Basin Creek Hot Spring surfaces at 133 degrees Fahrenheit directly along the Salmon River Scenic Byway in Custer County, just three meters from the pavement. At 6,060 feet elevation in the Challis National Forest, it combines serious geothermal heat with drive-up convenience, a rare pairing among Idaho's backcountry-oriented thermal features.
The spring steams beside the byway where Basin Creek meets the Salmon River corridor. Lodgepole pine and Douglas fir climb the slopes above, while willows and alder line the creek bottom. The Salmon River itself flows nearby, cold and clear, offering a stark temperature contrast. Annual snowfall exceeds 10 feet, and the surrounding peaks hold snow into July. The highly alkaline water, with a pH of 9.5 and dominant sodium chemistry, leaves a slick mineral film on the rocks around the source.
History of Basin Creek Hot Spring
Custer County sits at the heart of Idaho's thermal belt, where the Idaho Batholith's deep granitic rock stores and transmits geothermal energy along an extensive network of faults. Basin Creek Hot Spring's sodium-sulfate chemistry with minimal calcium indicates deep circulation through granite, dissolving silica and alkali minerals at temperatures well above what reaches the surface. The Salmon River Scenic Byway follows a route used by indigenous peoples and later by Lewis and Clark's expedition.
The spring sits virtually roadside on the Salmon River Scenic Byway, making it one of the easiest hot springs to reach in central Idaho. Water at 133 degrees Fahrenheit will burn skin, so do not enter the source. Pole Flat Campground lies 9 miles away with vault toilets and drinking water, first-come first-served. The byway is paved and generally accessible May through October. Winter travel requires checking road conditions with the Challis Ranger District.
Is Basin Creek Hot Spring worth visiting?
Best for
- Hot spring soaking
- Easy day trips
- Overnight camping trips
Basin Creek Hot Spring offers an accessible hot spring experience — great for a day trip.
Annual Precip: 24.4 in
Annual Snow: 126.2 in
December
Air 19°F · Water 133°F · +114° contrast
January
Air 22°F · Water 133°F · +111° contrast
February
Air 24°F · Water 133°F · +109° contrast
December offers 47°F more contrast than July
Recent Temperature
133.7°F
(56.5°C)
Measured Nov 02, 1983
The water at Basin Creek Hot Spring is alkaline (pH 9.5).
pH influences mineral absorption through skin
May support bone density and joint health
Supports circulation and skin hydration
Traditionally used for skin conditions and inflammation
Natural antiseptic with skin health benefits
This campground is away from the main road and up the hill overlooking the river and the dredge ponds. Campsites include picnic tables tent pads fire rings with cooking grills. Campground amenities include a vault toilet and drinking water. Sites accommodate trailers and motorhomes up to 32 feet long.
Reserve on Recreation.gov →
Swimsuit & towel
Water bottle
Stay hydrated, especially in hot water
Warm layers
Cold air before and after soaking
Camping gear
Nearby camping at Pole Flat Campground
Trash bag
Pack out what you pack in
Water shoes
Hot ground near source
USGS Quad: (EAST BASIN CREEK 7.5) · PP 492: 92.0 · NOAA: 15.0 · AMS Map: CHALLIS
What is the water temperature at Basin Creek Hot Spring?
Basin Creek Hot Spring has a water temperature of 133°F (56°C). This is considered a hot spring, well above body temperature.
Where is Basin Creek Hot Spring located?
Basin Creek Hot Spring is located in Custer County, Idaho at 6,060 feet elevation, near Challis. Coordinates: 44.2640°N, 114.8180°W.
How do I get to Basin Creek Hot Spring?
Basin Creek Hot Spring has Roadside road access, with the nearest road being Salmon River Scenic Byway (10 ft from the road).
Is Basin Creek Hot Spring free to visit?
Basin Creek Hot Spring has Open access. It is managed by US Forest Service.
Can I camp near Basin Creek Hot Spring?
Yes, Pole Flat Campground is located nearby (5.6 miles away).
What minerals are in the water at Basin Creek Hot Spring?
Water chemistry analysis shows the presence of pH, Calcium, Sodium, Sulfate, Chloride. The pH is 9.5 (alkaline).
Is it safe to soak at Basin Creek Hot Spring?
At 133°F, Basin Creek Hot Spring is hot enough to require caution. Enter slowly, limit soaking sessions to 15–20 minutes, and stay hydrated. Always tell someone your plans before visiting remote hot springs.
Is Basin Creek Hot Spring crowded?
Basin Creek Hot Spring is accessible from a paved road, making it easy to reach. Weekends and holidays may be busier — consider visiting on a weekday for a quieter experience.
What should I bring to Basin Creek Hot Spring?
Essentials for Basin Creek Hot Spring: swimsuit, towel, water bottle, warm layers for before and after soaking, camping gear, a trash bag to pack out what you pack in. The water is over 110°F — test the temperature before entering and watch for scalding near the source.