MBMG-148191

Montana Bureau of Mines and Geology

Located in Flathead 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
-2.5-397.5 ft 6.0 in diameter steel casing
397.5-397.5 ft 6.0 in diameter open bottom screen
Depth Lithology Description
0.0-20.0 ft unknown RELATIVELY CLEAN GRAVEL WITH COBBLES AND LARGE BOULDERS AT ABOUT 10 TO 15 FT.
20.0-48.0 ft unknown CLEAN FINE/MED GRAVEL MINIMAL COBBLES NO BOULDERS MIXED ARGILLITEL QTZITE CLASTS MULTICOLORED RED GREEN AND GRAYS
48.0-52.0 ft unknown TAN/BROWN CLAYS WITH IN GRAVELS
52.0-70.0 ft unknown CLEAN FINE/MED GRAVELS MIXED LITHOLOGIES & COLORS
70.0-78.0 ft unknown DIRTY YELLOW BROWN/TAN SILT LADEN GRAVEL
78.0-98.0 ft unknown DIRTY LIGHT GREY CLAY AND SILT LADEN GRAVEL WITH INC IN RED/BROWN QTZITE CLASTS AND GREY SILTSTONE
98.0-110.0 ft unknown LIGHT GREY CLAYS WITH MIN GRAVEL
110.0-115.0 ft unknown SILTY TAN VERY COARSE SAND FINE TO MED GRAVELS
115.0-128.0 ft unknown RELATIVELY CLEAN VERY COARSE SAND/GRAVELS SILT SEEPS WATER AFTER 120 FT.
128.0-143.0 ft unknown LIGHT BRONW YELLOW BROWN SILTY GRAVEL AND VERY COARSE SAND. INC IN ALIVE GREEN ARGILLITE SEEPS WATER CLEANS QUICKLY FROM YELLOW BROWN TO MILKY WHITE
143.0-160.0 ft unknown AS ABOVE WITH HIGH SILT CONTENT AND LOSS WATER
160.0-173.0 ft unknown CLAY (TAN/YELLOW BROWN) WITH MINOR COARSE SAND AND FINE GRAVEL
173.0-192.0 ft unknown BACK TO HEAVY SILT AND FINE/MED GRAVELS VARYING AMOUNT COASE SAND LITTLE SEEPAGE
192.0-197.0 ft unknown ZONE COBBLES BOULDER 2' AND DARK GREY ARGILLITE COMPOSITION
197.0-215.0 ft unknown CONTINUED FINE/MED GRAVEL HIGH SILT MINIMAL WATER INC IN ND QTZITE DISTS.
215.0-222.0 ft unknown CLEAN MORE OR LESS SILT FREE COARSE SAND AND FINE/MED GRAVEL SOME SMALL COBBLES. MODERATE WATER FLOW CLEAN. TOUGHER AND SLOWER DRILLWING WITH QTZITE CLASTS. NO CEMENTS NOTED. ABOUT 15GPM
227.0-239.0 ft unknown RELATIVELY CLEAN TITE GRAVELS VERY SLOW DRILLING NO CHANGE COMPOSITION WATER ONLY 7-8 GPM
239.0-247.0 ft unknown LOOSE FINE/MED GRAVEL WITH LIGHT SILT ABOUT 15 GPM
247.0-265.0 ft unknown INC IN WATER ABOUT 30 GPM. EASY DRILLING LOOSE FINE/MED GRAVEL MODERATE SILT (ORANGE BROWN) AND MED TO COARSE SAND
265.0-270.0 ft unknown CLENER WITH SANDS ABOUT 50-60 GPM. LOOSE & EASY DRILLING
270.0-278.0 ft unknown BACK TO SILTY SAND GRAVELS STILL MIXED COMPOSITION /COLOR WITH SOME BRICK RED QTZITES AND MINOR GREY CARBONATE DUSTS
278.0-282.0 ft unknown TITE GRAVELS LESS WATER SLOWER DRILLING
282.0-288.0 ft unknown CLEANER MORE WATER 60 GPM MEASURED BY BUCKET
288.0-296.0 ft unknown SILTY SAND GRAVE LOOSE
296.0-301.0 ft unknown TITE GRAVEL SLOW LESS WATER
301.0-328.0 ft unknown SILTY SLT SAND GRAVELS OF MIXED COLOR/COMPOSITION. LOSS OF CIRCULATION
328.0-348.0 ft unknown TRIPPED OUT DOWN HOLE HAMMER AND RESET. LOOSE SILTY AND SANDY FINE/MED. GRAVEL SOME WATER
348.0-353.0 ft unknown TIGHTER LESS WATER CLEANER
353.0-368.0 ft unknown LOOSE SILTY & SANDY GRAVEL. SAME MIXED COLOR/ COMPOSITION. SUBROUNDED TO SUBANGULAR MOD WATER
368.0-378.0 ft unknown INC WATER FLOW WINTH/INC IN MED/COARSE SAND IN FINE/MED GRAVEL. VERY LOOSE EST. 100 GPM.
378.0-397.4 ft unknown TEN FT VERY SILTY SAND/GRAVEL WITH WATER DECREASING LAST TEN FT RETURN TO LOOSER SANDY + SILTY GRAVELS MEAS FLOW (BUCKET) AFTER 15 MIN DEVELOPMENT TIME 3SEC/5GAL (100 GPM)

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