Bonneville Hot Springs
- Free
- 2 hr 33 min from Boise
- 0.25 mi hike
A hot springs soaking pool a quarter mile by trail from the Forest Service's Bonneville Campground at milepost 91.5 on Highway 21, northeast of Lowman. The campground season runs end of May to end of September, after which it is open to dispersed camping until snow. The Warm Springs Guard Station rental cabin also has a trail to the springs, used on skis and snowshoes in winter.
As of Oct 2026 the water pump is locked and there is no toilet or trash service
- Price
- Free
- Nearest town
- Lowman
- From Boise
- 2 hr 33 min
- Hike (one way)
- 0.25 mi
Plan your visit
Hours & season
| Season |
|
|---|
Tickets & booking
| Price |
|
|---|---|
| Access | Free public access |
On site
| Lodging | No |
|---|---|
| Camping nearby | Yes |
| Land manager | USFS |
Not stated by the land manager: swimwear, ages, dogs.
Soak responsibly
- Pack out everything, including food scraps and toilet paper. Use WAG bags where required.
- No soap, shampoo or sunscreen in the pools; rinse away from the water.
- Check permits and closures with USFS before you go.
- Keep groups small and give others space. Respect posted dog and camping rules.
Water temperature
This venue doesn't publish pool temperatures.
Mineral profile
Total dissolved minerals
301 mg/L
Lightly mineralized · Sodium–sulfate (sodium sulfate water)
- pH
- 9.3
- Temp at source
- 185°F
- Lithium
- 0.11 mg/L
- Fluoride
- 17 mg/L
- Boron
- 0.07 mg/L
Lab analysis of the source water at “10n 10e 31bcc1s Bonneville H.S.”, sampled 1972–1992 by the USGS and partners (data). Pool water may be cooled, mixed or treated, and spring chemistry is generally stable over decades. We report measurements only; we don't make health claims.
What's here
- 1/4-mile trail from Bonneville Campground
- soaking pool
- 22-site FS campground
- winter ski or snowshoe access from Warm Springs Guard Station
Getting there
- From Boise2 hr 33 min95 mi
- From Stanley51 min40 mi
- From Boise (BOI)2 hr 34 min91 mi
Typical driving time without traffic or snow, to the closest road point; add the hike.
| Elevation | 4,759 ft |
|---|---|
| Road |
|
| Hike | 0.25 mi one way |
| Trail | 1/4-mile trail from Bonneville Campground |
| Parking | FS lists a $5/vehicle day-use fee for non-campers in season |
Things to do near Lowman
Kirkham Hot Springs
Forest Service day-use hot springs on the South Fork Payette east of Lowman; $5 per vehicle
Grandjean Trailhead and Campground
Trailhead into the Sawtooth Wilderness and a first-come campground at the end of Grandjean Road
Campgrounds
Trailheads
Straight-line distances. Campground and trailhead data © OpenStreetMap contributors.
Nearby springs
Sacajawea Hot Springs
Primitive hot springs pools on the South Fork Payette River along Grandjean Road, just west of Grandjean and the Sawtooth Lodge. The Stanley-Sawtooth Chamber lists it among the springs west of Stanley on Highway 21.
Sawtooth Lodge
A rustic lodge at Grandjean, founded as a hunting lodge in 1927 and run under a Forest Service special use permit, with a hot springs-fed pool. Cabin and yurt stays include pool access, and the restaurant serves breakfast, lunch and dinner with beer and wine.
Haven Hot Springs
A roadside stop on Highway 21 near Kirkham with a 1951 pool, about 75 by 30 feet, fed by flowing thermal water and hotter on one side (101-104°F) than the other (85-98°F). The pool is booked as a private soak by the hour, and each of the four motel rooms has its own soaking tub. RV and tent sites are on site.
Sacajawea Hot Springs: 7 mi · Sawtooth Lodge: 7 mi · Haven Hot Springs: 13 mi
Sources (3)
· checked November 2026
Prices, hours and rules are checked against the official site and land-agency pages. Spot something out of date? Let us know.