MBMG-131579
Montana Bureau of Mines and Geology
Located in Silver Bow 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 | |
|---|---|---|
| 0.0-411.0 ft | 8.0 in diameter steel casing |
| Depth | Lithology | Description |
|---|---|---|
| 0.0-20.0 ft | unknown | MEDIUM COARSE SAND (OLIVE) |
| 20.0-30.0 ft | unknown | COARSE SAND & PEBBLES (BROWN GRAY) |
| 30.0-60.0 ft | unknown | PEBBLES TO MED SAND (GRADING DOWN) |
| 60.0-62.0 ft | unknown | SANDY SILT |
| 62.0-62.5 ft | unknown | GRAVEL |
| 62.5-74.0 ft | unknown | SANDY SILT |
| 74.0-82.0 ft | unknown | GRAVEL W/ COARSE SAND AND SILT |
| 82.0-112.0 ft | unknown | SANDY SILT W/ CLAY |
| 112.0-114.0 ft | unknown | SANDY GRAVEL |
| 114.0-119.0 ft | unknown | SANDY SILT |
| 119.0-120.0 ft | unknown | COARSE SANDS AND GRAVELS |
| 120.0-161.0 ft | unknown | LIGHT BROWN COARSE SANDY SILT W/ PEBBLES & MICA |
| 161.0-162.0 ft | unknown | SANDY GRAVEL |
| 162.0-165.0 ft | unknown | LIGHT BROWN COARSE SANDY SILT W/ PEBBLES |
| 165.0-195.0 ft | unknown | LIGHT BROWN FINE SANDY SILT |
| 195.0-345.0 ft | unknown | LIGHT BROWN COARSE SANDY SILT W/ SUB ROUNDED PEBBLES |
| 345.0-375.0 ft | unknown | LIGHT BROWN SILTY COARSE SUBROUNDED SAND |
| 375.0-410.0 ft | unknown | LIGHT TO MED BROWN COARSE SUBROUNDED SANDY SILT |
| 410.0-443.0 ft | unknown | TAN TO BROWN COARSE SUBROUNDED SANDY SILT W/ SOME SUBROUNDED PEBBLES @ TOP GRADING DOWN TO NO PEBBLES NEAR BOTTOM |
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Agency Montana Bureau of Mines and Geology Site Name MBMG-131579 Site Number 131579 Site Type WELL Lat/Long (NAD83) 45.9883, -112.6694 Well Depth 411 Feet Elevation (NGVD29) 5391.0 ft Latitude 45.9883257 Longitude -112.6693621 Local Aquifer Name 120SDMS, SEDIMENTS (TERTIARY) (None) National Aquifer Name Northern Rocky Mountains Intermontane Basins aquifer systems (S100NRMTIB) 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 59.14 56.45 54.51 1993-03-09 2026-04-21 6219 33.1 54.95 90.00 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 58.86 58.36 57.47 56.58 56.16 55.73 54.95 18 18 Feb 58.53 58.33 57.66 56.81 56.15 56.01 55.96 19 19 Mar 58.97 58.33 57.71 56.72 56.10 55.88 55.27 31 31 Apr 58.52 58.23 57.74 56.62 56.16 54.95 54.85 19 19 May 58.17 58.12 57.73 56.54 56.15 55.73 55.26 19 19 Jun 58.57 57.77 57.30 56.38 55.89 55.20 54.56 29 29 Jul 58.07 57.78 57.31 56.58 55.90 55.62 55.24 17 17 Aug 58.16 57.81 57.14 56.25 55.85 55.20 54.55 18 18 Sep 58.40 57.84 57.17 56.18 55.76 54.96 54.51 31 31 Oct 58.64 58.21 57.08 56.24 55.89 55.41 54.69 21 21 Nov 58.84 58.17 57.01 56.35 56.02 55.67 55.46 19 19 Dec 59.00 57.99 57.32 56.45 56.03 55.61 54.74 29 29 Statistics Calculated 2026-05-16 -
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