Unnamed Thermal Spring
A warm spring with no name a couple of miles outside the city of Napa, right on Hagen Road. Its water on record is 83 degrees, lukewarm. It carries a USGS site number and has been photographed. Who owns the ground and if anyone may visit are both unrecorded, which matters this close to town.
Fifty feet off Hagen Road, hardly a walk at all. Elevation is about six hundred feet. Snow does not occur, and the year brings about twenty-three inches of rain with a yearly average near sixty degrees. The record shows no land manager and no designation. OpenStreetMap contributes no second name, and there is no fee note.
The season on file is winter. The nearest campground listed is Oak Shores Day Use Area, about seventeen miles out, and by its name it may not allow overnight stays. The landowner is not on record, so confirm access before stopping. No fee or chemistry noted. Eighty-three degrees is warm to the hand and not much more.
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
- Hillside
- The spring sits on a steep slope that climbs to the southeast.
- Highest ground nearby
- 288 ft above the spring
- Within a quarter mile, to the southeast
A slice through the ground from west to east, 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 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.
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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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