MBMG-170202
Montana Bureau of Mines and Geology
Located in Lewis and Clark County, Montana, this groundwater monitoring location is associated with a water well in the Northern Rocky Mountains Intermontane Basins aquifer systems.
Well Construction
| Depth | Description | |
|---|---|---|
| -2.0-20.0 ft | 6.0 in diameter steel casing | |
| 20.0-300.0 ft | 4.0 in diameter unreported casing | |
| 180.0-300.0 ft | 4.0 in diameter slots screen |
| Depth | Lithology | Description |
|---|---|---|
| 0.0-1.0 ft | unknown | TOPSOIL |
| 1.0-80.0 ft | unknown | CLAY & SHALE |
| 80.0-300.0 ft | unknown | SHALE |
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Agency Montana Bureau of Mines and Geology Site Name MBMG-170202 Site Number 170202 Site Type WELL Lat/Long (NAD83) 46.7176, -111.9134 Well Depth 300 Feet Elevation (NGVD29) 3845.0 ft Latitude 46.71763741 Longitude -111.9134249 Local Aquifer Name 400SPKN, SPOKANE SHALE (None) National Aquifer Name Northern Rocky Mountains Intermontane Basins aquifer systems (S100NRMTIB) Aquifer Type UNCONFINED Water-Level Well Type Trend Water-Level Well Characteristics Known Changes 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 140.26 109.80 86.21 2000-04-21 2025-12-05 230 25.7 125.82 9.5238 Statistics Calculated 2026-05-16 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 123.92 123.74 118.76 108.86 98.59 95.74 95.57 16 16 Feb 125.32 121.94 115.77 100.4 93.93 88.18 87.76 18 18 Mar 121.46 120.82 118.43 106.05 96.59 92.07 90.62 19 19 Apr 127.32 121.32 120.41 106.86 96.06 91.37 86.21 21 21 May 131.24 128.23 122.58 105.24 97.35 94.28 93.62 14 14 Jun 130.87 130.30 125.10 110.41 96.06 94.82 94.36 17 17 Jul 140.26 136.16 132.42 119.77 109.16 102.98 100.86 15 15 Aug 140.22 135.23 130.58 121.31 105.04 93.40 92.30 21 21 Sep 138.25 137.23 127.95 116.54 102.29 96.15 94.46 18 18 Oct 135.96 134.92 122.89 110.41 99.91 91.50 88.15 19 19 Nov 127.46 126.79 120.46 108.39 96.95 92.17 88.99 18 18 Dec 126.82 125.67 123.57 113.58 99.46 95.59 93.98 20 20 Statistics Calculated 2026-05-16 -
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