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Montana Geothermal Sites: Boulder Hot Springs
SUMMARY INFORMATION:
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| Location: N 46.1972 W 112.0938 Nearest town: 4 miles south of Boulder County: Jefferson Depth: Spring Temperature: 76° C, 165°F Flow: 500 gpm, 1900 L/min TDS: 420 (mg/L) Site ID: MGEOT350 LOCATE AND VIEW VIA NRIS DIGITAL MAP LOCATOR: Allows resizing of topos and access to aerial photographs. |
CHEMISTRY (ppm, mg/L) Site name: BOULDER Temp: 74° C TDS : 421 pH: 8.89 Sodium: 118.2 Potassium: 4.1 Calcium: 2.0 Magnesium: 0.3 Iron: 0.08 Boron: 0.46 SiO2: 98.50 Sulfate: 80.0 Chloride: 22.0 Fluoride: 11.1 |
The Boulder hot springs consist of about 26 hot springs covering 2 ½ acres adjacent to the resort facilities. Discharge from several of the springs are gathered and piped to the hotel for space heating, indoor baths, and an outdoor pool.
The surface temperature averages 160 F. Geothermic calculations suggest deep reservoir temperature ranges of 241-289 F (116-143 C). The total volume of springs complex is estimated to be 1,000 gpm in the spring. Structural studies by Montana State University (1977), indicate that the springs are controlled by north-south faults in the granite rock of the Boulder Batholith. The fissures are nearly sealed at the surface by deposition of silica and calcite. Two north-south trending faults occur south of the springs and could be structural controls to the deep waters.
Additional economic use may be applicable for the hot springs reservoirs, which appear to extend north of the surface springs. Potential use in the general area include; space heat for the Boulder schools, Jefferson County buildings, Boulder Hospital, a town heating district, and a greenhouse complex.
Montana’s historic Boulder Hot Springs Inn and Spa is located almost midway between Butte and Helena just off Interstate 15. It rests in the midst of southwest Montana’s spectacular beauty of snowcapped mountains and lush valleys. The Inn & Spa sits on almost 300 acres of pristine meadows, wetlands and forest. The air is pure and the sounds you hear are those of nature. The Inn is backed by Deerlodge National Forest, home to bear, moose, elk, deer, fox, antelope and coyotes.
The Inn offers a combination of comfortable, inviting, elegant & luxurious B&B rooms & suites for guests who want the best that a healing, homelike atmosphere has to offer, and guest rooms for our more budget-minded guests.
Boulder Hot Springs specialize in healthy, healing, active living and luxury at an affordable price, Boulder Hot Springs Inn and Spa, with the Conference and Retreat Center, has chosen to be an alcohol, drug and smoke-free environment. Contact:Boulder Hot Springs HH,PO BOX 930, Boulder, MT 59632, 406-225-4339.
