MBMG-25223
Montana Bureau of Mines and Geology
Located in Petroleum County, Montana, this groundwater monitoring location is associated with a water well in the Upper Cretaceous aquifers.
Well Construction
| Depth | Description | |
|---|---|---|
| -1.0-78.0 ft | 4.5 in diameter steel casing | |
| 76.0-120.0 ft | 4.0 in diameter open hole screen |
| Depth | Lithology | Description |
|---|---|---|
| 0.0-1.0 ft | unknown | TOPSOIL |
| 1.0-15.0 ft | unknown | YELLOW SANDY CLAY |
| 15.0-56.0 ft | unknown | DARK GRAY SANDY SHALE |
| 56.0-76.0 ft | unknown | HARD SANDY SHALE |
| 76.0-79.0 ft | unknown | HARD LIGHT GRAY SANDSTONE |
| 79.0-120.0 ft | unknown | SOFT GRAY SANDSTONE - WATER 75 GPM |
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Agency Montana Bureau of Mines and Geology Site Name MBMG-25223 Site Number 25223 Site Type WELL Lat/Long (NAD83) 46.8508, -108.3135 Well Depth 120 Feet Elevation (NAVD88) 3134.4 ft Latitude 46.8507955 Longitude -108.3134904 Local Aquifer Name 211EGLE EAGLE SANDSTONE (None) National Aquifer Name Upper Cretaceous aquifers (N300UPCTCS) 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 49.79 46.25 45.07 1994-07-21 2026-03-26 113 31.7 45.45 90.91 Statistics Calculated 2026-05-16 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 49.79 46.88 46.56 46.33 45.84 45.49 45.20 21 21 Jun 46.98 46.82 46.66 46.04 45.70 45.36 45.07 25 25 Sep 47.24 47.12 46.85 46.52 45.85 45.56 45.40 25 25 Dec 48.08 47.05 46.76 46.28 45.95 45.39 45.08 25 25 Statistics Calculated 2026-05-16 -
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