MBMG-35402
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 | |
|---|---|---|
| -1.0-12.5 ft | 5.0 in diameter steel casing | |
| 12.0-84.5 ft | 5.56 in diameter pvc casing | |
| 84.5-88.5 ft | 6.25 in diameter open hole screen |
| Depth | Lithology | Description |
|---|---|---|
| 0.0-2.0 ft | unknown | SOIL |
| 2.0-6.0 ft | unknown | SANDY BROWN CLAY |
| 6.0-34.0 ft | unknown | SANDY AND GRAVELLY BROWN CLAY |
| 34.0-36.0 ft | unknown | GRAVEL AND CLAY MIX |
| 36.0-53.0 ft | unknown | SANDY AND GRAVELLY BROWN CLAY |
| 53.0-60.0 ft | unknown | GREY CLAY |
| 60.0-62.0 ft | unknown | SAND AND CLAY MIX-WATER YEILD APPROX .75 GPM (HIGHLY MINERALIZED) |
| 62.0-64.0 ft | unknown | WEATHERED SANDSTONE-WATER APPROX .75 GPM (HIGHLY MINERALIZED) |
| 64.0-66.0 ft | unknown | SANDY GREY SHALE |
| 66.0-66.5 ft | unknown | HARD SANDSTONE |
| 66.5-80.0 ft | unknown | SANDY GREY SHALE |
| 80.0-82.5 ft | unknown | FIRM SANDY GREY SHALE |
| 82.5-83.0 ft | unknown | FIRM TO HARD SHELL |
| 83.0-85.5 ft | unknown | SANDY CRAY SHALE |
| 85.5-86.0 ft | unknown | HARD SANDSTONE; WATER |
| 86.0-87.0 ft | unknown | SANDSTONE; WATER |
| 87.0-88.5 ft | unknown | SANDY SHALE- TOTAL WATER YIELD EXCEEDING 20 GPM |
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Agency Montana Bureau of Mines and Geology Site Name MBMG-35402 Site Number 35402 Site Type WELL Lat/Long (NAD83) 47.6127, -110.1081 Well Depth 89 Feet Elevation (NAVD88) 3125.73 ft Latitude 47.6127262 Longitude -110.1080571 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 23.50 13.00 9.29 1996-08-21 2026-05-06 91 29.8 13.24 40.00 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 Aug 21.41 21.26 19.47 18.24 12.66 11.22 11.13 11 11 Nov 20.87 20.49 18.96 12.63 12.08 11.73 11.71 12 12 Statistics Calculated 2026-05-18 -
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