Sheep Creek Bridge Hot Spring

What to expect

Sheep Creek Bridge Hot Spring is one of the smaller stops in the long chain of hot springs on the Middle Fork Boise River. Hot water seeps out of the hillside near the point where the Middle Fork Boise River Road crosses the river at the Sheep Creek bridge, runs downhill through a source pool coated in orange algae, and collects in shallow pools near the water.

Set your expectations low. The pools are small and shallow, walled with rocks and sometimes dammed with tarps, with dirt, sand and rock bottoms. Light algae grows in all of them. The source is very hot, reported at about 142°F61°C, and it cools as it runs down the slope, so one spot can be scalding while the next is barely warm. A soaking pool just below the source has been measured at around 98°F37°C, but that number is only a snapshot.

Condition is the big variable. Visitor reports going back to 2003 swing from a decent soak with a river view to a set of muddy, silty puddles after someone pulled the walls apart. One 2009 report says the owners of nearby Twin Springs used to look after the pool until vandalism and trash wore them down. If you arrive and find a ruin, you can rebuild a wall or two, or just drive on to the next spring.

What it has going for it is the setting: a forested canyon, the river right there, and very little traffic outside summer weekends. The pools are visible from the road, so this is not a private soak. There are no facilities at all.

Getting there

The spring is on the Middle Fork Boise River Road (Forest Road 268), the long gravel road that runs from Arrowrock Reservoir up the Middle Fork to the old mining town of Atlanta.

• From Boise: Drive east on Highway 21 past Lucky Peak toward Idaho City. Turn off for Arrowrock Reservoir onto the Middle Fork Boise River Road at the Mores Creek bridge area, and follow it past Arrowrock Dam and along the reservoir. Keep going upriver for roughly 30 miles from the turnoff to the Sheep Creek bridge. If you reach Troutdale Campground, which the Forest Service puts about 33 miles up FS 268, you have gone about 2 miles too far.
• From Atlanta: Come down FR 268 the other way. Hot spring directories put the bridge about 37 miles from Atlanta.

Park off the road near the bridge and follow the short path to the pools. It is a walk of a few minutes, close to 70 yards by one estimate. Plan on slow driving the whole way. The road is narrow, washboarded and dusty, with blind corners and summer truck traffic. A high-clearance vehicle is more comfortable but not essential in dry weather.

When to go

Late summer through fall is the realistic window. In spring and early summer the Middle Fork runs high and the riverside pools are often damaged or underwater. As the river drops, people start rebuilding the walls.

September and October are the best months. The road is dry, the campgrounds empty out, and a cool morning makes the warm water more welcome.

Winter is possible but hard. The Middle Fork Boise River Road is described as the year-round route into Atlanta, but it is rough and snowy, and other approach roads close for the season. It is not a casual winter outing.

Current conditions: When this page was checked in October 2026, the Boise National Forest had no alert covering FR 268 near Sheep Creek. The Crooked Fire closure that autumn covered roads and trails to the north near Idaho City, not the Middle Fork road. Check the Boise National Forest alerts page before you go, especially after summer storms, which have washed out sections of this road before.

Rules and etiquette

• Swimsuits required. A Boise National Forest order bans public nudity on all national forest land in the Boise from August 27, 2025, through August 27, 2030. The pools are also in plain sight of the road.
• No soap or shampoo, including biodegradable kinds. The pools are tiny and the river is right below.
• Do not dig or reroute the source. Small repairs to pool walls are part of the culture here. Tearing pools apart is why this spring is often in bad shape.
• Pack out everything. There are no trash cans. Take tarps, cans and anything else you find in the pools with you.
• Park off the road. FR 268 is narrow and trucks need room to pass.
• Camp in legal sites. Boise National Forest limits camping to 14 days in any 30-day period.

Where to stay nearby

• Troutdale Campground is about 2 miles upriver on FR 268. The Forest Service lists it as free, open from about the end of May to the end of September, with fire rings, picnic tables and a vault toilet. There is no drinking water, so bring your own.
• Other Middle Fork campgrounds line FR 268 between Arrowrock and Atlanta, along with plenty of dispersed sites. Many fill on summer weekends.
• Twin Springs, a few miles downriver, is a private resort with rustic cabins. Check its current status before counting on it.
• Idaho City is the nearest town with motels, food and fuel, back on Highway 21.

Safety notes

• Scalding source. The water leaving the hillside is around 142°F61°C, hot enough to burn. Keep children and dogs away from the source and the runoff channel, and test every pool by hand.
• Water quality. The pools are shallow, silty and algae-lined, and the water sits still in hot weather. Keep your head out of it and skip the soak with open cuts.
• River crossings and currents. In high water the Middle Fork is cold and fast. Do not wade out from the pools in spring.
• The road. Blind corners and oncoming trucks are the main hazard on FR 268. Drive slowly, stay right and keep your headlights on.
• No signal. There is no reliable cell service on the Middle Fork road. Tell someone your plan and carry water, a spare tire and food.

Nearby stops worth adding

Sheep Creek Bridge works best as one stop on a Middle Fork Boise hot springs run. Upriver you reach Smith Cabin Hot Spring, Dutch Frank Hot Spring and Granite Creek Hot Spring, all close to the road. At the top of the valley, Chattanooga Hot Springs sits near the town of Atlanta. Loftus Hot Spring is another soak on the same road.