Unnamed Thermal Spring
Nobody has named this thermal point, which sits on San Bernardino National Forest land five or so miles from Mentone. The water is warm, right at the edge of soaking temperature. It is not quite a mile from Santa Ana Truck Road, on Forest Service ground with open access. No name and no photo; the record is thin beyond the basics.
Dry foothills at about 2,300 feet, with light snow. Santa Ana Truck Road is the nearest road, nine tenths of a mile away. National Forest land with no further designation. Green Valley campground is around eight miles off, the closest camp in the record.
December through February is what the record lists. A short walk off the truck road. Camp at Green Valley. No fee on file. The Forest Service has it as open. Temperature is on the low side of soakable, so on a cold morning it may feel cooler than you want.
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
- Canyon floor
- Steep ground climbs away on both sides of the spring.
- Highest ground nearby
- 797 ft above the spring
- Within a quarter mile, to the southeast
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 1½ times the US average of 65. It's higher than at 56% 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 Green Valley Campground is located near Arrowbear in the San Bernardino National Forest in Southern California. It is centered between Lake Arrowhead and Big Bear Lake, providing ample recreational opportunities in the area's pine-covered mountains. Green Valley Lake, known for its exceptional trout fishing, is located about a mile from this beautiful mountain campground.Recreation Green Valley Lake, which is known for its trout fishing, is located just minutes away. Boating and swim...
this spring is road-accessible, so you can bring more gear.
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