MBMG-149530
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 | |
|---|---|---|
| 165.0-425.0 ft | 4.0 in diameter pvc casing | |
| -2.0-279.3 ft | 6.0 in diameter steel casing | |
| 405.0-425.0 ft | 4.0 in diameter saw slots screen |
| Depth | Lithology | Description |
|---|---|---|
| 0.0-1.0 ft | unknown | TOPSOIL |
| 1.0-50.0 ft | unknown | COARSE OVERBURDEN TO SILT |
| 50.0-68.0 ft | unknown | MEDIUM OVERBURDEN TO SILT |
| 68.0-82.0 ft | unknown | COARSE ALLUVIAL TILL |
| 82.0-105.0 ft | unknown | COBLES & GRAVELS SANDY |
| 105.0-180.0 ft | unknown | SANDS & GRAVELS TIGHT SOME CLAY STRINGERS |
| 180.0-220.0 ft | unknown | GRAVELS & COBBLES VERY TIGHT |
| 220.0-238.0 ft | unknown | DARK BROWN SILTS STICKY |
| 238.0-280.0 ft | unknown | TIGHTS SLIGHTLY CEMENTED SANDS & GRAVELS TO SECTIONS OF CEMENTED GRAVELS |
| 280.0-360.0 ft | unknown | CEMENTED SANDS & GRAVELS |
| 360.0-425.0 ft | unknown | BASALT W/SECTIONS OF CEMENT SANDS AND GRAVELS. BLEEDS SOME SAND. HARD TO GET DECENT RETURNS. PRODUCTION VARIES W/AIR FROM 10 TO 30 GPM. |
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Agency Montana Bureau of Mines and Geology Site Name MBMG-149530 Site Number 149530 Site Type WELL Lat/Long (NAD83) 45.1815, -111.6011 Well Depth 425 Feet Elevation (NAVD88) 5732.969 ft Latitude 45.18154517 Longitude -111.6011445 Local Aquifer Name 120SNGR SAND AND GRAVEL (TERTIARY) (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 379.00 357.60 334.20 2008-07-17 2025-09-25 88 17.2 349.50 100.0 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 Mar 377.30 371.72 364.50 357.20 350.20 346.58 343.40 15 15 Jun 374.90 373.40 364.80 361.95 356.80 353.05 352.00 14 14 Dec 377.60 374.32 364.00 356.90 350.80 338.52 334.20 13 13 Statistics Calculated 2026-05-18 -
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