MBMG-191548
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 | |
|---|---|---|
| 0.0-136.0 ft | 4.0 in diameter pvc casing | |
| 126.0-136.0 ft | 4.0 in diameter screen-pvc screen |
| Depth | Lithology | Description |
|---|---|---|
| 0.0-10.0 ft | unknown | ROUGH DRILLING BLACK COBBLES WITH SAND |
| 10.0-12.0 ft | unknown | SMOOTH DRILLING SAND |
| 12.0-20.0 ft | unknown | BLACK VOLCANIC COBBLES AND GRAVEL WITH COARSE SAND |
| 20.0-35.0 ft | unknown | GRAVEL WITH ABOUT 5 PERCENT FINE SAND SILT |
| 35.0-38.0 ft | unknown | SAND SILT CLAY SMOOTH DRILLING |
| 38.0-40.0 ft | unknown | GRAVEL SAND ROUGH DRILLING |
| 40.0-60.0 ft | unknown | SAND WITH GRAVEL CLAY |
| 60.0-66.0 ft | unknown | CLAY SLOW SMOOTH DRILLING |
| 66.0-67.0 ft | unknown | ROUGH DRILLING GRAVEL COARSE SAND |
| 67.0-80.0 ft | unknown | SMOOTH FAST DRILLING COARSE SAND WITH SILT CLAY |
| 80.0-85.0 ft | unknown | SILT AND CLAY |
| 85.0-90.0 ft | unknown | ROUGH DRILLING SILTY SANDY GRAVEL |
| 90.0-105.0 ft | unknown | SILT CLAY |
| 105.0-130.0 ft | unknown | GRAVEL ROUGH DRILLING |
| 130.0-136.0 ft | unknown | SILT CLAY SLOW SMOOTH DRILLING |
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Agency Montana Bureau of Mines and Geology Site Name MBMG-191548 Site Number 191548 Site Type WELL Lat/Long (NAD83) 46.5916, -111.8778 Well Depth 136 Feet Elevation (NGVD29) 3920.0 ft Latitude 46.59163465 Longitude -111.8778217 Local Aquifer Name 120SDMS SEDIMENTS (TERTIARY) (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 120.84 115.21 110.44 2001-12-07 2026-01-28 242 24.1 114.59 47.059 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 117.16 116.90 116.00 114.49 113.54 112.48 111.97 16 16 Feb 117.68 116.89 115.30 114.10 113.50 112.04 111.67 17 17 Mar 117.52 116.60 115.66 113.99 113.24 111.95 111.56 19 19 Apr 117.81 117.34 115.73 113.91 113.15 111.88 111.12 20 20 May 117.50 117.05 116.29 114.36 113.09 111.49 110.44 20 20 Jun 118.95 117.99 115.90 114.94 112.99 111.97 111.72 22 22 Jul 119.81 119.14 117.01 115.65 114.69 113.08 111.99 21 21 Aug 120.44 119.44 117.18 116.19 115.29 113.39 113.14 20 20 Sep 120.56 120.15 118.69 116.86 115.74 115.27 113.76 19 19 Oct 119.82 119.69 117.60 116.43 115.06 114.64 113.30 17 17 Nov 118.79 118.19 116.69 115.29 114.53 112.98 112.88 19 19 Dec 119.00 118.62 116.22 114.99 114.00 112.79 112.44 19 19 Statistics Calculated 2026-05-15 -
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