MBMG-38260
Montana Bureau of Mines and Geology
Located in Chouteau County, Montana, this groundwater monitoring location is associated with a water well in the Upper Cretaceous aquifers.
Well Construction
| Depth | Description | |
|---|---|---|
| -2.5-18.5 ft | 5.0 in diameter abs-sched 40 casing | |
| 18.5-335.5 ft | 5.0 in diameter pvc casing | |
| 165.0-335.0 ft | 5.0 in diameter drilled holes screen | |
| 335.5-347.0 ft | 5.0 in diameter open hole screen |
| Depth | Lithology | Description |
|---|---|---|
| 0.0-4.0 ft | unknown | GRAVELLY SOIL |
| 4.0-20.0 ft | unknown | SANDY BROWN CLAY |
| 20.0-52.0 ft | unknown | GRAVELLY AND BOULDERY BROWN CLAY |
| 52.0-56.0 ft | unknown | BROWN SILT AND SAND |
| 56.0-62.0 ft | unknown | GRAVELLY BROWN CLAY |
| 62.0-70.0 ft | unknown | GREY SHALE |
| 70.0-76.0 ft | unknown | LT GREY SHALE |
| 76.0-83.0 ft | unknown | BLUE-GREY SHALE |
| 83.0-90.0 ft | unknown | SANDY GREY SHALE |
| 93.0-101.0 ft | unknown | GREY SHALE |
| 101.0-106.0 ft | unknown | GREY SANDSTONE (DRY) |
| 106.0-118.0 ft | unknown | BLUE SHALE |
| 118.0-125.0 ft | unknown | SANDSTONE |
| 125.0-135.0 ft | unknown | BLUE GREY SHALE |
| 135.0-154.5 ft | unknown | SANDY BLUE GREY SHALE |
| 154.0-155.0 ft | unknown | HARD SHELL |
| 155.0-159.0 ft | unknown | SANDY GREY SHALE-IROVY SHELL |
| 159.0-174.0 ft | unknown | SANDY BLUE-GREY SHALE |
| 174.0-176.0 ft | unknown | SHALEY SANDSOTNE |
| 176.0-183.0 ft | unknown | GREY SANDSTONE WATER |
| 183.0-236.0 ft | unknown | GREY AND DARK GREY SHALE |
| 236.0-236.5 ft | unknown | SEMI-HARD SANDSTONE RIB |
| 236.5-254.5 ft | unknown | SHALEY SANDSTONE AND SANDY SHALE |
| 254.5-264.0 ft | unknown | SANDY LT BROWN AND LT GREY SHALE |
| 264.0-276.0 ft | unknown | GREY SANDSTONE - WATER |
| 276.0-316.0 ft | unknown | GREY AND SANDY GREY SHALE-SANDSTONE LAYERS |
| 316.0-335.0 ft | unknown | GREY SANDSTONE - WATER |
| 335.0-336.5 ft | unknown | VERY HARD SANDSTONE |
| 336.5-346.0 ft | unknown | GREY SANDSTONE - WATER |
| 346.0-370.0 ft | unknown | GRAY LT GRAY AND LT BROWN SHALE |
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Agency Montana Bureau of Mines and Geology Site Name MBMG-38260 Site Number 38260 Site Type WELL Lat/Long (NAD83) 48.0198, -109.9413 Well Depth 347 Feet Elevation (NGVD29) 3402.0 ft Latitude 48.0198 Longitude -109.9413 Local Aquifer Name 211JDRV JUDITH RIVER FORMATION (OF MONTANA GROUP) (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 162.12 147.62 140.40 1996-08-22 2026-05-05 79 29.8 142.43 90.909 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 May 158.23 158.03 152.82 145.67 143.58 142.43 142.43 10 10 Nov 152.71 152.68 149.29 147.71 145.04 143.83 143.81 10 10 Statistics Calculated 2026-05-18 -
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