Forge Creek Hot Springs

Custer County, Idaho · Near Challis
44.8960°N, 114.5630°W · 5,920 ft
Hot 34°F air · Good soaking weather 5,920 ft Open Hike US Forest Service Camping nearby (7.9 mi)
Aerial view of the ground around Forge Creek Hot Springs LiDAR bare-earth view of the same ground around Forge 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.

Forge Creek Hot Springs is backcountry water in the Salmon National Forest, Custer County, over thirty miles from Challis and three and a half miles of walking past the last road. The survey calls it hot and gives no temperature. Access is open. That is a thin record for a place this far in, and it should shape how you think about going.

Location

Nearly six thousand feet. The hike is three and a half miles or so from an unnamed road, and the winter snow is about eight and a half feet, with a fairly dry year otherwise. Yellowjacket Guard Station is the closest lodging in the record, eight miles off. The file has nothing on the route.

Nothing is rated as a best season. The temperature is unknown; the only reading is an August 1979 chemistry sample that calls the water alkaline. Do not plan on soaking from this page alone. Yellowjacket Guard Station for lodging, hiking in required.

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 Forge Creek Hot Springs.

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

A slice through the ground from northwest to southeast, about 0.6 miles end to end.

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

Heat Below
98 milliwatts per square meter of heat flow

That's about 1½ times the US average of 65. It's higher than at 44% 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
21°
Jan
23°
Feb
30°
Mar
35°
Apr
44°
May
55°
Jun
66°
Jul
65°
Aug
55°
Sep
41°
Oct
27°
Nov
18°
Dec
Annual Precip: 23.4 in Annual Snow: 103.0 in
Current Conditions
34°F
Clear N 0.0 mph 86% Good soaking weather
Today 61° Low 40° Sunny
Wednesday 66° Low 45° Sunny
Thursday 62° Low 44° Rain then Showers And Thunderstorms 78% precip
Friday 57° Low 40° Chance Light Rain then Chance Showers And Thunderstorms 54% precip
Saturday 62° Low 42° Sunny 10% precip
Water Chemistry Sampled 1979-08-01

The water at Forge Creek Hot Springs is alkaline (pH 8.7).

pH 8.7 Alkaline
pH influences mineral absorption through skin
Calcium 5 mg/L
May support bone density and joint health
Sodium 67 mg/L
Supports circulation and skin hydration
Sulfate 36 mg/L
Traditionally used for skin conditions and inflammation
Chloride 9 mg/L
Natural antiseptic with skin health benefits
Nearby Camping
Nearby Camping
Yellowjacket Guard Station 7.9 mi away

Overview Yellowjacket Guard Station is a historic Forest Service Ranger Station and Work Center. Originally constructed in 1925 and remodeled in 1934 by the Civilian Conservation Corps, the structure is eligible for listing on the National Register of Historic Places. Recreation Hikers, horseback riders, mountain bikers and off-road enthusiasts will find many trails in the surrounding area. Hunting is also a popular activity. Click here for an Idaho OHV safety messageFacilities The spacious...

Reservable Yes
Reserve on Recreation.gov →
Mile-High Advisory 5,920 ft

Forge Creek Hot Springs sits at 5,920 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
Hot
Warm Hot Boiling
Avg Air Temp 40°F
Access
Open
Road Access Hike
Distance to Road 3.6 mi
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 Forge Creek Hot Springs?
Forge Creek Hot Springs is classified as hot. An exact temperature measurement has not been recorded.
Where is Forge Creek Hot Springs located?
Forge Creek Hot Springs is located in Custer County, Idaho at 5,920 feet elevation, near Challis. Coordinates: 44.8960°N, 114.5630°W.
How do I get to Forge Creek Hot Springs?
Forge Creek Hot Springs has Hike road access (3.6 mi from the road).
Is Forge Creek Hot Springs free to visit?
Forge Creek Hot Springs has Open access. It is managed by US Forest Service.
Can I camp near Forge Creek Hot Springs?
Yes, Yellowjacket Guard Station is located nearby (7.9 miles away).
What minerals are in the water at Forge Creek Hot Springs?
Water chemistry analysis shows the presence of pH, Calcium, Sodium, Sulfate, Chloride. The pH is 8.7 (alkaline).
Sources: USGS NWIS