Dehy Hot Spring
Dehy Hot Spring flows at an impressive 134°F (57°C) from BLM land near Mammoth Lakes, where water emerges 87 degrees above the ambient mountain temperature of 46.6°F. Located at 6,889 feet elevation in the Long Valley geothermal area, this substantial thermal anomaly represents significant geothermal resource potential.
The spring requires a walk of approximately 3,012 feet from Pit Road through high-altitude terrain where seasonal snow reaches 72 inches annually. The remote setting combines volcanic geology with high elevation forest, creating harsh conditions where the thermal spring provides an island of warmth in the alpine landscape.
The spring requires a substantial walk of roughly 3,000 feet and sits at 6,889 feet elevation, accessible only in summer and fall when snow clears the terrain. BLM land designation allows public access. Crowley Lake Campground 12.2 kilometers away offers 47 reservable RV and tent sites with potable water and dump station. Plan for alpine conditions with sudden weather changes.
Dehy Hot Spring sits within the Long Valley geothermal system, a region of intense scientific interest due to earthquake history and geothermal activity. The spring emerges from deep thermal fractures in volcanic rock, representing groundwater heated by proximity to geothermal resources at depth.
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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Springs Near Dehy Hot Spring
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Slightly Alkaline Springs (pH ~7.7)
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