Unnamed Thermal Spring
Thirteen or so miles out of Mammoth Lakes, a warm spring without a name in Mono County, on ground held by Los Angeles's water and power department. The temperature on file is 86 degrees, tepid, a little under body heat. The access status on record is open and the USGS keeps a site number for it. No photograph on file.
No road name is given, only that the spring is under three hundred feet from one, a roadside stop. Elevation is around sixty-eight hundred feet. Snow comes to six feet in an average winter and yearly precipitation is about fifteen inches. The land is held by a city utility, with the record showing no designation beyond that.
Every recommended month on file falls in winter. Crowley Lake Campground is about five miles off. Nothing is recorded about a fee or chemistry, and the temperature could be from an old survey. Eighty-six degrees is below body heat, so nobody will overheat in it.
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 this 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.
- Setting
- Open ground
- Flat, open ground all around.
- Highest ground nearby
- 43 ft above the spring
- Within a quarter mile, to the southwest
A slice through the ground from southwest to northeast, 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 83% 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.
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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...
this spring sits at 6,800 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 27% stronger than at sea level, so bring sunscreen and drink more water than you normally would.
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this spring is road-accessible, so you can bring more gear.
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