MBMG-90371
Montana Bureau of Mines and Geology
Located in Toole County, Montana, this groundwater monitoring location is associated with a water well in the Upper Cretaceous aquifers.
Well Construction
| Depth | Description | |
|---|---|---|
| 0.0-118.0 ft | 7.0 in diameter steel casing | |
| 106.0-115.0 ft | 7.0 in diameter drilled holes screen | |
| 116.0-126.0 ft | 7.0 in diameter drilled holes screen |
| Depth | Lithology | Description |
|---|---|---|
| 0.0-10.0 ft | unknown | CLAY |
| 10.0-36.0 ft | unknown | COLORADO SHALE |
| 36.0-126.0 ft | unknown | EAGLE SAND |
| 126.0-127.0 ft | unknown | DARK SHALE |
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Agency Montana Bureau of Mines and Geology Site Name MBMG-90371 Site Number 90371 Site Type WELL Lat/Long (NAD83) 48.9921, -111.9566 Well Depth 118 Feet Elevation (NAVD88) 3504.7 ft Latitude 48.9920883806 Longitude -111.956551169 Local Aquifer Name 211VRGL VIRGELLE SANDSTONE MEMBER (OF 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 38.84 33.47 27.87 1994-01-04 2026-04-21 1707 32.2 34.79 30.00 Statistics Calculated 2026-05-15 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 Jan 37.47 36.24 34.69 34.05 33.28 31.88 29.45 25 25 Apr 37.07 36.88 35.56 34.30 33.36 32.50 30.60 19 19 Jun 34.65 34.62 34.30 32.65 30.47 28.74 28.20 12 12 Jul 36.90 34.40 32.58 32.21 31.47 29.24 27.87 20 20 Sep 34.12 33.91 33.28 32.77 31.74 31.13 31.02 12 12 Oct 37.17 35.62 34.56 33.47 32.62 32.05 29.68 22 22 Statistics Calculated 2026-05-15 -
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