Dutch Frank Hot Spring

Boise County, Idaho · Near Idaho City
43.7890°N, 115.4340°W · 4,100 ft
149°F 33°F air · Good soaking weather 4,100 ft Open Roadside US Forest Service Camping nearby (5.6 mi)
Very Hot Source, Use Extreme Caution

At 149°F, the source water at Dutch Frank Hot Spring 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 Dutch Frank Hot Spring

The orange dot marks the spring, in a frame about three quarters of a mile wide.

Dutch Frank Hot Spring comes up alongside Middle Fork Road in the Boise forest, twenty miles from Idaho City. At the source the water runs near a hundred and fifty degrees. That is scalding. the record says open and the Forest Service holds the land, so permission is settled and heat is what you deal with.

Location

Under a hundred feet from the road. The elevation is about forty-one hundred feet. Ten feet of snow falls in a typical winter, and the rain is moderate. The nearest listed place to stay is Barber Flat Cabin, between five and six miles away. Nothing in the file covers the spring itself beyond the numbers.

Keep out of the source. At that heat water burns. The record puts the best months in winter. The pH figure, strongly alkaline, dates to a May 1981 sample. Park and you are there; access is open. Barber Flat Cabin for camping, if a cabin counts as camping for you.

Terrain

USGS hasn't flown a detailed laser scan here yet, so this view comes from aerial photos and older elevation data.

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

A slice through the ground from southwest to northeast, about 0.6 miles end to end.

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

Heat Below
134 milliwatts per square meter of heat flow

That's about twice the US average of 65. It's higher than at 84% 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
27°
Jan
30°
Feb
36°
Mar
41°
Apr
50°
May
62°
Jun
72°
Jul
72°
Aug
61°
Sep
47°
Oct
34°
Nov
25°
Dec
Annual Precip: 29.9 in Annual Snow: 121.1 in
Best Time to Visit
December Air 25°F · Water 149°F · +124° contrast
January Air 27°F · Water 149°F · +122° contrast
February Air 30°F · Water 149°F · +119° contrast
December offers 47°F more contrast than July
Current Conditions
33°F
SSE 0.0 mph 97% Good soaking weather
Today 72° Low 48° Sunny
Spring is +77° warmer
Wednesday 79° Low 53° Sunny 1% precip
Spring is +70° warmer
Thursday 70° Low 48° Showers And Thunderstorms 76% precip
Spring is +79° warmer
Friday 70° Low 47° Mostly Sunny then Slight Chance Rain Showers 23% precip
Spring is +79° warmer
Saturday 73° Low 49° Sunny 5% precip
Spring is +76° warmer
Water Chemistry Sampled 1981-05-28

The water at Dutch Frank Hot Spring is alkaline (pH 9.6).

pH 9.6 Alkaline
pH influences mineral absorption through skin
Calcium 2 mg/L
May support bone density and joint health
Magnesium 0 mg/L
Known for muscle relaxation and stress relief
Sodium 57 mg/L
Supports circulation and skin hydration
Sulfate 27 mg/L
Traditionally used for skin conditions and inflammation
Chloride 2 mg/L
Natural antiseptic with skin health benefits
Nearby Camping
Nearby Camping
Barber Flat Cabin (Boise National Forest, Id) 5.6 mi away

Overview The Barber Flat Cabin site was established for administrative use by the Forest Service in 1923, and was used prior to that by the Barber Lumber Company. At the time, the Forest Service used a cabin already on-site as a guard station and then built a new one in 1927. The current cabin and outbuildings were built by the Civilian Conservation Corps in 1935, and the cabin today looks much as it did back then. Guests can drive to Barber Flat Cabin in two-wheel drive passenger cars or tr...

Reservable Yes
Reserve on Recreation.gov →
Temperature
149°F
Warm Hot Boiling
Water Temp 149°F (65°C)
Avg Air Temp 47°F
Above Ambient +103°F
Great soaking conditions September
Access
Open
Road Access Roadside
Nearest Road Middle Fork Road
Distance to Road 88 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 Dutch Frank Hot Spring?
Dutch Frank Hot Spring has a water temperature of 149°F (65°C). This is considered a hot spring, well above body temperature.
Where is Dutch Frank Hot Spring located?
Dutch Frank Hot Spring is located in Boise County, Idaho at 4,100 feet elevation, near Idaho City. Coordinates: 43.7890°N, 115.4340°W.
How do I get to Dutch Frank Hot Spring?
Dutch Frank Hot Spring has Roadside road access, with the nearest road being Middle Fork Road (88 ft from the road).
Is Dutch Frank Hot Spring free to visit?
Dutch Frank Hot Spring has Open access. It is managed by US Forest Service.
Can I camp near Dutch Frank Hot Spring?
Yes, Barber Flat Cabin (Boise National Forest, Id) is located nearby (5.6 miles away).
What minerals are in the water at Dutch Frank Hot Spring?
Water chemistry analysis shows the presence of pH, Calcium, Magnesium, Sodium, Sulfate, Chloride. The pH is 9.6 (alkaline).
Is it safe to soak at Dutch Frank Hot Spring?
No, not at the source. The water at Dutch Frank Hot Spring reaches 149°F, which can cause severe burns within seconds. Look for cooled side pools or downstream stretches, and test with a hand before anything else.
Sources: USGS NWIS