Sheep Creek Bridge Hot Spring

Also known as: Sheep Creek Bridge Hot Springs
Boise County, Idaho · Near Idaho City
43.6960°N, 115.6580°W · 3,540 ft
142°F 33°F air · Good soaking weather 3,540 ft Open Roadside US Forest Service Camping nearby (6.1 mi)
Very Hot Source, Use Extreme Caution

At 142°F, the source water at Sheep Creek Bridge 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.

Sheep Creek Bridge Hot Spring comes up beside Middle Fork Road inside Boise National Forest, Boise County, a dozen or so miles from Idaho City. The water is scalding at the source, over 140 degrees on the 1981 reading. Open access. OpenStreetMap calls it Sheep Creek Bridge Hot Springs, plural. A photo is on file. Idaho City is the closest town the record names.

Location

Middle Fork Road passes less than a hundred yards away. Reaching the water takes no effort worth mentioning. National forest, low down for the mountains. The snow figure is about seven feet; the year is moderately wet.

Ninemeyer Campground is six miles away. Winter is the best season on record. At the source it will burn on contact; do not get in where the water comes out, and test any pool with a hand first. Forest Service ground, open to anyone. The chemistry is from 1981.

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 Sheep Creek Bridge Hot Spring.

Aerial view of the ground around Sheep Creek Bridge Hot Spring LiDAR bare-earth view of the same ground around Sheep Creek Bridge Hot Spring
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
571 ft above the spring
Within a quarter mile, to the south
Cross-section through the spring

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

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

Heat Below
133 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
29°
Jan
32°
Feb
39°
Mar
45°
Apr
55°
May
65°
Jun
76°
Jul
75°
Aug
65°
Sep
50°
Oct
38°
Nov
28°
Dec
Annual Precip: 26.6 in Annual Snow: 85.5 in
Best Time to Visit
December Air 28°F · Water 142°F · +114° contrast
January Air 29°F · Water 142°F · +113° contrast
February Air 32°F · Water 142°F · +110° contrast
December offers 48°F more contrast than July
Current Conditions
33°F
NW 0.0 mph 98% Good soaking weather
Today 74° Low 49° Sunny
Spring is +68° warmer
Wednesday 80° Low 54° Sunny
Spring is +62° warmer
Thursday 72° Low 49° Showers And Thunderstorms Likely 71% precip
Spring is +70° warmer
Friday 73° Low 48° Mostly Sunny then Slight Chance Rain Showers 17% precip
Spring is +69° warmer
Saturday 76° Low 50° Sunny 4% precip
Spring is +66° warmer
Water Chemistry Sampled 1981-05-27

The water at Sheep Creek Bridge Hot Spring is alkaline (pH 9.5).

pH 9.5 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 50 mg/L
Supports circulation and skin hydration
Sulfate 20 mg/L
Traditionally used for skin conditions and inflammation
Chloride 2 mg/L
Natural antiseptic with skin health benefits
Where to Stay

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Nearby Camping
Ninemeyer Campground 6.1 mi away

Overview:Due to a wildfire, there are no amenities at the campground.  Currently there are no developed campfire rings therefore when Stage 1 fire restrictions area in effect, no fires are permitted.A stay at Ninemeyer Campground enables guests to enjoy all the beauty and recreation offered along the (Middle Fork Boise River Road) Forest Service (FS) Road 268. Weather is usually good from mid-May through late September and is easily accessible by car in good weather, although the road is some...

Reserve on Recreation.gov →
Temperature
142°F
Warm Hot Boiling
Water Temp 142°F (61°C)
Avg Air Temp 50°F
Above Ambient +92°F
Great soaking conditions September
Access
Open
Road Access Roadside
Nearest Road Middle Fork Road
Distance to Road 278 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 Sheep Creek Bridge Hot Spring?
Sheep Creek Bridge Hot Spring has a water temperature of 142°F (61°C). This is considered a hot spring, well above body temperature.
Where is Sheep Creek Bridge Hot Spring located?
Sheep Creek Bridge Hot Spring is located in Boise County, Idaho at 3,540 feet elevation, near Idaho City. Coordinates: 43.6960°N, 115.6580°W.
How do I get to Sheep Creek Bridge Hot Spring?
Sheep Creek Bridge Hot Spring has Roadside road access, with the nearest road being Middle Fork Road (278 ft from the road).
Is Sheep Creek Bridge Hot Spring free to visit?
Sheep Creek Bridge Hot Spring has Open access. It is managed by US Forest Service.
Can I camp near Sheep Creek Bridge Hot Spring?
Yes, Ninemeyer Campground is located nearby (6.1 miles away).
What minerals are in the water at Sheep Creek Bridge Hot Spring?
Water chemistry analysis shows the presence of pH, Calcium, Magnesium, Sodium, Sulfate, Chloride. The pH is 9.5 (alkaline).
Is it safe to soak at Sheep Creek Bridge Hot Spring?
No, not at the source. The water at Sheep Creek Bridge Hot Spring reaches 142°F, which can cause severe burns within seconds. Look for cooled side pools or downstream stretches, and test with a hand before anything else.