MBMG-248640
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 | |
|---|---|---|
| -2.0-69.4 ft | 2.0 in diameter pvc casing | |
| -2.0-2.0 ft | 6.0 in diameter steel casing | |
| 49.0-69.0 ft | 2.0 in diameter factory slotted screen |
| Depth | Lithology | Description |
|---|---|---|
| 0.0-5.0 ft | unknown | METAMORPHIC ROCK FRAGMENTS AND BUFF CLAY - DRY |
| 5.0-10.0 ft | unknown | METAMORPHIC ROCK FRAGMENTS ARE QUARTZITE AND GRAY-GREEN ARGILLITE. DRY |
| 10.0-15.0 ft | unknown | AS ABOVE - DRY |
| 15.0-20.0 ft | unknown | AS ABOVE - DRY. WELDED CASING SHOE ON 6-IN ID STEEL CASING. DRIVING 6-IN STEEL CASING. POURED SACKS POWDERED BENTONITE IN ANNULAR SPACE AT SURFACE |
| 20.0-25.0 ft | unknown | AS ABOVE (5 PERCENT BLACK ARGILLITE) - MORE PERCENTAGE ROCK FRAGMENTS. DRY. POSSIBLEY FROM UP HOLE |
| 25.0-30.0 ft | unknown | AS ABOVE. DRY. NO BLACK ARGILLITE |
| 30.0-35.0 ft | unknown | CLAY- GRAYISH GREEN WITH ROCK FRAGMENTS (ARGILLITE AND QUARTZITE). DRY. 50 PERCENT CLAY |
| 35.0-40.0 ft | unknown | AS ABOVE. GREY-GREEN ARGILLITE AND LIGHT COLORED CLAY. DRY |
| 40.0-45.0 ft | unknown | AS ABOVE. DRY |
| 45.0-50.0 ft | unknown | AS ABOVE. DRY. CLAY APPEARS KAOLINITIC. |
| 50.0-55.0 ft | unknown | AS ABOVE. UP TO 80 PERCENT CLAY. DRY |
| 55.0-60.0 ft | unknown | INCREASE IN ROCK FRAGMENTS. POSSIBLY CARBONATES. FINE GRAINED WITH IRON STAINING. DRY. CIRCULATING. SOME MINOR WATER ENTRY AT 60 FT BELOW LAND SURFACE. |
| 60.0-65.0 ft | unknown | CLAY AS ABOVE. 20-30 PERCENT ROCK FRAGMENTS. CIRCULATING. LIMITED WATER ENTRY. |
| 65.0-70.0 ft | unknown | DEEPENED TO 70 FT. LITHOLOGY AS ABOVE. 50-80 PERCENT CLAY WITH ROCK FRAGMENTS. CIRCULATING. GETTING STEADY INFLOW. WILL BUILD WELL WITH 20-FT OF 20 SLOT SCREEN FROM 50-70 FT BELOW LAND SURFACE. |
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Agency Montana Bureau of Mines and Geology Site Name MBMG-248640 Site Number 248640 Site Type WELL Lat/Long (NAD83) 46.6245, -112.1072 Well Depth 70 Feet Elevation (NGVD29) 4008.15 ft Latitude 46.62446 Longitude -112.10716 Local Aquifer Name 120SNGR, SAND AND GRAVEL (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 53.10 46.86 36.49 1995-05-19 2026-01-22 193 30.7 47.60 44.44 Statistics Calculated 2026-05-18 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 52.25 51.01 48.46 47.30 45.41 39.67 39.21 17 17 Feb 51.03 50.76 49.05 47.41 45.32 41.76 39.95 14 14 Mar 51.13 50.70 49.01 47.45 46.33 42.01 39.83 15 15 Apr 51.22 50.49 49.16 47.35 45.17 42.14 40.30 15 15 May 51.39 50.22 48.74 47.13 43.96 41.13 38.90 15 15 Jun 51.36 50.08 48.08 46.52 42.66 38.56 37.89 16 16 Jul 50.55 50.06 49.26 46.64 43.63 40.02 37.54 16 16 Aug 53.10 52.73 48.89 46.97 44.31 37.54 36.49 19 19 Sep 51.68 50.66 48.55 45.85 43.44 40.71 38.65 15 15 Oct 51.50 50.60 48.35 45.59 43.63 38.64 38.02 15 15 Nov 50.59 50.37 48.47 46.56 44.09 41.13 39.35 14 14 Dec 50.75 50.46 48.29 46.55 44.81 41.91 38.55 16 16 Statistics Calculated 2026-05-18 -
Operated in cooperation with:
