MBMG-149512

Montana Bureau of Mines and Geology

Located in Beaverhead County, Montana, this groundwater monitoring location is associated with a water well in the Northern Rocky Mountains Intermontane Basins aquifer systems.

Well Construction

Depth Description
-1.9-331.0 ft 6.0 in diameter steel casing
275.0-280.0 ft 6.0 in diameter perforated casing screen
285.0-300.0 ft 6.0 in diameter perforated casing screen
Depth Lithology Description
0.0-65.0 ft unknown MIX OF COARSE AND FINE GRAVEL SAND AND SILT; 10 GPM @ 63 FT
65.0-67.0 ft unknown CLAY
67.0-78.0 ft unknown GRAVELLY SAND WITH SILT 25 GPM
78.0-142.0 ft unknown BROWN CLAY WITH TRACE OF THE SAND; 20 GPM @ 137 FT.
142.0-175.0 ft unknown MINOR GRAVEL MOSTLY COARSE - MED. SAND WITH PYRITE AND SILT; 30 GPM
175.0-192.0 ft unknown CLAY
192.0-268.0 ft unknown SILT/CLAY WITH HEAVING CORASE/MED SAND WITH MINOR GRAVEL; CLAY HARD AND FORMING CLUMPS; DISCHARGE DECREASING FROM 30 GPM TO 5 GPM
268.0-277.0 ft unknown SILT/CLAY AND MED FINE SAND WITH MINOR GRAVEL; CLAY HARDENED INTO CLUMPS AND CHIPS
277.0-312.0 ft unknown CORASE SAND AND CLAY WITH MINOR GRAVEL: 20 TO 20 GPM
312.0-350.0 ft unknown GREYISH SILT/CLAY WITH MINOR SAND NO COARSE SAND OR GRAVEL
350.0-400.0 ft unknown GREYISH SILT/CLAY WITH MINOR COARSE AND MED SAND 1-2 GPM

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