Brockman Creek Hot Spring
Brockman Creek Hot Spring stands apart from most Idaho thermal springs with its unusual water chemistry: a slightly acidic pH of 6.4 and extremely high sodium at 2,100 mg/L paired with 2,500 mg/L sulfate. At 95 degrees Fahrenheit, it sits at body temperature on state-managed land at 6,256 feet elevation near Ammon in Bonneville County.
The spring emerges beside Brockman Road at the edge of a high mountain valley where annual snowfall tops eight and a half feet. The water carries a noticeable mineral taste and faint eggy smell from its elevated sulfate content. Surrounding terrain rolls with sagebrush meadows and scattered timber at this elevation. In winter, snow buries the landscape and steam marks the spring's location from a distance. Summer brings wildflowers and the steady sound of water seeping through mineralized ground into the creek drainage.
Unlike the alkaline springs that dominate Idaho's geothermal landscape, Brockman Creek's acidic character and heavy mineral loading suggest a different subsurface pathway, likely through sulfur-rich rock formations. The spring sits on Idaho Department of Lands property designated as a Special Recreation Management Area. Its sodium concentration of 2,100 mg/L makes it one of the most mineralized thermal features in the state, comparable to some Great Basin brines.
The spring is essentially roadside, just 52 feet from Brockman Road, though conditions on this route vary seasonally. Caribou Mountain Guard Station is the nearest reservable lodging, about 10 miles away and accessible only by snowmobile or skis in winter. Water temperature of 95 degrees makes direct contact comfortable, but the extremely high mineral content may irritate sensitive skin. Bring fresh water for rinsing.
Is Brockman Creek Hot Spring worth visiting?
Best for
- Warm-water soaking
- Easy day trips
- Overnight camping trips
The water at Brockman Creek Hot Spring is slightly acidic (pH 6.4). It is notably rich in calcium (may support bone density and joint health), magnesium (known for muscle relaxation and stress relief), and sodium (supports circulation and skin hydration).
Overview Caribou Mountain and the National Forest are named after a man known as "Cariboo Jack," who discovered gold in this area in 1870. He was an adventurous man who became a local legend. Today, the guard station on Caribou Mountain is a haven for adventurers who enjoy a variety of recreational activities. The guard station can be accessed by car during the warmer months, but only snowmobiles or skis can be used in winter. Guests should be prepared to make the 6-mile trek with all the...