# Unnamed thermal spring, California

Unnamed thermal spring in California. 72°F (22°C). Roadside · Public Land. Mono County.

- Page: https://www.soakingsprings.com/hot-springs/california/unnamed-spring-mono-county-2
- Source: Soaking Springs, researched and maintained by Armen Suny
- Updated: 2026-09-14

## Can you soak at this spring?

The water leaves the ground at 72°F, about as warm as a heated pool. 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 | 72°F (22°C) (USGS record; developed pools are often cooled) |
| pH | 7.5 (Slightly Alkaline) |
| Total dissolved solids | 1,100 mg/L |
| Elevation | 7,313 ft |
| Access | Roadside · Public Land, 149 ft from the nearest road (El Camino Sierra) |
| Land | Los Angeles Department of Water and Power, CITY |
| County | Mono County |
| Nearest town | Mammoth Lakes |
| Coordinates | 37.65300, -118.92500 |
| Best months to soak | December, February, January (largest gap between water and average air temperature) |
| Nearest campground | SHERWIN CREEK, 1.8 mi |

## About Unnamed thermal spring

An unnamed thermal point about four miles from Mammoth Lakes, Mono County, on ground belonging to the Los Angeles water and power department, LADWP. The water reads 72 degrees, tepid, cooler than a summer swimming pool. El Camino Sierra runs right past it. Access is open. Decades ago the USGS sampled the chemistry here.

This is roadside in the plainest sense, about 150 feet from El Camino Sierra. The elevation is high, over seven thousand feet, and the record shows snowfall near eight feet in a typical winter on eighteen inches of precipitation. The landowner is the water utility of the city of Los Angeles.

A USGS site number is attached to this point, and the October 1983 water sample behind it supplies the pH and mineral readings shown on this page. The landowner is LADWP, the Los Angeles water and power department.

Winter months top the list on file. Sherwin Creek campground is under two miles away. The chemistry shown dates to an old sample, with dissolved solids on the high side, so treat those figures as history. No fee is recorded and the land is open. At 72 degrees, this is wading water.

## Water chemistry

Lab sample from 1983-10-04 (Water Quality Portal).

| Measure | Value |
|---|---|
| pH | 7.5 |
| Total dissolved solids | 1,100 mg/L |
| Calcium | 2.4 mg/L |
| Magnesium | 0.04 mg/L |
| Sodium | 330 mg/L |
| Sulfate | 170 mg/L |
| Chloride | 280 mg/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)
- [Casa Diablo Hot Springs And Geyser, CA](https://www.soakingsprings.com/hot-springs/california/casa-diablo-hot-springs-and-geyser): 199°F source, pH 6.8, TDS 967 mg/L, Short Walk, 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 ?**
 has a water temperature of 72°F (22°C). This is a warm thermal spring.

**Where is  located?**
 is located in Mono County, California at 7,313 feet elevation, near Mammoth Lakes. Coordinates: 37.6530°N, 118.9250°W.

**How do I get to ?**
 has Roadside road access, with the nearest road being El Camino Sierra (149 ft from the road).

**Is  free to visit?**
 has Open access. It is managed by CITY.

**Can I camp near ?**
Yes, Sherwin Creek is located nearby (1.8 miles away).

**What minerals are in the water at ?**
Water chemistry analysis shows the presence of pH, Total Dissolved Solids, Calcium, Magnesium, Sodium, Sulfate, Chloride. The pH is 7.5 (slightly alkaline). Total dissolved solids measure 1,100 mg/L.

## Sources

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