Dehy Hot Spring
Drag the handle to compare the two views. The orange dot marks the spring, in a frame about three quarters of a mile wide.
On BLM land in Mono County, about eleven miles from Mammoth Lakes, Dehy Hot Spring comes out of the ground far too hot to sit in, up in the range where you would burn yourself, and the measured flow is a trickle. Access is open. This is Bishop Field Office public land, high desert at nearly seven thousand feet.
High country on the east flank of the Sierra. Pit Road is the nearest road, and the spring lies a little over half a mile from it. Winters are heavy, six feet of snow in an average year, so winter access means snow. Rain is scant. Crowley Lake Campground is the listed camping, and the BLM Field Office in Bishop manages the ground.
the record lists December through February as best months, which is odd for a place with six feet of snow, so weigh that against the snowfall figure. Open access on BLM land. It is hot enough to burn skin; keep fingers out until you have measured it. Flow is tiny. The temperature and pH date to a 1973 survey.
Aircraft with laser scanners measured this ground to within inches. The scan strips out trees and buildings, leaving the bare shape of the land around Dehy Hot Spring.
- Setting
- Gentle slope
- The ground tilts gently up to the west.
- Highest ground nearby
- 61 ft above the spring
- Within a quarter mile, to the west
A slice through the ground from northwest to southeast, about 0.6 miles end to end.
Elevation data: USGS 3D Elevation Program. Aerial imagery: USGS The National Map. Public domain.
That's about twice the US average of 65. It's higher than at 80% of the springs on this site.
Heat flow measures the warmth working its way up through the ground from deep inside the earth. Where it runs high, rain and snowmelt that seep down through cracks in the rock come back up hot.
See every spring on the geothermal heat map →
Heat flow estimate: Stanford Thermal Earth Model (Aljubran & Horne, 2024), CC BY 4.0.
The water at Dehy Hot Spring is slightly alkaline (pH 7.7). It is notably rich in sodium (supports circulation and skin hydration) and chloride (natural antiseptic with skin health benefits).
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Overview Crowley Lake Campground offers 47 RV/tent sites, maximum recommended RV length is 30 feet. All sites include a fire pit, picnic table and a lantern holder. No hook-up. Potable water is available. Dump station fee is $10.00, no passes accepted. Closest amenities are 2 miles south in Crowley, or 10 miles north in Mammoth Lakes. Recreation Popular activities include lake and stream fishing, boating, windsurfing, horseback riding, hiking, and wildlife viewing. Facilities Crowley Lake...
Dehy Hot Spring sits at 6,889 feet above sea level, way above the mile-high mark. You may not feel the altitude strongly, but hot water still dehydrates you faster at elevation. UV is about 28% stronger than at sea level, so bring sunscreen and drink more water than you normally would.
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Dehy Hot Spring is road-accessible, so you can bring more gear. The water runs hot, so extra hydration is key.
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