Gigantic Warm Spring

Gigantic Warm Spring lives up to its name as one of the largest-volume warm springs in Montana. The spring discharges enormous quantities of water at around 28°C — warm enough to be notable year-round — and its outflow contributes significantly to the upper Smith River system. The site is more of a natural spectacle than a developed soaking destination, attracting those interested in geothermal hydrology and the ecology of the spring-fed river corridor.