Hilltop Hot Spring
Hilltop Hot Spring produces 127°F water at 6,880 feet elevation in Mono County, just a short distance from Mammoth Lakes. Also known as Alkali Hot Springs, it runs 80°F above ambient temperature on the high desert edge, managed by the Bureau of Land Management.
The spring emerges from high desert terrain in a cool mountain environment where winter snow accumulates substantially. The thermal feature sits on public land administered by the BLM, with Benton Crossing Road just 16 meters away providing roadside access. The landscape transitions between exposed rock, sagebrush, and sparse alpine vegetation.
This roadside spring sits just 54 feet from the nearest road, offering direct access. Winter brings heavy snow around 72 inches annually, making seasonal access challenging. The alpine climate averages 47°F with modest precipitation. Nearby Crowley Lake Campground offers convenient overnight facilities 11 kilometers away.
Hilltop Hot Spring draws its heat from deep crustal sources that power geothermal systems throughout the Eastern Sierra. Known locally as Alkali Hot Springs, the feature reflects the region's complex geothermal and hydrological history. Recent USGS analysis identified water chemistry with notable sodium and chloride content.
The water at Hilltop Hot Spring is neutral (pH 7.0) with 1260 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).
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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...
Hilltop Hot Spring sits at 6,880 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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Hilltop Hot Spring is road-accessible, so you can bring more gear. The water runs hot, so extra hydration is key.
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