Unnamed Thermal Spring
This impressive 109-degree thermal spring near Alturas flows at 4,504 feet elevation just meters from Surprise Valley Road, creating 58 degrees of warmth in one of the region's coldest environments.
The spring emerges from the earth near the road in the high Modoc plateau, with aspen, fir, and pine forest surrounding the site. The landscape receives 61 inches of annual snowfall—among California's heaviest—creating seasonal conditions where the thermal water provides welcome warmth during long winters.
The spring's 58-degree temperature elevation above ambient indicates strong geothermal circulation in the Modoc region. Patterson Guard Station, established in 1921 as a fire lookout post, stands nearby and now offers facilities for visitors exploring the South Warner Wilderness boundary.
Roadside access from Surprise Valley Road provides easy reach to this exceptional spring. Winter snowfall exceeds 61 inches annually, making access challenging from November through April. Summer and early fall offer optimal visiting conditions, with Patterson Guard Station offering nearby camping facilities 11.3 kilometers away.
Is this spring worth visiting?
Best for
- Hot spring soaking
- Easy day trips
- Overnight camping trips
Overview *Altitude is 7,080 feet above sea level* Set on the edge of a meadow surrounded by Aspen, Fir and Pine trees, Patterson Guard Station has stood since 1921. It served the Modoc National Forest as a fully staffed fire office and guard station until 1981. Just a few footsteps from the Summit Trail and one-quarter mile from the wilderness boundary, Patterson Guard Station can be your basecamp for trips into the South Warner Wilderness or the perfect place to disconnect and relax. The...