MBMG-256859
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 | |
|---|---|---|
| -2.5-242.0 ft | 6.0 in diameter a53b steel casing | |
| 239.0-249.0 ft | 5.0 in diameter screen-continuous-stainless screen |
| Depth | Lithology | Description |
|---|---|---|
| 0.0-2.0 ft | unknown | TOP SOIL, BROWN |
| 2.0-42.0 ft | unknown | SAND, MEDIUM TO FINE, AND MEDIUM TO COARSE GRAVEL. PEBBLES ROUNDED TO SUB ROUNDED. BROWN TO LIGHT GREY. IN GRAVEL PIT CUT CAN SEE MATRIX SUPPORTED COBBLES. |
| 42.0-53.0 ft | unknown | SAND, FINE TO MEDIUM WITH SOME SILT, BROWN. |
| 53.0-55.0 ft | unknown | CLAY AND FINE SAND, LIGHT BROWN, WITH SOME SILT. |
| 55.0-75.0 ft | unknown | CLAY, GREENISH-BROWN WITH SOME SILT. |
| 75.0-87.0 ft | unknown | SAND, FINE GRAINED, WITH SOME SILT, BROWN. |
| 87.0-93.0 ft | unknown | SAND, FINE AND CLAY, BROWN. |
| 93.0-98.0 ft | unknown | CLAY, GREENISH-GREY (DISTINCT COLOR CHANGE). STARTING TO SHOW WATER AT 95 FEET. |
| 98.0-100.0 ft | unknown | SAND, FINE, AND CLAY, BROWN. |
| 100.0-132.0 ft | unknown | SAND, FINE, WITH SOME SILT. |
| 132.0-135.0 ft | unknown | CLAY, GREY, SOME FINE SAND. |
| 135.0-174.0 ft | unknown | SAND, FINE, WITH SOME SILT, BROWN. |
| 174.0-193.0 ft | unknown | CLAY, GREY, WITH SOME FINE SAND AND SILT. |
| 193.0-195.0 ft | unknown | CLAY, LIGHT BROWN-TAN. (COLOR CHANGE) HEAVING SAND AT 195 FEET, HALF SAND, HALF WATER. |
| 195.0-208.0 ft | unknown | SAND, FINE TO MEDIUM, BROWN. |
| 208.0-214.0 ft | unknown | CLAY, TAN, WITH SOME FINE SAND AND SILT. |
| 214.0-219.0 ft | unknown | SAND, FINE, AND SILT, BROWN. |
| 219.0-234.0 ft | unknown | CLAY, GREY, WITH SOME FINE SAND AND SILT. |
| 234.0-249.0 ft | unknown | SAND, FINE WITH SOME SILT, BROWN. HEAVING, 30 GPM BETWEEN 240 AND 250 FEET. |
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Agency Montana Bureau of Mines and Geology Site Name MBMG-256859 Site Number 256859 Site Type WELL Lat/Long (NAD83) 45.3932, -111.7301 Well Depth 249 Feet Elevation (NAVD88) 4941.145 ft Latitude 45.39315866 Longitude -111.7300842 Local Aquifer Name 120SNGR SAND AND GRAVEL (TERTIARY) (None) National Aquifer Name Northern Rocky Mountains Intermontane Basins aquifer systems (S100NRMTIB) Aquifer Type CONFINED 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 71.39 65.92 61.15 2010-08-02 2025-12-11 4762 15.3 67.11 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 66.07 66.01 65.80 65.06 64.15 63.31 63.18 13 13 Feb 66.81 66.76 66.43 65.79 65.26 64.49 64.37 13 13 Mar 68.45 67.78 67.17 66.70 66.27 65.51 65.26 15 15 Apr 69.93 69.87 69.03 68.03 67.07 66.57 66.44 13 13 May 70.66 70.58 70.30 69.56 68.10 67.73 67.52 13 13 Jun 70.11 70.07 69.22 68.32 67.42 64.67 64.32 15 15 Jul 69.64 69.27 68.55 67.06 63.72 63.24 63.19 14 14 Aug 68.34 68.22 67.29 65.80 62.67 62.39 62.38 15 15 Sep 68.64 67.57 66.28 65.20 62.37 61.84 61.51 15 15 Oct 68.09 66.82 65.98 64.53 62.86 61.91 61.49 16 16 Nov 67.76 66.38 65.12 64.33 62.95 62.46 62.24 15 15 Dec 67.01 66.90 65.29 64.55 63.38 62.92 62.67 16 16 Statistics Calculated 2026-05-18 -
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