MBMG-62261
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 | |
|---|---|---|
| -1.5-20.0 ft | 6.0 in diameter steel casing | |
| 10.0-140.0 ft | 4.625 in diameter pvc casing | |
| 80.0-140.0 ft | 4.0 in diameter perforated casing screen |
| Depth | Lithology | Description |
|---|---|---|
| 0.0-4.0 ft | unknown | TOPSOIL |
| 4.0-12.0 ft | unknown | CLAY AND BROKEN ROCK |
| 12.0-25.0 ft | unknown | DECOMPOSED LIMESTONE |
| 25.0-140.0 ft | unknown | LIMESTONE BEDROCK |
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Agency Montana Bureau of Mines and Geology Site Name MBMG-62261 Site Number 62261 Site Type WELL Lat/Long (NAD83) 46.5821, -112.018 Well Depth 140 Feet Elevation (NGVD29) 4190.0 ft Latitude 46.58213419 Longitude -112.01803 Local Aquifer Name 400HELN, HELENA DOLOMITE (None) National Aquifer Name Northern Rocky Mountains Intermontane Basins aquifer systems (S100NRMTIB) 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 48.43 40.81 19.86 1993-11-09 2025-12-31 314 32.1 31.10 90.91 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 44.60 44.30 43.15 42.22 41.62 32.80 19.86 28 28 Feb 46.27 45.76 44.31 42.62 41.83 37.80 25.61 24 24 Mar 46.82 45.39 44.77 42.80 41.40 32.66 24.47 25 25 Apr 48.43 44.77 43.92 42.15 40.40 28.91 21.08 25 25 May 45.41 45.18 43.48 41.83 40.17 33.53 21.97 23 23 Jun 43.23 41.77 40.25 39.40 37.52 31.58 24.45 25 25 Jul 43.60 42.65 40.48 39.06 37.70 31.68 26.95 27 27 Aug 42.60 41.77 40.46 39.69 37.09 34.76 29.60 24 24 Sep 42.65 41.78 40.87 39.55 37.67 33.19 24.38 25 25 Oct 42.58 41.91 40.84 39.62 38.97 28.90 22.00 25 25 Nov 43.25 42.36 41.49 40.32 38.81 34.16 21.00 29 29 Dec 43.55 42.64 41.95 41.05 40.69 32.26 20.50 21 21 Statistics Calculated 2026-05-15 -
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