MBMG-151188
Montana Bureau of Mines and Geology
Located in Missoula 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 | |
|---|---|---|
| 0.0-35.0 ft | 6.0 in diameter steel casing | |
| 20.0-35.0 ft | 6.0 in diameter steel screen |
| Depth | Lithology | Description |
|---|---|---|
| 0.0-5.0 ft | unknown | SOIL: HUMIC -SANDY SOIL WITH COARSE SAND AND 5MM PEBBLES. |
| 5.0-10.0 ft | unknown | SAND: BUFF-COLORED -COARSER SAND- WITH SOME MICA FLAKES AND QUARTZ PEBBLES. PEBBLES UP TO 1.5CM. |
| 10.0-15.0 ft | unknown | SAND: COARSER SAND THAN @ 10'- 2-3CM PEBBLES - SOME GRANITE - WITH CHIPS - WITH COARSE SAND. |
| 15.0-20.0 ft | unknown | SAND: VERY COARSE SAND - LOTS OF QUARTZ SAND - MICA - QUARTZ AND SILTITE PEBBLES AS WELL AS GRANITE PEBBLES. HIT WATER AT 19' - EASY DRILLING - NO NEED TO DRIVE CASING. FROM 5' TO 20' VERY LITTLE FINES - ALL SANDS. |
| 20.0-25.0 ft | unknown | SAND: COARSE SAND WITH A FEW PEBBLES OF RED ARGILLITE. |
| 25.0-30.0 ft | unknown | SAND: COARSE SAND WITH A FEW PEBBLES OF RED AND GREEN ARGILLITE. |
| 30.0-35.0 ft | unknown | SAND: COARSE QUARTZ SAND WITH A FEW LARGE PEBBLES - TOOK 30 SECONDS TO DRILL FROM 20' TO 35' - ALL SAND. |
| 35.0-37.0 ft | unknown | SAND: COARSE SAND WITH LOTS OF LARGE (5CM) PEBBLES OF RED ARGILLITE AND QUARTZITE - A FEW MUD BALLS OR CLAY STREAKS AT 37' (MINOR CREAM TO TAN CLAY). |
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Agency Montana Bureau of Mines and Geology Site Name MBMG-151188 Site Number 151188 Site Type WELL Lat/Long (NAD83) 46.8485, -114.102 Well Depth 35 Feet Elevation (NAVD88) 3113.61 ft Latitude 46.84852325 Longitude -114.1020453 Local Aquifer Name 111ALVM ALLUVIUM (HOLOCENE) (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 10.15 8.46 2.96 1985-12-30 2025-11-03 1446 39.9 9.46 23.5 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 Feb 9.99 9.98 9.63 9.43 9.05 8.31 8.13 11 11 Mar 9.79 9.64 9.34 9.14 8.62 7.56 6.61 20 20 Apr 9.55 9.27 8.61 8.15 7.91 7.49 7.33 15 15 May 7.12 6.92 6.13 5.26 4.02 3.02 2.96 17 17 Jun 6.44 6.08 5.60 5.15 4.62 3.68 3.50 20 20 Jul 8.20 8.14 7.78 7.41 5.70 4.65 4.22 14 14 Aug 8.90 8.74 8.52 8.26 7.87 7.58 7.50 14 14 Sep 9.10 9.05 8.69 8.35 8.09 7.75 7.65 13 13 Oct 9.51 9.49 9.42 9.14 8.68 8.46 8.43 14 14 Nov 9.72 9.60 9.44 9.05 8.77 8.30 7.96 16 16 Dec 9.84 9.82 9.42 9.23 9.12 8.53 8.47 10 10 Statistics Calculated 2026-05-16 -
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