Middle Fork Indian Creek Hot Spring

Custer County, Idaho · Near Challis
44.8130°N, 115.1230°W · 5,438 ft
162°F 32°F air · Good soaking weather 5,438 ft Open Hike US Forest Service Camping nearby (19.1 mi)
Very Hot Source, Use Extreme Caution

At 162°F, the source water at Middle Fork Indian Creek Hot Spring is hot enough to cause burns. Some hot springs this hot have cooler side pools or downstream areas suitable for soaking. Always test the water temperature before entering.

Aerial view of the ground around Middle Fork Indian Creek Hot Spring LiDAR bare-earth view of the same ground around Middle Fork Indian Creek Hot Spring
Aerial LiDAR bare earth

Drag the handle to compare the two views. The orange dot marks the spring, in a frame about three quarters of a mile wide.

Deep in the Boise National Forest, Custer County, Idaho, Middle Fork Indian Creek Hot Spring is a remote, scalding source. The closest town the record gives is Challis, close to fifty miles away. Open access. The temperature on file is well past the point of burning skin, so this is a thermal source to look at, with any soaking dependent on cooled outflow that the record does not cover.

Location

Nearly five miles of hiking separate the source from the nearest road, and that road has no name on file. Forest Service ground, no wilderness designation recorded. Mid elevation for central Idaho, cold on average, and snowy, with a snowfall figure north of a hundred inches. No fee is noted, and the trail itself goes undescribed.

The record names winter, a hard call with a long approach through deep snow. For camping, the record has Johnson Creek Guard Station, about nineteen miles out. The water will scald on contact. Do not get in at the source. The chemistry sample is from 1979 and the access class on record is a hike.

Terrain

Aircraft with laser scanners measured this ground to within inches. The scan strips out trees and buildings, leaving the bare shape of the land around Middle Fork Indian Creek Hot Spring.

Setting
Canyon floor
Steep ground climbs away on both sides of the spring.
Highest ground nearby
583 ft above the spring
Within a quarter mile, to the east
Cross-section through the spring

A slice through the ground from southwest to northeast, about 0.6 miles end to end.

Elevation data: USGS 3D Elevation Program. Aerial imagery: USGS The National Map. Public domain.

Heat Below
120 milliwatts per square meter of heat flow

That's about twice the US average of 65. It's higher than at 71% of the springs on this site.

Heat flow measures the warmth working its way up through the ground from deep inside the earth. Where it runs high, rain and snowmelt that seep down through cracks in the rock come back up hot.

Heat flow estimate: Stanford Thermal Earth Model (Aljubran & Horne, 2024), CC BY 4.0.

Monthly Climate
23°
Jan
25°
Feb
32°
Mar
37°
Apr
45°
May
56°
Jun
67°
Jul
66°
Aug
56°
Sep
42°
Oct
29°
Nov
20°
Dec
Annual Precip: 23.5 in Annual Snow: 107.9 in
Best Time to Visit
December Air 20°F · Water 162°F · +142° contrast
January Air 23°F · Water 162°F · +139° contrast
February Air 25°F · Water 162°F · +137° contrast
December offers 47°F more contrast than July
Current Conditions
32°F
Clear N 0.0 mph 93% Good soaking weather
Today 68° Low 42° Sunny
Spring is +94° warmer
Wednesday 73° Low 47° Sunny
Spring is +89° warmer
Thursday 67° Low 45° Rain Showers 82% precip
Spring is +95° warmer
Friday 67° Low 43° Chance Rain Showers 47% precip
Spring is +95° warmer
Saturday 70° Low 44° Sunny 9% precip
Spring is +92° warmer
Water Chemistry Sampled 1979-07-31

The water at Middle Fork Indian Creek Hot Spring is alkaline (pH 9.0).

pH 9.0 Alkaline
pH influences mineral absorption through skin
Calcium 2 mg/L
May support bone density and joint health
Sodium 110 mg/L
Supports circulation and skin hydration
Sulfate 66 mg/L
Traditionally used for skin conditions and inflammation
Chloride 11 mg/L
Natural antiseptic with skin health benefits
Where to Stay

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Nearby Camping
Johnson Creek Guard Station 19.1 mi away

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...

Reservable Yes
Reserve on Recreation.gov →
Mile-High Advisory 5,438 ft

Middle Fork Indian Creek Hot Spring sits at 5,438 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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Temperature
162°F
Warm Hot Boiling
Water Temp 162°F (72°C)
Avg Air Temp 42°F
Above Ambient +120°F
Great soaking conditions September
Access
Open
Road Access Hike
Distance to Road 4.8 mi
Land
Ownership Federal
Agency US Forest Service
Designation National Forest
Unit Boise National Forest
Manager US Forest Service
Protection 3 - Protected, subject to extractive use
Frequently Asked Questions
What is the water temperature at Middle Fork Indian Creek Hot Spring?
Middle Fork Indian Creek Hot Spring has a water temperature of 162°F (72°C). This is considered a hot spring, well above body temperature.
Where is Middle Fork Indian Creek Hot Spring located?
Middle Fork Indian Creek Hot Spring is located in Custer County, Idaho at 5,438 feet elevation, near Challis. Coordinates: 44.8130°N, 115.1230°W.
How do I get to Middle Fork Indian Creek Hot Spring?
Middle Fork Indian Creek Hot Spring has Hike road access (4.8 mi from the road).
Is Middle Fork Indian Creek Hot Spring free to visit?
Middle Fork Indian Creek Hot Spring has Open access. It is managed by US Forest Service.
Can I camp near Middle Fork Indian Creek Hot Spring?
Yes, Johnson Creek Guard Station is located nearby (19.1 miles away).
What minerals are in the water at Middle Fork Indian Creek Hot Spring?
Water chemistry analysis shows the presence of pH, Calcium, Sodium, Sulfate, Chloride. The pH is 9.0 (alkaline).
Is it safe to soak at Middle Fork Indian Creek Hot Spring?
No, not at the source. The water at Middle Fork Indian Creek Hot Spring reaches 162°F, which can cause severe burns within seconds. Look for cooled side pools or downstream stretches, and test with a hand before anything else.
Sources: USGS NWIS