MBMG-136678
Montana Bureau of Mines and Geology
Located in Wibaux County, Montana, this groundwater monitoring location is associated with a water well in the Lower Tertiary aquifers.
Well Construction
| Depth | Description | |
|---|---|---|
| -2.0-114.0 ft | 2.0 in diameter pvc casing | |
| 108.0-114.0 ft | 2.0 in diameter perforated casing screen |
| Depth | Lithology | Description |
|---|---|---|
| 0.0-30.0 ft | unknown | CLAY MODERATELY SANDY-MODERATE YELLOWISH BROWN TO PALE YELLOW; RUST BROWN BELOW 20 FEET |
| 30.0-40.0 ft | unknown | CLAY VERY SILTY-LIGHT OLIVE GRAY TO MEDIUM GRAY |
| 40.0-97.0 ft | unknown | SAND-VERY FINE-ROUNDED-WELL SORTED; CLAYEY MEDIUM GRAY; VERY SILTY BELOW 45 FEET- HARD LEDGE AT 60 FEET |
| 97.0-116.0 ft | unknown | LIGNITE - BLACK - WATER BEARING |
| 116.0-120.0 ft | unknown | CLAY-SILTY; MEDIUM GRAY TO GREENISH GRAY |
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Agency Montana Bureau of Mines and Geology Site Name MBMG-136678 Site Number 136678 Site Type WELL Lat/Long (NAD83) 46.9473, -104.0807 Well Depth 114 Feet Elevation (NGVD29) 2817.0 ft Latitude 46.94732 Longitude -104.08065 Local Aquifer Name 125FRUN, FORT UNION FORMATION (None) National Aquifer Name Lower Tertiary aquifers (N300LTRTRY) 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 41.98 39.08 35.32 1980-09-11 2025-11-19 106 45.2 38.78 35.00 Statistics Calculated 2026-02-21 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 Feb 41.57 41.47 40.55 38.39 36.98 36.29 36.23 12 12 May 40.50 40.50 39.23 37.42 36.83 35.57 35.32 18 18 Aug 40.33 40.16 38.85 37.36 36.40 35.77 35.75 14 14 Nov 41.98 40.84 39.61 37.99 37.15 36.38 35.74 19 19 Statistics Calculated 2026-02-21 -
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