Unnamed Thermal 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.
Mendocino National Forest holds this one, about nine miles from Lucerne in Lake County, a spring without a name and with water at ninety degrees. Warm enough for a soak on a cool day. The Forest Service has the land and the record marks it open. Twin Valley Road passes right by.
Twin Valley Road runs a few hundred feet away, so the record files this as roadside. The land designation is National Forest. Elevation is around twenty-two hundred feet. The forest here gets thirty-two inches of precipitation annually and about twenty inches of snow across a winter, enough to matter on a forest road.
Between December and February is the window on record. Letts Lake Campground is around seven miles away. No fee is recorded. The spring sits on open public land, and still there is no chemistry sample on file and no second name. Mind the forecast before driving forest roads in winter.
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.
- Setting
- Canyon floor
- Steep ground climbs away on both sides of the spring.
- Highest ground nearby
- 220 ft above the spring
- Within a quarter mile, to the north
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 3 times the US average of 65. It's higher than at 98% 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.
Overview This location is available on a first-come, first-served basis only. Visitors are required to physically arrive at the campground to purchase and claim a site.Once on-site, you are able to pay for your campsite(s) by scanning a QR code using the Recreation.gov mobile app, and the Scan and Pay feature.In order to utilize Scan & Pay on site, you will need to first download the free Recreation.gov mobile app https://www.recreation.gov/mobile-app prior to your arrival as some remote area...
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