Deer Hot Springs

Also known as: Skinny Dipper's Hot Springs
Boise County, Idaho · Near Idaho City
44.0920°N, 116.0520°W · 3,120 ft
176°F 33°F air · Good soaking weather 3,120 ft Short Walk Camping nearby (6.5 mi)
Very Hot Source, Use Extreme Caution

At 176°F, the source water at Deer Hot Springs is hot enough to cause burns. Some hot springs this hot have cooler side pools or downstream areas suitable for soaking. Always test the water temperature before entering.

Aerial view of the ground around Deer Hot Springs LiDAR bare-earth view of the same ground around Deer 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.

Deer Hot Springs in Boise County comes out scalding at 176 degrees, well above anything skin can take. It sits near Banks Lowman Road some 21 miles out of Idaho City. OpenStreetMap calls it Skinny Dipper's Hot Springs, which suggests people do get in somewhere, though nothing on record explains how the water is cooled. Ownership goes unrecorded, and so does access. Swinging Bridge campground is six and a half miles away.

Location

From Banks Lowman Road it is a walk of about 360 feet. The elevation is low for the area, a little over three thousand feet, which does not stop the snow: around six and a half feet of it in a typical winter, in a moderately wet climate. There is no photo, and the terrain goes undescribed.

The listed best season is winter. Six feet of snow beside a named road is usually workable, but the road is still the thing to check. The water will scald; any soaking depends on cooling the record does not describe. The chemistry sample is from 1982. Ask about access before you go; it is not on record.

History of Deer Hot Springs

The spring carries a second name on OpenStreetMap, Skinny Dipper's Hot Springs. Nothing on record says which name is older or where the second one came from.

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 Deer Hot Springs.

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

A slice through the ground from west to east, about 0.6 miles end to end.

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

Heat Below
137 milliwatts per square meter of heat flow

That's about twice the US average of 65. It's higher than at 87% 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
39°
Mar
46°
Apr
55°
May
65°
Jun
75°
Jul
74°
Aug
64°
Sep
49°
Oct
37°
Nov
28°
Dec
Annual Precip: 28.7 in Annual Snow: 79.3 in
Best Time to Visit
January Air 28°F · Water 176°F · +148° contrast
December Air 28°F · Water 176°F · +148° contrast
February Air 32°F · Water 176°F · +144° contrast
January offers 47°F more contrast than July
Current Conditions
33°F
NW 0.0 mph 98% Good soaking weather
Today 74° Low 49° Sunny
Spring is +102° warmer
Wednesday 80° Low 54° Sunny
Spring is +96° warmer
Thursday 72° Low 50° Rain Showers Likely 69% precip
Spring is +104° warmer
Friday 73° Low 49° Slight Chance Rain Showers 18% precip
Spring is +103° warmer
Saturday 76° Low 50° Sunny 4% precip
Spring is +100° warmer
Water Chemistry Sampled 1982-07-21

The water at Deer Hot Springs is slightly alkaline (pH 8.2).

pH 8.2 Slightly Alkaline
pH influences mineral absorption through skin
Calcium 6 mg/L
May support bone density and joint health
Magnesium 0 mg/L
Known for muscle relaxation and stress relief
Sodium 120 mg/L
Supports circulation and skin hydration
Sulfate 88 mg/L
Traditionally used for skin conditions and inflammation
Chloride 39 mg/L
Natural antiseptic with skin health benefits
Where to Stay

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Nearby Camping
Swinging Bridge 6.5 mi away

Overview Swinging Bridge Campground is located 10 miles north of Banks, Idaho just off Highway 55 at an elevation of 4,000 feet. The North Fork Payette River flows next to the highway, where extreme kayaking is a popular activity.Recreation The North Fork of the Payette River is a very popular location for expert kayaking. Whitewater rafting is nearby on the Main and South Fork sections of the Payette River. Anglers will find good to excellent fishing for whitefish and rainbow trout.Facili...

Reservable Yes
Reserve on Recreation.gov →
Temperature
176°F
Warm Hot Boiling
Water Temp 176°F (80°C)
Avg Air Temp 49°F
Above Ambient +127°F
Great soaking conditions September
Access
Road Access Short Walk
Nearest Road Banks Lowman Road
Distance to Road 359 ft
Frequently Asked Questions
What is the water temperature at Deer Hot Springs?
Deer Hot Springs has a water temperature of 176°F (80°C). This is considered a hot spring, well above body temperature.
Where is Deer Hot Springs located?
Deer Hot Springs is located in Boise County, Idaho at 3,120 feet elevation, near Idaho City. Coordinates: 44.0920°N, 116.0520°W.
How do I get to Deer Hot Springs?
Deer Hot Springs has Short Walk road access, with the nearest road being Banks Lowman Road (359 ft from the road).
Can I camp near Deer Hot Springs?
Yes, Swinging Bridge is located nearby (6.5 miles away).
What minerals are in the water at Deer Hot Springs?
Water chemistry analysis shows the presence of pH, Calcium, Magnesium, Sodium, Sulfate, Chloride. The pH is 8.2 (slightly alkaline).
Is it safe to soak at Deer Hot Springs?
No, not at the source. The water at Deer Hot Springs reaches 176°F, which can cause severe burns within seconds. Look for cooled side pools or downstream stretches, and test with a hand before anything else.