# Unnamed thermal spring, California

Unnamed thermal spring in California. 83°F (28°C). Roadside. Napa County.

- Page: https://www.soakingsprings.com/hot-springs/california/unnamed-spring-napa-county
- 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 83°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 | 83°F (28°C) (USGS record; developed pools are often cooled) |
| Elevation | 600 ft |
| Access | Roadside, 50 ft from the nearest road (Hagen Road) |
| County | Napa County |
| Nearest town | Napa |
| Coordinates | 38.32100, -122.27100 |
| Best months to soak | January, December, February (largest gap between water and average air temperature) |
| Nearest campground | OAK SHORES DAY USE AREA (CA), 16.7 mi |

## About Unnamed thermal spring

A warm spring with no name a couple of miles outside the city of Napa, right on Hagen Road. Its water on record is 83 degrees, lukewarm. It carries a USGS site number and has been photographed. Who owns the ground and if anyone may visit are both unrecorded, which matters this close to town.

Fifty feet off Hagen Road, hardly a walk at all. Elevation is about six hundred feet. Snow does not occur, and the year brings about twenty-three inches of rain with a yearly average near sixty degrees. The record shows no land manager and no designation. OpenStreetMap contributes no second name, and there is no fee note.

The season on file is winter. The nearest campground listed is Oak Shores Day Use Area, about seventeen miles out, and by its name it may not allow overnight stays. The landowner is not on record, so confirm access before stopping. No fee or chemistry noted. Eighty-three degrees is warm to the hand and not much more.

## Nearby

- Nearest city page: [Hot springs near American Canyon](https://www.soakingsprings.com/hot-springs/near/california/american-canyon), 10 mi away
- State page: [Hot springs in California](https://www.soakingsprings.com/hot-springs/california)
- [Napa Vichy Springs, CA](https://www.soakingsprings.com/hot-springs/california/napa-vichy-springs): 76°F source, Roadside, near Napa, Napa County
- [Tolenas Springs, CA](https://www.soakingsprings.com/hot-springs/california/tolenas-springs): 68°F source, Short Walk, near Fairfield, Solano County
- [Unnamed thermal spring, CA](https://www.soakingsprings.com/hot-springs/california/unnamed-spring-sonoma-county-2): 70°F source, Roadside, near Eldridge, Sonoma County
- [Napa Rock Soda Spring, Phillips Sod, CA](https://www.soakingsprings.com/hot-springs/california/napa-rock-soda-spring-phillips-sod): 78°F source, Short Walk, near Yountville, Napa County
- [Vallejo White Sulphur Springs, CA](https://www.soakingsprings.com/hot-springs/california/vallejo-white-sulphur-springs): 68°F source, Roadside, near Vallejo, Solano County
- [Los Guilicos Warm Springs, CA](https://www.soakingsprings.com/hot-springs/california/los-guilicos-warm-springs): 88°F source, TDS 640 mg/L, Short Walk, near Kenwood, Sonoma County

## Questions

**What is the water temperature at ?**
 has a water temperature of 83°F (28°C). This is a warm thermal spring.

**Where is  located?**
 is located in Napa County, California at 600 feet elevation, near Napa. Coordinates: 38.3210°N, 122.2710°W.

**How do I get to ?**
 has Roadside road access, with the nearest road being Hagen Road (50 ft from the road).

**Can I camp near ?**
Yes, Oak Shores Day Use Area (Ca) is located nearby (16.7 miles away).

## Sources

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