Salmon Falls Hot Spring
Salmon Falls Hot Spring pushes 153-degree water to the surface just six feet from North 1000 East road in Twin Falls County, one of the most roadside-accessible scalding springs in Idaho. Its sodium concentration of 130 mg/L is among the highest in the state's thermal inventory.
The spring sits at 2,900 feet in the arid Snake River Plain near Buhl, where annual rainfall barely hits 10 inches and snowfall averages just 14 inches. The landscape is flat, dry, and agricultural, a sharp contrast to Idaho's mountain hot springs. Sagebrush and irrigated fields frame the view. The water emerges clear and intensely hot, with zero magnesium and negligible calcium giving it an almost unnaturally smooth texture. Steam rises year-round but is most dramatic on cold winter mornings.
The extreme temperature, high sodium, and complete absence of magnesium point to circulation through the deep basaltic aquifer system beneath the Snake River Plain, one of the most thermally active volcanic provinces in North America. The 9.4 pH and 34 mg/L each of sulfate and chloride reflect prolonged water-rock interaction at depth. Salmon Falls Creek, the spring's namesake, historically supported salmon runs that gave the area its name.
This spring is dangerously hot at 153 degrees and sits essentially at the road edge. Do not enter the source water under any circumstances. There are no developed facilities or campgrounds nearby. Buhl, the nearest town, provides supplies and services. The flat, open terrain makes the spring easy to find but offers no shade. Winter access is straightforward given the low elevation and minimal snowfall.
Is Salmon Falls Hot Spring worth visiting?
Best for
- Observing powerful hot springs
- Easy day trips
Not ideal for
- Casual soaking
The water at Salmon Falls Hot Spring is alkaline (pH 9.4).