# Spring In Oneill Forebay, California

Spring In Oneill Forebay in California. 70°F (21°C). Short Walk · Public Land. Merced County.

- Page: https://www.soakingsprings.com/hot-springs/california/spring-in-oneill-forebay
- Source: Soaking Springs, researched and maintained by Armen Suny
- Updated: 2026-09-14

## Can you soak at Spring In Oneill Forebay?

The water leaves the ground at 70°F, about as warm as a heated pool. It's a short walk from the road. We haven't confirmed whether it has a pool or charges a fee.

## Key facts

| Fact | Value |
|---|---|
| Source water temperature | 70°F (21°C) (USGS record; developed pools are often cooled) |
| Elevation | 223 ft |
| Access | Short Walk · Public Land, 0.2 mi from the nearest road |
| Land | San Luis Reservoir State Recreation Area, SPR |
| County | Merced County |
| Nearest town | Gustine |
| Coordinates | 37.08300, -121.04200 |
| Best months to soak | December, January, February (largest gap between water and average air temperature) |

## About Spring In Oneill Forebay

This is an unnamed thermal point sitting in O'Neill Forebay, part of the San Luis Reservoir State Recreation Area in Merced County, about twelve miles from Gustine. The listed name is a location description. The water is barely warm. Access is open, and the land belongs to the Bureau of Reclamation and is run as a state recreation area.

Flat valley ground, low, a few hundred yards from the road. Dry country: about eleven inches of rain a year and no snow. The surrounding land is federal, managed within the San Luis Reservoir State Recreation Area, which means recreation area rules apply. The forebay itself is the reference point; the file names no road.

The file favors winter, and the climate would allow any month. The water is too cool for a soak in any real sense. Access is open. No campground and no fee are on record. Check the recreation area for day use rules.

## Nearby

- Nearest city page: [Hot springs near South Dos Palos](https://www.soakingsprings.com/hot-springs/near/california/south-dos-palos), 28 mi away
- State page: [Hot springs in California](https://www.soakingsprings.com/hot-springs/california)
- [Iridat Spring, CA](https://www.soakingsprings.com/hot-springs/california/iridat-spring): 73°F source, Roadside, near Los Banos, Merced County
- [Spring, CA](https://www.soakingsprings.com/hot-springs/california/spring-merced-county): 81°F source, Short Walk, near Los Banos, Merced County
- [Gilroy Hot Springs, CA](https://www.soakingsprings.com/hot-springs/california/gilroy-hot-springs): 106°F source, Roadside, near San Martin, Santa Clara County
- [Mercey Hot Springs, CA](https://www.soakingsprings.com/hot-springs/california/mercey-hot-springs): 119°F source, Roadside, near South Dos Palos, Merced County
- [Salt Grass Springs, CA](https://www.soakingsprings.com/hot-springs/california/salt-grass-springs): 73°F source, Short Walk, near Patterson, Stanislaus County
- [Sargent Estate Warm Spring, CA](https://www.soakingsprings.com/hot-springs/california/sargent-estate-warm-spring): 77°F source, Short Walk, near Gilroy, Santa Clara County

## Questions

**What is the water temperature at Spring In Oneill Forebay?**
Spring In Oneill Forebay has a water temperature of 70°F (21°C). This is a warm thermal spring.

**Where is Spring In Oneill Forebay located?**
Spring In Oneill Forebay is located in Merced County, California at 223 feet elevation, near Gustine. Coordinates: 37.0830°N, 121.0420°W.

**How do I get to Spring In Oneill Forebay?**
Spring In Oneill Forebay has Short Walk road access (0.2 mi from the road).

**Is Spring In Oneill Forebay free to visit?**
Spring In Oneill Forebay has Open access. It is managed by Bureau of Reclamation.

## Sources

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