Big Smokey Hot Spring
Big Smokey Hot Spring hides deep in the Sawtooth National Forest, nearly 4.2 miles from the nearest road. Its temperature is recorded simply as 'H' for hot, meaning no precise measurement exists in the historical record. Reaching it requires a genuine backcountry trek through one of central Idaho's snowiest drainages, where annual snowfall averages 150 inches.
The hike follows Big Smoky Creek upstream through a narrow, timbered valley in Camas County. Douglas fir and lodgepole pine crowd the drainage, and the creek runs cold and clear over cobble. At 6,320 feet elevation, the air carries a bite even in summer. When the hot spring finally appears, steam rising off the water contrasts sharply with the cool, shaded forest floor. The surrounding terrain is steep and roadless, with few signs of human presence.
Plan for a full-day outing or an overnight trip. The 4.2-mile approach from Baker Creek Road has no maintained trail for portions of the route. Bowns Campground, 16 miles away near Big Smoky Creek, offers 10 first-come, first-served sites. Check conditions with the Sawtooth National Forest ranger district before heading out, as snow lingers well into June at this elevation.
Big Smoky Creek cuts through the southern edge of the Idaho Batholith, a massive granitic intrusion that hosts dozens of thermal features across central Idaho. Deep fractures in this plutonic rock allow snowmelt and rainwater to descend thousands of feet, absorb geothermal heat, and return to the surface along fault zones. The Sawtooth region's volcanic and tectonic history makes it one of the most thermally active areas in the American West.
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Bowns Campground, located 25 miles east of Featherville and 18 miles north of Fairfield, is a developed campground composed of 10 units along Big Smoky Creek. Two of the camp sites are double family units. Camping, fishing, hiking, and picnicking are popular activities. Campground amenities include picnic tables, fire rings, drinking water (seasonally) and restrooms. Miller Creek Trail (#087) starts just south of the campground and is open to motorcycles.
Big Smokey Hot Spring sits at 6,320 feet above sea level, way above the mile-high mark. You may not feel the altitude strongly, but hot water still dehydrates you faster at elevation. UV is about 25% stronger than at sea level, so bring sunscreen and drink more water than you normally would.
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Big Smokey Hot Spring is road-accessible, so you can bring more gear. Cold air temperatures make a changing robe or warm layers essential.
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