MBMG-256852

Montana Bureau of Mines and Geology

Located in Madison 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
-2.5-448.0 ft 6.0 in diameter a53b steel casing
447.0-457.0 ft 5.0 in diameter screen-continuous-stainless screen
Depth Lithology Description
0.0-2.0 ft unknown TOP SOIL, BROWN
2.0-60.0 ft unknown SAND & GRAVEL. MEDIUM TO COARSE GRAINED SAND, LIGHT BROWN, WITH MEDIUM TO FINE GRAINED GRAVEL. GRAVEL ROUNDED TO SUB-ROUNDED WITH QUARTZITE, GRANITE & LIMESTONE PEBBLES.
60.0-90.0 ft unknown SAND, WITH SOME GRAVEL. MEDIUM TO FINE GRAINED SAND, LIGHT BROWN WITH SOME FINE TO MEDIUM GRAINED GRAVEL & SILT.
90.0-155.0 ft unknown SAND & GRAVEL. MEDIUM TO FINE GRAINED SAND, BROWN TO REDDISH BROWN & MEDIUM TO FINE GRAINED GRAVEL, ROUNDED TO SUB ROUNDED, MODERATELY SORTED. SOME COARSE GRAVEL--PEBBLES--AND SOME SILT.
155.0-175.0 ft unknown CUTTINGS MOIST, SAME SAND & GRAVEL.
175.0-183.0 ft unknown CUTTINGS WET, SAME SAND & GRAVEL.
183.0-186.0 ft unknown SAND, MEDIUM TO COARSE, REDDISH BROWN WITH LITTLE GRAVEL.
186.0-253.0 ft unknown SAND & GRAVEL. FINE TO COARSE SAND, REDDISH-BROWN & MEDIUM TO FINE GRAINED GRAVEL. PEBBLES ROUNDED TO SUB-ROUNDED. SOME SILT. AT 200 FT Q = 20 TO 25 GPM. AT 240 FT Q = 50 TO 60 GPM.
253.0-255.0 ft unknown CLAY, TAN TO LIGHT BROWN, SLIGHTLY MOIST.
255.0-340.0 ft unknown SAND AND GRAVEL. FINE TO COARSE SAND, REDDISH-BROWN AND MEDIUM TO FINE GRAINED GRAVEL. PEBBLES ROUNDED TO SUB-ROUNDED. SOME SILT.
340.0-345.0 ft unknown SLIGHT COLOR CHANGE FROM REDDISH BROWN TO LIGHT TAN-BROWN. SAND AND GRAVEL.
345.0-386.0 ft unknown SAND AND GRAVEL. FINE TO COARSE SAND, REDDISH-BROWN AND MEDIUM TO FINE GRAINED GRAVEL. PEBBLES ROUNDED TO SUB-ROUNDED. SOME SILT. AT 355 Q > 100 GPM.
386.0-393.0 ft unknown CLAY, LIGHT BROWN-TAN, MOIST
393.0-405.0 ft unknown SAND. FINE TO MEDIUM SAND, REDDISH BROWN WITH SOME SILT AND SOME FINE GRAVEL.
405.0-457.0 ft unknown SAND & GRAVEL. MEDIUM TO COARSE GRAINED SAND WITH SOME FINE, REDDISH-BROWN, AND MEDIUM TO FINE GRAINED GRAVEL. PEBBLES ROUNDED TO SUB-ROUNDED. SOME SILT. Q > 100 GPM.

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