Unnamed Thermal Spring
Near Cold Springs at 4,315 feet, this remarkable 108-degree spring exceeds ambient temperatures by 55 degrees, flowing just 77.6 meters from Route 395 at the interface of mountain and desert.
You approach this spring via a brief walk from the busy north-south corridor of Route 395 where travelers cross from the Sierra Nevada into the Great Basin. The landscape transitions from pinyon-juniper forest to high-elevation sagebrush. The spring's intensely hot water steams visibly in cool mountain air, producing dramatic plumes that rise above the surrounding terrain. Snow often blankets the area in winter.
This spring sits at the boundary between California's wet Sierra Nevada range and the cold, dry Great Basin plateau. The exceptional heat reflects active geothermal processes, with magma relatively close to the surface in this region. Native peoples used warm water resources throughout the Great Basin, and the spring's accessibility from a major highway has made it known to travelers for over a century.
Year-round visitation is possible, though winter brings heavy snow and harsh conditions that may close Route 395 temporarily. Spring through autumn offers the most accessible visiting windows. The water's extreme temperature demands careful respect and appropriate footwear. The spring's proximity to the highway makes it a compelling stop for long-distance Route 395 travelers.
Is this spring worth visiting?
Best for
- Hot spring soaking
- Easy day trips
- Overnight camping trips
Overview Big Cove Campground (5,700 feet) is located near the shores of Frenchman Lake in Northeastern California. Some families have been returning here for more than thirty years. Situated at the interface between the wild Sierra and the high desert, it's a perfect place to serve as hub for a wide range of recreation opportunities. Plumas National Forest has many back roads open for exploration. Take advantage of the beautiful blue waters of Frenchman Lake for boating, fishing and other wat...