Running Warm Springs
Running Warm Springs flows at 106 degrees in the Nezperce National Forest at 4,140 feet, carrying some of the most alkaline water in Idaho with a pH of 9.7. Its extremely low mineral content, just 1.6 mg/L calcium and 0.03 mg/L magnesium, produces remarkably soft thermal water.
The walk from Running Creek Road covers roughly half a mile through dense national forest in an area that receives nearly 36 inches of precipitation and over 12 feet of snow each year. The spring emerges in a drainage surrounded by conifers, where the sound of Running Creek mixes with birdsong and wind through the canopy. The water feels silky against skin due to its exceptional softness, and the forest canopy provides shade over much of the approach.
Located in what records list as Ravalli County but functionally within the Nezperce National Forest, this spring sits along a deep fault zone that allows meteoric water to circulate far underground before returning heated and stripped of nearly all dissolved minerals. The 9.7 pH and trace magnesium suggest prolonged contact with granitic rock at depth. Paradise Campground, 15 miles away on the Selway River, serves as the nearest developed facility.
Reaching the spring requires a half-mile walk from Running Creek Road. The temperature is comfortable for soaking without dilution. Snow closes access roads from roughly November through May, so summer and early fall are the reliable window. Paradise Campground on the Selway River, about 15 miles away, is first-come-first-served with 11 sites. Bring everything you need; this is remote country.
Is Running Warm Springs worth visiting?
Best for
- Hot spring soaking
- Overnight camping trips
The water at Running Warm Springs is alkaline (pH 9.7).
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Paradise Campground is located near the Paradise Boating Site which is one of the most popular launching sites on the Selway River. The campground consists of 11 sites complete with picnic tables, and fire rings. Other facilities include 3 vault toilets, hitching rails, and feed bunks. Campground can accommodate RV's or trailers to 25 feet.