Chattanooga Hot Springs

What to expect

Chattanooga Hot Springs is the kind of place people talk about after a road trip. Hot mineral water spills out of a hillside above the Middle Fork of the Boise River and runs about 100 feet down a rock face, steaming as it goes. At the bottom, volunteers have built a rock and sand wall that holds one large pool. You sit with the hot water falling in at one end and the river sliding past a few feet away.

The pool is big enough for a group and deep enough to soak up to your neck. It is hottest right under the falling water and cools off toward the far wall, so you pick a spot that suits you. Reports put the pool at about 100-110°F38-43°C, and one visitor measured 102°F39°C in mid-September. The water is clear, and the pool has a gravel and sand bottom.

It is fully undeveloped. There are no toilets, changing areas, trash cans or drinking water at the springs. Expect to share the pool on summer weekends, because Atlanta draws a steady stream of soakers, campers and off-road riders. Bring a swimsuit: a Boise National Forest order bans public nudity here through August 2030.

Atlanta itself is worth the trip. It was a gold and silver camp in the 1860s and still has old cabins, mining relics and a small year-round population at the edge of the Sawtooth Wilderness.

Getting there

Atlanta is remote. Every route in is a long gravel or dirt drive, and the roads are rough, washboarded and prone to washouts. Fuel up before you leave the pavement. There are no gas stations close by.

The two common approaches from Boise:

• Via the Middle Fork Boise River Road. From Boise, head east past Lucky Peak and Arrowrock reservoirs and follow the Middle Fork Boise River Road upstream all the way to Atlanta. It is the most direct line on a map, but it is slow, dusty and washboarded for long stretches.
• Via Highway 21. Drive Highway 21 north past Idaho City, then take one of the Forest Service roads that cross over to the Middle Fork Boise River Road. In summer this is often the faster option because more of the drive is paved.

Get current road conditions from the Boise National Forest before you go, especially early or late in the season.

From Atlanta, drive about 1.2 miles east on the Middle Fork Boise River Road (Main Street becomes the road as you leave town). Just before the pond at Atlanta Hot Springs, turn left onto a short spur and follow it about 0.2 miles to the end. From there, a steep path drops roughly 100 feet down the cliff to the pool.

The path is short but loose, and it turns slick after rain. Wear shoes with grip.

A note on parking: the flat bench above the springs is partly private land, and it has been posted “No Trespassing” in the past. Park only where it is clearly public, follow any signs, and do not camp up there.

When to go

Late summer and early fall are the reliable months. By then the Middle Fork has dropped, the pool is clear of the river, and the roads are dry. Late August through September is the sweet spot, and weekdays are much quieter than weekends.

Late spring and early summer are a gamble. Snowmelt raises the river, and during runoff the pool can be partly or fully under water.

Winter is for experienced backcountry travellers only. The Middle Fork Boise River Road is not plowed and is usually closed or impassable from about November to May. Most people who reach Atlanta in winter do it by snowmobile, and only with avalanche knowledge.

Summer brings mosquitoes and biting bugs, and one visitor reported mites around the pool in September. Bring repellent.

Rules and etiquette

The springs are on Boise National Forest land, with private land close by. There is no fee and no posted hours.

• No soap or shampoo in the pool, including biodegradable products. Fines can apply.
• Respect private land. Stay off posted property above the springs.
• Pack out everything, including bottles, cans and toilet paper. There are no facilities.
• No glass. The pool bottom is gravel, and broken glass is impossible to find.
• Swimsuits are required. A Boise National Forest order prohibits public nudity on all national forest land in the forest from August 27, 2025, through August 27, 2030. Older reports describe this pool as clothing optional, but that no longer applies.
• No camping at the pool or on the cliff above it.
• Share the space. On busy days, rotate through the hot spot under the falls.

Where to stay nearby

There is no camping at the springs, but there are good options within a few minutes’ drive:

• Power Plant Campground (Boise National Forest): Just up the river near the Power Plant Recreation Area, with about two dozen sites, picnic tables, fire rings and a vault toilet. It is usually open from about May to September and is first come, first served. Check whether drinking water is on before you count on it.
• Riverside Campground: Another Forest Service campground along the Middle Fork Boise River near Atlanta.
• Dispersed camping: Some pullouts and side roads along the Middle Fork Boise River Road allow it. Follow posted rules and fire restrictions.
• Atlanta Cabin: A Forest Service rental in the 1933 ranger station compound in Atlanta, listed on the National Register of Historic Places. It sleeps four and has a kitchen, bathroom and heat. It is not booked through Recreation.gov, so call the Boise National Forest at (208) 392-3700 for details.

Atlanta has very few services. Beaver Creek Lodge in town serves meals, but plan to bring most of what you need.

Safety notes

• Heat: The water falling off the cliff is hotter than the pool, roughly 120°F49°C by one estimate. Do not stand under the inflow for long, and test the water with your hand first.
• The path: The steep, loose climb back up the cliff is the main hazard, especially at dusk or in the rain. Carry a headlamp.
• The river: The Middle Fork runs fast and cold during runoff. Do not wade out from the pool in early summer.
• Remoteness: Cell coverage is patchy, and emergency help is a long way off. Tell someone your route, carry a spare tire, and bring extra water and food.
• Wildlife: Elk, deer and eagles are common around Atlanta. Store food properly at camp.

Nearby stops worth adding

Atlanta has two more springs within a short drive. Atlanta Hot Springs, at the pond just before the Chattanooga turnoff, is a smaller, quieter soak. The Power Plant Recreation Area has hot water near the campground. Many visitors spend a day hopping between all three.

For a hike, the Powerplant Trail and the Middle Fork Boise River Trail leave from near Atlanta and head into the Sawtooth Wilderness, with Greylock Mountain (9,363 feet) looming over town. In town, walk past the old cabins and the 1860s schoolhouse for a sense of how this camp looked in its mining days.