MBMG-256853
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 | |
|---|---|---|
| -2.5-228.0 ft | 6.0 in diameter a53b steel casing | |
| 227.0-237.0 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. |
| 186.0-237.0 ft | unknown | SAND & GRAVEL. FINE TO COARSE SAND, REDDISH-BROWN & MEDIUM TO FINE GRAINED GRAVEL. PEBBLES ROUNDED TO SUB-ROUNDED. SOME SILT. AT 200 FEET Q = 20 TO 25 GPM. AT 240 FEET Q = 50 TO 60 GPM. |
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Agency Montana Bureau of Mines and Geology Site Name MBMG-256853 Site Number 256853 Site Type WELL Lat/Long (NAD83) 45.2256, -111.7204 Well Depth 237 Feet Elevation (NAVD88) 5321.316 ft Latitude 45.22557398 Longitude -111.7204487 Local Aquifer Name 112SNGR SAND AND GRAVEL (PLEISTOCENE) (None) National Aquifer Name Northern Rocky Mountains Intermontane Basins aquifer systems (S100NRMTIB) Aquifer Type UNCONFINED Water-Level Well Type Trend Water-Level Well Characteristics Background Water Quality Network MONTANA GWIC Additional info Link 1 -
Activity Start Date Activity Start Time Characteristic Name Measure Value Units Detection Limit Value Type Sample Fraction Method Name Analytical Method System Sample Method ID Sample Method ID Context Sample Method Name Activity Type Code Data Provided By -
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How do we calculate statistics?
Overall Water Level Statistics (Depth to water, feet below land surface) Lowest Water Level Median Water Level Highest Water Level First Measurement Date Last Measurement Date Number of Measurements Years of Record Latest Value Latest Percentile 152.18 147.95 141.72 2010-07-20 2025-12-31 4617 15.4 149.62 0.0 Statistics Calculated 2026-05-18 Monthly Water Level Statistics (Depth to water, feet below land surface) Month Lowest Median 10th Percentile 25th Percentile 50th Percentile 75th Percentile 90th Percentile Highest Median Number of Measurements Years of Record Jan 150.03 149.88 149.51 148.24 147.59 146.76 146.69 14 14 Feb 150.92 150.77 150.32 149.28 148.79 147.73 147.63 13 13 Mar 151.34 151.19 150.86 149.87 148.91 147.54 146.23 15 15 Apr 151.98 151.71 151.32 150.50 149.65 148.68 148.54 14 14 May 151.69 151.61 151.28 149.72 149.41 148.28 148.12 13 13 Jun 150.73 150.42 149.82 147.99 147.47 146.31 146.14 13 13 Jul 148.75 148.64 147.91 147.05 145.46 144.21 144.12 14 14 Aug 148.46 148.45 147.44 146.05 144.90 143.13 142.96 14 14 Sep 148.49 148.31 147.56 145.58 144.24 142.73 141.72 16 16 Oct 148.06 147.99 147.23 145.40 144.40 143.68 143.57 14 14 Nov 148.64 148.47 147.63 145.79 145.23 144.51 144.44 14 14 Dec 149.48 149.33 148.70 146.94 145.91 144.58 142.73 16 16 Statistics Calculated 2026-05-18 -
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