Hot Spring Campground

Boise County, Idaho · Near Idaho City
44.0540°N, 115.9070°W · 3,120 ft
124°F 35°F air · Good soaking weather 3,120 ft Open Roadside US Forest Service Camping nearby (0.7 mi)

Hot Spring Campground is the name on record for a thermal source on Boise National Forest ground, sixteen miles from Idaho City, Boise County. Open to visitors, the record says. The water is hot, too hot for comfortable soaking as it comes out, and the flow the USGS logged is tiny, a bare trickle. A Forest Service campground called Hot Springs sits under a mile away.

Location

The source is a stone's throw from the road, well under two hundred feet, though the road itself is not named in the record. National Forest land at one of the lower elevations among Idaho's springs. Winters bring a good deal of snow, over six feet most winters, and the year as a whole is fairly wet.

Winter is the season on record here, December into February. Camping is about as convenient as it gets, with the Hot Springs campground less than a mile off. Hot enough to hurt, this one, so go in by degrees and check it with a hand before anything else. The recorded flow is very small, so do not expect much volume. Chemistry was last sampled in 1978.

Terrain

Aircraft with laser scanners measured this ground to within inches. The scan strips out trees and buildings, leaving the bare shape of the land around Hot Spring Campground.

Aerial view of the ground around Hot Spring Campground LiDAR bare-earth view of the same ground around Hot Spring Campground
Aerial LiDAR bare earth

Drag the handle to compare the two views. The orange dot marks the spring, in a frame about three quarters of a mile wide.

Setting
Canyon floor
Steep ground climbs away on both sides of the spring.
Highest ground nearby
517 ft above the spring
Within a quarter mile, to the northeast
Cross-section through the spring

A slice through the ground from south to north, about 0.6 miles end to end.

Elevation data: USGS 3D Elevation Program. Aerial imagery: USGS The National Map. Public domain.

Heat Below
132 milliwatts per square meter of heat flow

That's about twice the US average of 65. It's higher than at 83% of the springs on this site.

Heat flow measures the warmth working its way up through the ground from deep inside the earth. Where it runs high, rain and snowmelt that seep down through cracks in the rock come back up hot.

Heat flow estimate: Stanford Thermal Earth Model (Aljubran & Horne, 2024), CC BY 4.0.

Monthly Climate
28°
Jan
32°
Feb
38°
Mar
45°
Apr
54°
May
64°
Jun
75°
Jul
74°
Aug
63°
Sep
49°
Oct
36°
Nov
27°
Dec
Annual Precip: 28.4 in Annual Snow: 79.9 in
Best Time to Visit
December Air 27°F · Water 124°F · +97° contrast
January Air 28°F · Water 124°F · +96° contrast
February Air 32°F · Water 124°F · +92° contrast
December offers 47°F more contrast than August
Current Conditions
35°F
S 0.0 mph 93% Good soaking weather
Today 77° Low 42° Sunny
Spring is +47° warmer
Wednesday 84° Low 46° Sunny
Spring is +40° warmer
Thursday 76° Low 43° Rain Showers Likely 72% precip
Spring is +48° warmer
Friday 76° Low 42° Areas Of Fog 19% precip
Spring is +48° warmer
Saturday 79° Low 44° Sunny 5% precip
Spring is +45° warmer
Water Chemistry Sampled 1978-11-23

The water at Hot Spring Campground is alkaline (pH 9.0).

pH 9.0 Alkaline
pH influences mineral absorption through skin
Calcium 3 mg/L
May support bone density and joint health
Magnesium 0 mg/L
Known for muscle relaxation and stress relief
Sodium 77 mg/L
Supports circulation and skin hydration
Sulfate 37 mg/L
Traditionally used for skin conditions and inflammation
Chloride 7 mg/L
Natural antiseptic with skin health benefits
Where to Stay

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Nearby Camping
Hot Springs 0.7 mi away

Overview Hot Springs Campground is located just east of Garden Valley, Idaho along the Banks-Lowman Highway at an elevation of 3169 feet. Visitors enjoy rafting, kayaking, fishing on the South Fork Payette River, and soaking in the hot springs at the river's edge. Recreation The South Fork Payette River is across the road from the campground, offering fishing, whitewater rafting, and kayaking. A natural hot springs soaking pool is located on the river directly across the road and down a...

Reservable Yes
Reserve on Recreation.gov →
Temperature
124°F
Warm Hot Boiling
Water Temp 124°F (51°C)
Avg Air Temp 49°F
Above Ambient +75°F
Great soaking conditions September
Access
Open
Road Access Roadside
Distance to Road 140 ft
Land
Ownership Federal
Agency US Forest Service
Designation National Forest
Unit Boise National Forest
Manager US Forest Service
Protection 3 - Protected, subject to extractive use
Frequently Asked Questions
What is the water temperature at Hot Spring Campground?
Hot Spring Campground has a water temperature of 124°F (51°C). This is considered a hot spring, well above body temperature.
Where is Hot Spring Campground located?
Hot Spring Campground is located in Boise County, Idaho at 3,120 feet elevation, near Idaho City. Coordinates: 44.0540°N, 115.9070°W.
How do I get to Hot Spring Campground?
Hot Spring Campground has Roadside road access (140 ft from the road).
Is Hot Spring Campground free to visit?
Hot Spring Campground has Open access. It is managed by US Forest Service.
Can I camp near Hot Spring Campground?
Yes, Hot Springs is located nearby (0.7 miles away).
What minerals are in the water at Hot Spring Campground?
Water chemistry analysis shows the presence of pH, Calcium, Magnesium, Sodium, Sulfate, Chloride. The pH is 9.0 (alkaline).
Is it safe to soak at Hot Spring Campground?
With care. At 124°F Hot Spring Campground is hot enough to need short sessions, fifteen to twenty minutes, and plenty of water. Enter slowly and get out if you feel light-headed.