# Robinson Bar Hot Springs, Idaho

Robinson Bar Hot Springs in Idaho. 131°F (55°C). Roadside. Custer County.

- Page: https://www.soakingsprings.com/hot-springs/idaho/robinson-bar-hot-springs
- Source: Soaking Springs, researched and maintained by Armen Suny
- Updated: 2026-09-14

## Can you soak at Robinson Bar Hot Springs?

Only once it cools. The water leaves the ground at 131°F, hotter than any hot tub. You can drive right up to it. We haven't confirmed whether it has a pool or charges a fee.

## Key facts

| Fact | Value |
|---|---|
| Source water temperature | 131°F (55°C) (USGS record; developed pools are often cooled) |
| pH | 9.4 (Alkaline) |
| Total dissolved solids | 294 mg/L |
| Elevation | 5,960 ft |
| Access | Roadside, 231 ft from the nearest road (National Forest Development Road 454) |
| County | Custer County |
| Nearest town | Challis |
| Coordinates | 44.24700, -114.67600 |
| Best months to soak | December, January, February (largest gap between water and average air temperature) |
| Nearest campground | Pole Flat Campground, 4.5 mi |

## About Robinson Bar Hot Springs

Robinson Bar Hot Springs is in Custer County, about 28 miles from Challis. Hot water, well over comfortable soaking, with moderate dissolved solids and some iron in the 1979 sample. Who owns it is not on file, nor is any access status, so this one needs checking before you plan around it.

National Forest Development Road 454 passes a couple hundred feet from the spring, so the approach is roadside. The country is high, with a year round average a little above freezing and ten feet of snow in an average winter. Precipitation is moderate. The road number says forest, but the record stops short of naming a land owner.

Pole Flat Campground is four or five miles off. The record says go in winter. Ownership and access are unconfirmed, so find out. Temperature is high enough to scald if the source is unmixed; test the water. The sample is from 1979 and showed iron along with the usual minerals.

## Water chemistry

Lab sample from 1979-09-13 (Water Quality Portal).

| Measure | Value |
|---|---|
| pH | 9.4 |
| Total dissolved solids | 294 mg/L |
| Calcium | 1.9 mg/L |
| Magnesium | 0.3 mg/L |
| Sodium | 74 mg/L |
| Sulfate | 50 mg/L |
| Chloride | 15 mg/L |
| Iron | 80 µg/L |

## Nearby

- Nearest city page: [Hot springs near Challis](https://www.soakingsprings.com/hot-springs/near/idaho/challis), 7 mi away
- State page: [Hot springs in Idaho](https://www.soakingsprings.com/hot-springs/idaho)
- [Sunbeam Hot Springs, ID](https://www.soakingsprings.com/hot-springs/idaho/sunbeam-hot-springs): 169°F source, pH 9.0, TDS 291 mg/L, Roadside, near Challis, Custer County, primitive pools, pools 100–110°F, free, year-round
- [Slate Creek Hot Spring, ID](https://www.soakingsprings.com/hot-springs/idaho/slate-creek-hot-spring): 122°F source, pH 8.8, TDS 352 mg/L, Short Walk, near Challis, Custer County, primitive pools, free, jul-oct best
- [Basin Creek Hot Spring, ID](https://www.soakingsprings.com/hot-springs/idaho/basin-creek-hot-spring): 133°F source, pH 9.5, Roadside, near Challis, Custer County, primitive pools, jun–oct
- [Mormon Bend Hot Spring, ID](https://www.soakingsprings.com/hot-springs/idaho/mormon-bend-hot-spring): 100°F source, Short Walk, near Challis, Custer County, primitive pools, free, jul-oct
- [Elkhorn Hot Spring, ID](https://www.soakingsprings.com/hot-springs/idaho/elkhorn-hot-spring): 136°F source, Roadside, near Challis, Custer County, primitive pools, free, year-round
- [Sullivan Hot Springs, ID](https://www.soakingsprings.com/hot-springs/idaho/sullivan-hot-springs): 106°F source, pH 6.9, TDS 684 mg/L, Roadside, near Challis, Custer County

## Questions

**What is the water temperature at Robinson Bar Hot Springs?**
Robinson Bar Hot Springs has a water temperature of 131°F (55°C). This is considered a hot spring, well above body temperature.

**Where is Robinson Bar Hot Springs located?**
Robinson Bar Hot Springs is located in Custer County, Idaho at 5,960 feet elevation, near Challis. Coordinates: 44.2470°N, 114.6760°W.

**How do I get to Robinson Bar Hot Springs?**
Robinson Bar Hot Springs has Roadside road access, with the nearest road being National Forest Development Road 454 (231 ft from the road).

**Can I camp near Robinson Bar Hot Springs?**
Yes, Pole Flat Campground is located nearby (4.5 miles away).

**What minerals are in the water at Robinson Bar Hot Springs?**
Water chemistry analysis shows the presence of pH, Total Dissolved Solids, Calcium, Magnesium, Sodium, Sulfate, Chloride, Iron. The pH is 9.4 (alkaline). Total dissolved solids measure 294 mg/L.

**Is it safe to soak at Robinson Bar Hot Springs?**
With care. At 131°F Robinson Bar Hot Springs is hot enough to need short sessions, fifteen to twenty minutes, and plenty of water. Enter slowly and get out if you feel light-headed.

## Sources

- USGS thermal springs records, Water Quality Portal lab analyses, OpenStreetMap, Wikipedia/Wikidata, NOAA climate normals