Cronks Canyon Hot Springs combines rugged, natural scenery with simple geothermal soaking. It’s peaceful, undeveloped, and easy to reach off Highway US‑93, north of Challis near Ellis.

This riverside hot spring lies about 20 miles north of Challis, roughly a 25–30 minute drive. At 4,700 feet elevation, mornings and evenings can feel crisp even in late summer and fall.

You’re surrounded by steep rock walls, sagebrush-covered hills, and the steady murmur of the Salmon River. The pools sit below the highway embankment, hidden from view, offering a quick, secluded soak with classic canyon vistas.

At night, canyon walls frame a brilliant sky. On clear late-summer evenings, the Milky Way appears in vivid detail. Bring a light jacket—temperatures can dip into the 40s–50s°F by September.

Cronks Canyon Hot Springs Mineral Pools & Soaking

The pools at Cronks Canyon are small, rock-lined basins filled with clear, mineral-rich water. The geothermal source emerges hot, near 110–115°F (43–46°C), then cools as it mixes. By September, the main pool often settles around 100°F (38°C). Because the pools are small (about seven by 10 feet), they can heat up quickly, especially on hot afternoons. Many visitors test the water first, then blend it with river water using a small bucket.

There are two pools: one above the river near cement blocks and another at the river’s edge. In spring, the lower pool can be underwater, but by late summer both are usually usable. The water is smooth and relaxing, with only a faint mineral smell. Swimwear is advised when standing, since the highway is nearby.

Some visitors treat the pools as clothing optional, so keep a suit handy.

Access requires a short scramble down a steep, loose bank. Sturdy shoes are highly recommended, especially when rocks are wet.

This stretch of the Salmon River corridor is full of scenic roadside views, quick stops, and mineral water hot springs. Along US‑93, you’ll find canyon overlooks, fishing pullouts, and short riverbank walks.

While Cronks Canyon is a highlight, the corridor offers plenty more to explore. About 29 miles south, you can soak at Challis Hot Springs, or venture to other wild hot springs between Challis and Stanley, such as Sunbeam and Boat Box Hot Springs. Many are primitive and tucked into the river canyon, offering secluded spots for soaking.

The area is also a great destination for rockhounds. Look for agate, jasper, opal, and other mineral treasures along the river’s gravel bars and surrounding hills.

Location: 20 miles north of Challis • Idaho • USA
Best time: Summer and fall
Development: Undeveloped
Clothing: Recommended
Amenities: None

Hiking distance: ~250–400 yards total walking; final 40–60 feet is a steep, rocky scramble
Road access: Any vehicle; two small pullouts between mileposts 266 and 267
Day-use fees: None
Managed by: Bureau of Land Management (BLM)

Elevation: 4.600 ft (1,400 m)

Water T° (source): 110–115°F (43–46°C)
Water T° (pools): 98–104°F (37–40°C) typical; about 100°F (38°C) in September
Odor: Very light sulfur scent

From Challis,

Travel north on US‑93 for about 18 miles to Ellis (a small riverside settlement)
Continue 2.4 miles past Ellis toward mileposts 266–267. Aim for around mile 266.6–266.7.

Look for two small pullouts along the west side of the highway in this stretch. They can hold one–two cars each and are easy to miss.

Park safely, and then walk back along the riverbank toward Challis (south) for about 150 feet. The upper pool is hidden below the road embankment.

GPS: N 44°43.137' W 114°00.967'| 44.719, -114.016