
Best for
- Hot spring soaking
- Easy day trips
- Overnight camping trips
Holdover Hot Spring offers an accessible hot spring experience — great for a day trip.
Annual Precip: 35.0 in
Annual Snow: 173.4 in
December
Air 26°F · Water 117°F · +91° contrast
January
Air 28°F · Water 117°F · +89° contrast
February
Air 30°F · Water 117°F · +87° contrast
December offers 45°F more contrast than July
Recent Temperature
116.6°F
(47.0°C)
Measured Jun 04, 1980
Discharge
0.06 ft³/s
Measured Oct 18, 1977
The water at Holdover Hot Spring is alkaline (pH 9.6).
pH influences mineral absorption through skin
May support bone density and joint health
Supports circulation and skin hydration
Traditionally used for skin conditions and inflammation
Natural antiseptic with skin health benefits
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...
Reserve on Recreation.gov →
Swimsuit & towel
Water bottle
Stay hydrated, especially in hot water
Camping gear
Nearby camping at Johnson Creek Guard Station
Trash bag
Pack out what you pack in
Water shoes
Hot ground near source
USGS Quad: WHITE ROCK PEAK 7.5 · PP 492: 25.0 · NOAA: 3.0 · AMS Map: CHALLIS
What is the water temperature at Holdover Hot Spring?
Holdover Hot Spring has a water temperature of 117°F (47°C). This is considered a hot spring, well above body temperature.
Where is Holdover Hot Spring located?
Holdover Hot Spring is located in Valley County, Idaho at 4,160 feet elevation, near McCall. Coordinates: 44.8470°N, 115.6960°W.
How do I get to Holdover Hot Spring?
Holdover Hot Spring has Roadside road access, with the nearest road being South Fork Salmon River Road (323 ft from the road).
Is Holdover Hot Spring free to visit?
Holdover Hot Spring has Open access. It is managed by US Forest Service.
Can I camp near Holdover Hot Spring?
Yes, Johnson Creek Guard Station is located nearby (12.1 miles away).
What minerals are in the water at Holdover Hot Spring?
Water chemistry analysis shows the presence of pH, Calcium, Sodium, Sulfate, Chloride. The pH is 9.6 (alkaline).
Is it safe to soak at Holdover Hot Spring?
At 117°F, Holdover Hot Spring is hot enough to require caution. Enter slowly, limit soaking sessions to 15–20 minutes, and stay hydrated. Always tell someone your plans before visiting remote hot springs.
Is Holdover Hot Spring crowded?
Holdover Hot Spring is accessible from a paved road, making it easy to reach. Weekends and holidays may be busier — consider visiting on a weekday for a quieter experience.
What should I bring to Holdover Hot Spring?
Essentials for Holdover Hot Spring: swimsuit, towel, water bottle, camping gear, a trash bag to pack out what you pack in. The water is over 110°F — test the temperature before entering and watch for scalding near the source.