File:Casa Diablo IV geothermal (51874435703).jpg — public domain
At 7,313 feet elevation, this 72-degree thermal spring near Mammoth Lakes flows just 45 meters from El Camino Sierra Road in harsh alpine terrain where winter temperatures plunge well below freezing. The 28-degree temperature gain above ambient becomes particularly significant in this extreme climate.
The spring emerges in high Sierra Nevada country where massive granite peaks dominate the landscape. Cold alpine air descends from surrounding ridges, creating stark contrast with the warm thermal water rising from rocky ground. Dense lodgepole pine and whitebark pine scatter across volcanic terrain below jagged summits.
History of This Spring
This spring flows on lands managed by the Los Angeles Department of Water and Power, reflecting the Los Angeles Aqueduct system that diverts Eastern Sierra water to distant urban users. The spring's geothermal origin traces to ancient volcanic activity along the Sierra's eastern escarpment, where ongoing tectonic stress maintains thermal conditions.
Access is straightforward from nearby El Camino Sierra Road with minimal hiking. Winter snows exceeding 98 inches annually make November through April a serious backcountry challenge requiring proper winter gear. Summer and early fall provide ideal conditions for thermal soaking with alpine scenery.
Is this spring worth visiting?
Best for
- Easy day trips
- Overnight camping trips
- Mineral-rich therapeutic bathing
This spring is well suited for easy day trips and overnight camping trips.
Annual Precip: 18.3 in
Annual Snow: 98.5 in
December
Air 26°F · Water 72°F · +46° contrast
February
Air 27°F · Water 72°F · +45° contrast
January
Air 28°F · Water 72°F · +44° contrast
December offers 40°F more contrast than July
Recent Temperature
184.6°F
(84.8°C)
Measured Oct 04, 1983
The water at This spring is slightly alkaline (pH 7.5) with 1100 mg/L total dissolved solids. It is notably rich in sodium (supports circulation and skin hydration), chloride (natural antiseptic with skin health benefits), and total dissolved solids (higher mineral concentration for therapeutic soaking).
pH influences mineral absorption through skin
Higher mineral concentration for therapeutic soaking
May support bone density and joint health
Known for muscle relaxation and stress relief
Supports circulation and skin hydration
Traditionally used for skin conditions and inflammation
Natural antiseptic with skin health benefits
Overview
Sherwin Creek Campground is located in the eastern Sierra Nevada Mountains within 2 miles of the full-service community of Mammoth Lakes, California. Popular among anglers, hikers, off-road vehicle enthusiasts and photographers, the campground is near some of the most spectacular wilderness and outdoor recreation areas in the Sierras.Recreation
With a motocross track and trails, Sherwin Creek is a hot spot for off-road vehicle enthusiasts. The area's majestic scenery and challenging...
Reserve on Recreation.gov →
Swimsuit & towel
Water bottle
Stay hydrated, especially in hot water
Warm layers
Cold air before and after soaking
Camping gear
Nearby camping at Sherwin Creek
Trash bag
Pack out what you pack in
29 miles from Mammoth Lakes, CA
USGS Quad: (MT. MORRISON 15) · Circ 790: 56.0 · NOAA: 12.0 · AMS Map: MARIPOSA
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.
Is it safe to soak at ?
is generally safe for soaking at its recorded temperature. Always tell someone your plans before visiting remote hot springs.
Is crowded?
is accessible from a paved road, making it easy to reach. Weekends and holidays may be busier — consider visiting on a weekday for a quieter experience.
What should I bring to ?
Essentials for : swimsuit, towel, water bottle, warm layers for before and after soaking, camping gear, a trash bag to pack out what you pack in.