Horse Creek Hot Springs

Lemhi County, Idaho · Near Salmon
45.5030°N, 114.4630°W · 6,080 ft
109°F 41°F air · Good soaking weather 6,080 ft Open Roadside US Forest Service Camping nearby (11.4 mi)
Aerial view of the ground around Horse Creek Hot Springs LiDAR bare-earth view of the same ground around Horse Creek Hot Springs
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.

Horse Creek Hot Springs sits in the Salmon National Forest, Lemhi County, thirty-some miles from the town of Salmon. The temperature is right in the range people look for, soaking warm, about what a hot bath feels like. Access is open according to our records. The water tested slightly acidic when it was sampled in 1980.

Location

You can see the road from the spring; the gap is about twenty yards. Its name did not make it into our records. The elevation is around six thousand feet, so winters bring real snow, nine or ten feet of it in an average year. Alta Campground, about eleven miles distant, is where our data puts the closest camping. The land is plain National Forest with no wilderness or other designation attached.

Midwinter rates best in our climate numbers, but that is a high-country road in winter and nothing in our record says it gets plowed. Roadside access means no walking to speak of. No fee is listed. Temperature comes from a 1980 USGS survey, so expect some drift from the figure in the table.

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 Horse Creek Hot Springs.

Setting
Canyon floor
Steep ground climbs away on both sides of the spring.
Highest ground nearby
441 ft above the spring
Within a quarter mile, to the south
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
84 milliwatts per square meter of heat flow

That's about 1½ times the US average of 65. It's higher than at 22% 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
20°
Jan
22°
Feb
29°
Mar
34°
Apr
43°
May
53°
Jun
64°
Jul
63°
Aug
54°
Sep
39°
Oct
26°
Nov
18°
Dec
Annual Precip: 25.3 in Annual Snow: 112.9 in
Best Time to Visit
December Air 18°F · Water 109°F · +91° contrast
January Air 20°F · Water 109°F · +89° contrast
February Air 22°F · Water 109°F · +87° contrast
December offers 46°F more contrast than July
Current Conditions
41°F
WSW 0.0 mph 90% Good soaking weather
Today 61° Low 38° Sunny
Spring is +48° warmer
Wednesday 66° Low 42° Sunny 1% precip
Spring is +43° warmer
Thursday 64° Low 43° Partly Sunny then Showers And Thunderstorms Likely 68% precip
Spring is +45° warmer
Friday 59° Low 40° Showers And Thunderstorms Likely 61% precip
Spring is +50° warmer
Saturday 63° Low 42° Sunny 10% precip
Spring is +46° warmer
Water Chemistry Sampled 1980-08-06

The water at Horse Creek Hot Springs is slightly acidic (pH 6.4).

pH 6.4 Slightly Acidic
pH influences mineral absorption through skin
Calcium 4 mg/L
May support bone density and joint health
Magnesium 1 mg/L
Known for muscle relaxation and stress relief
Sodium 3 mg/L
Supports circulation and skin hydration
Sulfate 4 mg/L
Traditionally used for skin conditions and inflammation
Chloride 0 mg/L
Natural antiseptic with skin health benefits
Where to Stay

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Nearby Camping
Alta Campground 11.4 mi away

Overview Alta Campground is located in a scenic forest in the heart of Montana's Bitterroot National Forest. The West Fork of the Bitterroot River flows nearby, giving visitors access to some of the best fishing the area has to offer, as well as other water-related recreation. Recreation Fly fishing and wading in the Bitterroot River, which runs alongside the campground, are popular activities. A variety of trails and unimproved roads are great for exploring by bike or off-road vehicle. Hiki...

Reservable Yes
Reserve on Recreation.gov →
Mile-High Advisory 6,080 ft

Horse Creek Hot Springs sits at 6,080 feet above sea level, way above the mile-high mark. You may not feel the altitude strongly, but hot water still dehydrates you faster at elevation. UV is about 24% stronger than at sea level, so bring sunscreen and drink more water than you normally would.

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Temperature
109°F
Warm Hot Boiling
Water Temp 109°F (43°C)
Avg Air Temp 39°F
Above Ambient +70°F
Great soaking conditions September
Access
Open
Road Access Roadside
Distance to Road 64 ft
Land
Ownership Federal
Agency US Forest Service
Designation National Forest
Unit Salmon National Forest
Manager US Forest Service
Protection 3 - Protected, subject to extractive use
Frequently Asked Questions
What is the water temperature at Horse Creek Hot Springs?
Horse Creek Hot Springs has a water temperature of 109°F (43°C). This is considered a hot spring, well above body temperature.
Where is Horse Creek Hot Springs located?
Horse Creek Hot Springs is located in Lemhi County, Idaho at 6,080 feet elevation, near Salmon. Coordinates: 45.5030°N, 114.4630°W.
How do I get to Horse Creek Hot Springs?
Horse Creek Hot Springs has Roadside road access (64 ft from the road).
Is Horse Creek Hot Springs free to visit?
Horse Creek Hot Springs has Open access. It is managed by US Forest Service.
Can I camp near Horse Creek Hot Springs?
Yes, Alta Campground is located nearby (11.4 miles away).
What minerals are in the water at Horse Creek Hot Springs?
Water chemistry analysis shows the presence of pH, Calcium, Magnesium, Sodium, Sulfate, Chloride. The pH is 6.4 (slightly acidic).
Sources: USGS NWIS