Sulphur Creek
Sulphur Creek flows at 120 degrees in Lake County near Cobb at 2,039 feet elevation in the forested Mayacamas Range, just 89 meters from the nearest road and essentially roadside accessible. The spring provides water 61.7 degrees warmer than the ambient temperature of 58 degrees.
The spring sits in dense coniferous and hardwood forest characteristic of the inner northern California Coast Ranges. The relatively high elevation and abundant precipitation (34.4 inches annually) create a lush, green landscape distinct from lower-elevation springs. The water emerges in a forested setting where scattered trees shade the pools.
The spring reflects geothermal activity in the Mayacamas Range, a north-south trending mountain range created by strike-slip faulting and crustal deformation. The range's elevated geothermal gradient results from heat flow associated with ongoing tectonism in the California Coast Ranges.
Roadside accessibility makes this spring immediately approachable with minimal walking. The forested setting and high precipitation create a cooler, wetter environment than most California springs—winter snow can occasionally block access though melts quickly. Warm Springs Recreation Area lies 20.8 kilometers south as a day-use facility.
Is Sulphur Creek worth visiting?
Best for
- Hot spring soaking
- Easy day trips
- Overnight camping trips
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Overview Warm Springs Recreation Area is a day-use park located at Lake Sonoma, which is just a 45 minute drive north of Santa Rosa and a 2 hour trip from San Francisco. There is no overnight camping available at this facility World famous vineyards and a land rich in history surround the lake, where visitors enjoy boating, fishing and exploring the area's extensive trail network.Recreation The Woodland Ridge Nature Trail begins at the park and winds up the ridge, rewarding hikers with great...