Unnamed Thermal Spring
Kenwood, in the Sonoma Valley, has an unnamed spring a couple of miles out that the USGS sampled in 2003 and found tepid. The water came out in the low seventies, about what a shaded swimming pool runs, which puts it in seep territory. Nobody has noted whose land it is or if the public is allowed in, and the only name it carries is the USGS site number.
A short walk off Keiser Lane, under five hundred feet, gets you there on paper. Low country, a few hundred feet above sea level, with wet winters and bone-dry summers. Some 27 inches of rain annually, nearly all of it in the cool months, and no snow worth mentioning. The owner and the access status are empty in the record, so the walk may cross private ground.
The season on the list runs December through February, cold enough air that tepid water passes for warm. Nobody recorded who controls the land, so ask around before you walk in off Keiser Lane. The 2003 sample came back fairly high in dissolved solids; the chemistry block carries the number. Camping is thin here. Oak Shores sits more than twenty miles out and it is day use anyway.
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
- Gentle slope
- The ground tilts gently up to the northwest.
- Highest ground nearby
- 153 ft above the spring
- Within a quarter mile, to the northwest
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 2½ times the US average of 65. It's higher than at 97% 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.
The water at This spring contains 641 mg/L total dissolved solids.
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Overview Nestled between Blue Ridge and Cedar Roughs east of Napa Valley, Lake Berryessa provides ample public recreation opportunities. Popular activities on and around the large, yet uncrowded lake include fishing, boating, water skiing, wake boarding, jet skiing, sailing, swimming, kayaking, canoeing, wildlife viewing, hiking, biking and picnicking. The Dufer Point Visitor Center offers year-round interpretive events and exhibits highlighting natural and cultural resources. Lake Berrye...
this spring is road-accessible, so you can bring more gear.
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