Montana Geothermal Sites: Blue Joint
SUMMARY INFORMATION:
Location: N 45.6963
W 114.3633
Nearest town:  30 miles SSW of Darby
County: RAVALLI
Depth: Spring
Temperature:   85 F
Flow:   224 gpm
TDS: 179 ppm
Site ID:  MGEOT230
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CHEMISTRY (ppm, mg/L)
Site name: BLUE JOINT
Temp: 29º C
TDS: 179
pH: 8.22
Sodium: 38
Potassium: 0.3
Calcium: 2.6
Magnesium: 0.1
Iron: N.A.
SiO2: 54
Sulfate: 5.0
Chloride: 3.0
Fluoride: 9.5

This spring is referenced from the Montana Geothermal Map by Sonderegger and Berantino, 1981.

Blue Joint geothermal site