San Francisco Hot Springs
San Francisco Hot Springs surfaces at 120°F (35°C per USGS) along the San Francisco River in Greenlee County at 4,640 feet. The water is high in chloride (310 mg/L) and sodium (200 mg/L) with a neutral pH of 7.3. Roadside access places the spring just 53 meters from the road, though terrain may require scrambling.
The spring emerges along the steep-walled San Francisco River canyon near the New Mexico–Arizona border. At 4,640 feet, the canyon supports riparian cottonwood and willow along the river, while surrounding hillsides carry Sonoran-to-transition-zone vegetation including juniper and scrub oak. Annual rainfall averages 14 inches with about 11 inches of snow. The river canyon cuts deeply into volcanic and sedimentary rock, and the Gila Wilderness sprawls to the northeast across the state line.
Flash flood risk is serious in this canyon; do not visit during monsoon season (July through September) or when storms are forecast. The 120°F source water is dangerously hot — downstream pools where river water mixes create soakable temperatures. Check locally in Clifton for current trail and road conditions, as access routes change after floods. Carry adequate water and sun protection. No developed campgrounds exist nearby; the closest reservable option is over 35 km away.
San Francisco Hot Springs takes its name from the San Francisco River. The thermal features along this canyon have been used informally by bathers for decades. Flash flooding periodically reshapes the pools and access trails — major floods have repeatedly destroyed and rebuilt the soaking areas. The spring lies in a remote stretch of canyon accessed primarily from the Arizona side via Clifton, despite its New Mexico county designation.
The water at San Francisco Hot Springs is slightly alkaline (pH 7.3). It is notably rich in chloride (natural antiseptic with skin health benefits).
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San Francisco Hot Springs is road-accessible, so you can bring more gear. The water runs hot, so extra hydration is key.
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