Brooks Warm Spring
Brooks Warm Spring emerges at a mild 68°F in central Montana, requiring a short walk of about 998 meters from the nearest road. USGS data confirms a temperature of 19.6°C. The water is calcium-sulfate dominant, with 130 mg/L calcium, 330 mg/L sulfate, and total dissolved solids of 659 mg/L at near-neutral pH 7.4.
The spring rises at 3,795 feet in the prairie-mountain transition zone of Fergus County, south of Lewistown. Rolling grassland and scattered timber mark the landscape where the Judith Mountains and Big Snowy Mountains interrupt the plains. The terrain is open rangeland with seasonal creeks cutting shallow coulees. Annual precipitation reaches 21 inches, with 53 inches of snowfall, creating green-up conditions in spring that brown out by midsummer across the surrounding benchlands.
The spring is too cool for hot-soaking but supports an interesting thermal-biological environment. Visit in late spring or early summer when access roads are dry and the surrounding hills are green. Bring water and sun protection, as the open prairie offers little shade. The nearest town, Lewistown, sits roughly 20 miles north and provides all services. No permits are currently required.
Little published history documents this spring specifically. The name likely references an early settler or rancher in the area. The Lewistown vicinity attracted homesteaders in the early 1900s who relied on local water sources. The spring's calcium-rich, sulfate-heavy chemistry suggests deep circulation through Paleozoic limestone and gypsum beds that underlie much of central Montana's sedimentary terrain.
The water at Brooks Warm Spring is slightly alkaline (pH 7.4) with 659 mg/L total dissolved solids. It is notably rich in calcium (may support bone density and joint health), magnesium (known for muscle relaxation and stress relief), and sulfate (traditionally used for skin conditions and inflammation).
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Brooks Warm Spring is road-accessible, so you can bring more gear. Cold air temperatures make a changing robe or warm layers essential.
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Springs Near Brooks Warm Spring
More Springs Around 68°F
Slightly Alkaline Springs (pH ~7.4)
Hike 1 waterfall near Brooks Warm Spring
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