Sulphur Spring
A second Sulphur Spring, this one in Contra Costa County at Waldon, barely above sea level. The water came out tepid, mid seventies. It sits about a hundred feet from a road. On file, the owner line is empty and access is unconfirmed. Resolve that first.
The road is unnamed on file and the spring sits beside it. Waldon is listed at zero miles, so the spring is in town or on its fringe. Snow-free, seventeen inches of rain, an annual average around sixty.
January, December and February are the months on record. The nearest camping on file is an overnight anchorage for sailing vessels twenty-two miles away, which tells you there is no real campground nearby. No fee is listed. Tepid water, no heat risk.
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 Sulphur 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
- 55 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 1½ times the US average of 65. It's higher than at 54% 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 Aquatic Park Cove is a vibrantly urban harbor that mimics a natural anchorage and is located on the Pacific shores of one of America's great West Coast cities. San Francisco Maritime National Historical Park's Aquatic Park Cove is the small craft gateway to San Francisco. Vessels entering Aquatic Park Cove are instructed to contact the Park's permit officer on VHF marine radio channel 83A (157.175Mhz) using the call sign "Aquatic Park NPS" followed by transmission of the vessel'...
Sulphur Spring is road-accessible, so you can bring more gear.
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