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.
File:Casa Diablo IV geothermal (51874435703).jpg — public domain
Casa Diablo Hot Springs and Geyser erupts at 199 degrees Fahrenheit—one of California's most extreme geothermal features. Located at 7,418 feet elevation within the Inyo National Forest, this active thermal system represents rare geothermal dynamism in the Sierra high country.
The geyser sits 182 feet from Casa Diablo Cutoff road, accessible by a short foothill walk through alpine meadows and sparse whitebark pine. Boiling water erupts from the ground surface with audible steam discharge and colorful mineral deposits, creating a landscape that feels extraterrestrial compared to the surrounding wilderness.
History of Casa Diablo Hot Springs And Geyser
Casa Diablo Hot Springs sits atop the Long Valley Caldera, a major geothermal field with documented heat flow anomalies and subsurface reservoirs. Recent USGS analysis shows water chemistry distinctly different from Casa Diablo Hot Pool—lower calcium but elevated sodium (230 mg/L)—indicating distinct thermal reservoirs and flow paths.
This is an active, dangerous thermal feature. Observe from marked safe zones only and keep clear of boiling pools and steam vents. Access is seasonal—July through September for road access and weather. Sherwin Creek Campground (3 kilometers away) offers nearby camping. Check with local authorities for any seasonal closures.|
Is Casa Diablo Hot Springs And Geyser worth visiting?
Best for
- Observing powerful hot springs
- Overnight camping trips
Casa Diablo Hot Springs And Geyser is well suited for observing powerful hot springs and overnight camping trips.
Annual Precip: 18.3 in
Annual Snow: 98.5 in
December
Air 25°F · Water 199°F · +174° contrast
February
Air 27°F · Water 199°F · +172° contrast
January
Air 28°F · Water 199°F · +171° contrast
December offers 40°F more contrast than July
Recent Temperature
196.2°F
(91.2°C)
Measured May 09, 1984
The water at Casa Diablo Hot Springs And Geyser is neutral (pH 6.8) with 967 mg/L total dissolved solids. It is notably rich in chloride (natural antiseptic with skin health benefits).
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
Iron-rich springs may support circulation
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
Water shoes
Hot ground near source
29 miles from Mammoth Lakes, CA
USGS Quad: MT. MORRISON 15 · PP 492: 123.0 · Circ 790: 56.0 · NOAA: 13.0 · AMS Map: MARIPOSA
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?
The water at Casa Diablo Hot Springs And Geyser reaches 199°F, which can cause severe burns. Do not enter the source pool directly — look for cooled side pools or downstream areas where the water has cooled to a safe temperature. Always tell someone your plans before visiting remote hot springs.
Is Casa Diablo Hot Springs And Geyser crowded?
Casa Diablo Hot Springs And Geyser sees varying levels of visitors depending on the season and day of the week.
What should I bring to Casa Diablo Hot Springs And Geyser?
Essentials for Casa Diablo Hot Springs And Geyser: swimsuit, towel, water bottle, warm layers for before and after soaking, camping gear, a trash bag to pack out what you pack in. The water is over 110°F — test the temperature before entering and watch for scalding near the source.