# Casa Diablo Hot Springs And Geyser, California

Casa Diablo Hot Springs And Geyser in California. 199°F (93°C). Short Walk · Public Land. Mono County.

- Page: https://www.soakingsprings.com/hot-springs/california/casa-diablo-hot-springs-and-geyser
- Source: Soaking Springs, researched and maintained by Armen Suny
- Updated: 2026-09-14

## Can you soak at Casa Diablo Hot Springs And Geyser?

No. The water at Casa Diablo Hot Springs And Geyser reaches 199°F, hot enough to scald.

## Key facts

| Fact | Value |
|---|---|
| Source water temperature | 199°F (93°C) (USGS record; developed pools are often cooled) |
| pH | 6.8 (Neutral) |
| Total dissolved solids | 967 mg/L |
| Elevation | 7,418 ft |
| Access | Short Walk · Public Land, 0.1 mi from the nearest road (Casa Diablo Cutoff) |
| Land | Inyo National Forest, US Forest Service |
| County | Mono County |
| Nearest town | Mammoth Lakes |
| Coordinates | 37.64800, -118.91400 |
| Best months to soak | December, February, January (largest gap between water and average air temperature) |
| Nearest campground | SHERWIN CREEK, 1.9 mi |

## Soaking safety

**Geyser: Not a Soaking Spring.** Casa Diablo Hot Springs And Geyser is a geyser, not a traditional hot spring. These geothermal features can be extremely dangerous. Boiling water, toxic gases, and unstable ground are common hazards. Do not attempt to soak.

## About Casa Diablo Hot Springs And Geyser

Casa Diablo Hot Springs and Geyser is an active geothermal area in the Inyo National Forest, Mono County, a little over four miles from Mammoth Lakes. The water sits at boiling point. Public access is open on Forest Service ground. Casa Diablo Cutoff passes within six hundred feet or so, which the record classes as a short walk.

A little under seventy-four hundred feet, with eight feet or more of snow most winters and modest precipitation otherwise. From the cutoff it is a short walk. National Forest, no further designation. Sherwin Creek campground is under two miles off, and Mammoth Lakes is only a few miles further. The snow total is the number that matters for timing.

Wikipedia describes Casa Diablo Hot Springs as a hot springs and active geothermal site near Mammoth Lakes in the Eastern Sierra.

December through February show up as the listed months, which means snow. The water will scald anyone who touches it. Sherwin Creek is the closest camping, about two miles. A 1984 USGS sample put it near neutral with high dissolved solids and iron present. No fee recorded.

## Water chemistry

Lab sample from 1984-05-09 (Water Quality Portal).

| Measure | Value |
|---|---|
| pH | 6.8 |
| Total dissolved solids | 967 mg/L |
| Calcium | 2.4 mg/L |
| Magnesium | 0.4 mg/L |
| Sodium | 230 mg/L |
| Sulfate | 160 mg/L |
| Chloride | 240 mg/L |
| Iron | 100 µg/L |

## Nearby

- Nearest city page: [Hot springs near Clovis](https://www.soakingsprings.com/hot-springs/near/california/clovis), 71 mi away
- State page: [Hot springs in California](https://www.soakingsprings.com/hot-springs/california)
- [Unnamed thermal spring, CA](https://www.soakingsprings.com/hot-springs/california/unnamed-spring-mono-county-2): 72°F source, pH 7.5, TDS 1,100 mg/L, Roadside, near Mammoth Lakes, Mono County
- [Chance Spring, CA](https://www.soakingsprings.com/hot-springs/california/chance-spring): 73°F source, pH 8.7, TDS 1,410 mg/L, Short Walk, near Mammoth Lakes, Mono County
- [Casa Diablo Hot Pool, CA](https://www.soakingsprings.com/hot-springs/california/casa-diablo-hot-pool): 165°F source, pH 7.7, TDS 1,230 mg/L, Short Walk, near Mammoth Lakes, Mono County
- [Hot Creek Springs, CA](https://www.soakingsprings.com/hot-springs/california/hot-creek-springs-1): 171°F source, pH 8.7, Roadside, near Mammoth Lakes, Mono County
- [Hot Creek Gorge Springs, CA](https://www.soakingsprings.com/hot-springs/california/hot-creek-gorge-springs): 199°F source, pH 8.0, TDS 1,170 mg/L, Short Walk, near Mammoth Lakes, Mono County
- [Little Hot Creek Spring, CA](https://www.soakingsprings.com/hot-springs/california/little-hot-creek-spring): 180°F source, pH 7.8, TDS 1,230 mg/L, Short Walk, near Mammoth Lakes, Mono County

## Questions

**What is the water temperature at Casa Diablo Hot Springs And Geyser?**
Casa Diablo Hot Springs And Geyser has a water temperature of 199°F (93°C). This is considered a hot spring, well above body temperature.

**Where is Casa Diablo Hot Springs And Geyser located?**
Casa Diablo Hot Springs And Geyser is located in Mono County, California at 7,418 feet elevation, near Mammoth Lakes. Coordinates: 37.6480°N, 118.9140°W.

**How do I get to Casa Diablo Hot Springs And Geyser?**
Casa Diablo Hot Springs And Geyser has Short Walk road access, with the nearest road being Casa Diablo Cutoff (0.1 mi from the road).

**Is Casa Diablo Hot Springs And Geyser free to visit?**
Casa Diablo Hot Springs And Geyser has Open access. It is managed by US Forest Service.

**Can I camp near Casa Diablo Hot Springs And Geyser?**
Yes, Sherwin Creek is located nearby (1.9 miles away).

**What minerals are in the water at Casa Diablo Hot Springs And Geyser?**
Water chemistry analysis shows the presence of pH, Total Dissolved Solids, Calcium, Magnesium, Sodium, Sulfate, Chloride, Iron. The pH is 6.8 (neutral). Total dissolved solids measure 967 mg/L.

**Is it safe to soak at Casa Diablo Hot Springs And Geyser?**
No, not at the source. The water at Casa Diablo Hot Springs And Geyser reaches 199°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 thermal springs records, Water Quality Portal lab analyses, OpenStreetMap, Wikipedia/Wikidata, NOAA climate normals
- https://en.wikipedia.org/wiki/Casa_Diablo_Hot_Springs