MBMG-3772
Montana Bureau of Mines and Geology
Located in Sheridan County, Montana, this groundwater monitoring location is associated with a water well in the Lower Tertiary aquifers.
Well Construction
| Depth | Description | |
|---|---|---|
| 0.0-318.0 ft | 4.0 in diameter plastic casing | |
| 303.0-313.0 ft | 4.0 in diameter saw slots screen |
| Depth | Lithology | Description |
|---|---|---|
| 0.0-10.0 ft | unknown | YELLOW-BROWN SILTY TO V COARSE SAND- CARBONATE RICH |
| 10.0-30.0 ft | unknown | MEDIUM GRAVEL- THIN SILT INTERBEDS |
| 30.0-40.0 ft | unknown | YELLOW SILT WITH COAL SLACK |
| 40.0-69.0 ft | unknown | GRAY SILT WITH COAL SLACK |
| 69.0-81.0 ft | unknown | VERY COARSE SAND- SOME FINE GRAVEL AND SAND |
| 81.0-100.0 ft | unknown | DARK GRAY SILTY TILL WITH INTERBEDS OF SILT AND CLAY (LACUSTRINE AT BASE) |
| 100.0-129.0 ft | unknown | FINE GRAVEL- CARBONATE-RICH- WITH SAND AND COAL SLACK (OUTWASH) |
| 129.0-137.0 ft | unknown | COARSE GRAVEL (OUTWASH) |
| 137.0-154.0 ft | unknown | BLACK SILT AND COAL SLACK (LACUSTRINE) |
| 154.0-166.0 ft | unknown | FINE GRAVEL WITH SOME SILTY CLAY INTERBEDS |
| 166.0-183.0 ft | unknown | DARK GRAY BROWN SILTY CLAY TILL- BOULDERS AT 174 FEET |
| 183.0-187.0 ft | unknown | GRAVEL- CARBONATE-RICH (OUTWASH) |
| 187.0-189.0 ft | unknown | LIGHT GRAY-BROWN SILT- LIMESTONE (?); FORT UNION FORMATION |
| 189.0-232.0 ft | unknown | DARK BROWN SILTY CLAY- CALCAREOUS- MICACEOUS |
| 232.0-233.0 ft | unknown | COAL |
| 233.0-245.0 ft | unknown | MEDIUM GRAY CLAYEY SAND- VERY FINE |
| 245.0-254.0 ft | unknown | SILTY CARBONACEOUS CLAY |
| 254.0-261.0 ft | unknown | OLIVE GRAY CLAYEY SAND |
| 261.0-283.0 ft | unknown | LIGHT OLIVE GRAY SILTY CARBONACEOUS CLAY |
| 283.0-298.0 ft | unknown | LIGHT MEDIUM GRAY SILT- MICACEOUS |
| 298.0-313.0 ft | unknown | COAL |
| 313.0-318.0 ft | unknown | LIGHT MEDIUM GRAY MICACEOUS CLAY |
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Agency Montana Bureau of Mines and Geology Site Name MBMG-3772 Site Number 3772 Site Type WELL Lat/Long (NAD83) 48.555, -104.1818 Well Depth 318 Feet Elevation (NAVD88) 1976.85 ft Latitude 48.554959 Longitude -104.18183 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 12.26 10.11 6.30 1984-07-26 2025-10-25 269 41.2 10.20 48.48 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 Apr 10.90 10.73 10.35 9.89 9.58 7.85 6.30 23 23 May 10.87 10.72 10.28 9.91 9.70 9.23 9.08 23 23 Jun 11.01 10.77 10.44 9.84 9.71 9.38 9.18 25 25 Jul 11.04 10.54 10.29 9.91 9.71 8.52 6.70 26 26 Aug 11.19 10.99 10.65 10.15 9.89 9.48 6.46 30 30 Sep 12.26 11.02 10.65 10.18 9.76 9.56 6.74 28 28 Oct 11.60 11.01 10.56 10.19 9.58 8.65 6.44 32 32 Statistics Calculated 2026-05-18 -
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