MBMG-184470
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 | |
|---|---|---|
| 100.0-200.0 ft | 4.0 in diameter pvc casing | |
| -2.0-118.0 ft | 6.0 in diameter steel casing | |
| 180.0-200.0 ft | 4.0 in diameter factory slotted screen |
| Depth | Lithology | Description |
|---|---|---|
| 0.0-2.0 ft | unknown | TOPSOIL |
| 2.0-7.0 ft | unknown | SANDY CLAY |
| 7.0-54.0 ft | unknown | CLAYBOUND GRAVELS |
| 54.0-62.0 ft | unknown | TAN CLAY |
| 62.0-105.0 ft | unknown | TAN CLAY W/GRAVELS |
| 105.0-110.0 ft | unknown | BROWN/RED CLAY |
| 110.0-200.0 ft | unknown | MED HARD BROWN CLAYSTONE W/HARD PACKED GRAVEL LAYERS |
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Agency Montana Bureau of Mines and Geology Site Name MBMG-184470 Site Number 184470 Site Type WELL Lat/Long (NAD83) 45.681, -111.78 Well Depth 240 Feet Elevation (NAVD88) 5022.316 ft Latitude 45.68097 Longitude -111.77997 Local Aquifer Name 120SDMS SEDIMENTS (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 89.77 86.04 79.59 2002-04-17 2025-12-31 92 23.7 86.57 13.33 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 Mar 86.86 86.61 86.23 85.81 84.73 83.97 83.94 14 14 Jun 88.98 88.42 87.33 86.49 85.57 84.57 84.42 14 14 Sep 89.77 89.68 89.30 87.87 86.42 86.17 86.15 11 11 Dec 86.86 86.71 86.47 85.52 84.50 83.48 83.09 14 14 Statistics Calculated 2026-05-18 -
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