MBMG-256854
Montana Bureau of Mines and Geology
Located in Madison 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 | |
|---|---|---|
| -2.5-443.0 ft | 6.0 in diameter a53b steel casing | |
| 436.0-446.0 ft | 5.0 in diameter screen-continuous-stainless screen |
| Depth | Lithology | Description |
|---|---|---|
| 0.0-2.0 ft | unknown | TOP SOIL, BROWN |
| 2.0-42.0 ft | unknown | SAND, MEDIUM TO FINE, AND MEDIUM TO COARSE GRAVEL. PEBBLES ROUNDED TO SUB ROUNDED. BROWN TO LIGHT GREY. IN GRAVEL PIT CUT CAN SEE MATRIX SUPPORTED COBBLES. |
| 42.0-53.0 ft | unknown | SAND, FINE TO MEDIUM WITH SOME SILT, BROWN. |
| 53.0-55.0 ft | unknown | CLAY AND FINE SAND, LIGHT BROWN, WITH SOME SILT. |
| 55.0-75.0 ft | unknown | CLAY, GREENISH-BROWN WITH SOME SILT. |
| 75.0-87.0 ft | unknown | SAND, FINE GRAINED, WITH SOME SILT, BROWN. |
| 87.0-93.0 ft | unknown | SAND, FINE AND CLAY, BROWN. |
| 93.0-98.0 ft | unknown | CLAY, GREENISH-GREY (DISTINCT COLOR CHANGE). STARTING TO SHOW WATER AT 95 FEET. |
| 98.0-100.0 ft | unknown | SAND, FINE, AND CLAY, BROWN. |
| 100.0-132.0 ft | unknown | SAND, FINE WITH SOME SILT. |
| 132.0-135.0 ft | unknown | CLAY, GREY, SOME FINE SAND. |
| 135.0-174.0 ft | unknown | SAND, FINE, WITH SOME SILT, BROWN. |
| 174.0-193.0 ft | unknown | CLAY, GREY, WITH SOME FINE SAND AND SILT. |
| 193.0-195.0 ft | unknown | CLAY, LIGHT BROWN-TAN. (COLOR CHANGE) HEAVING SAND AT 195 FEET, HALF SAND, HALF WATER. |
| 195.0-208.0 ft | unknown | SAND, FINE TO MEDIUM, BROWN. |
| 208.0-214.0 ft | unknown | CLAY, TAN, WITH SOME FINE SAND AND SILT. |
| 214.0-219.0 ft | unknown | SAND, FINE AND SILT, BROWN. |
| 219.0-234.0 ft | unknown | CLAY, GREY, WITH SOME FINE SAND AND SILT. |
| 234.0-255.0 ft | unknown | SAND, FINE WITH SOME SILT, BROWN. HEAVING, 30 GPM BETWEEN 240 AND 250 FEET. |
| 255.0-268.0 ft | unknown | CLAY, TAN TO LIGHT BROWN, WITH FINE SAND AND SILT. 20 GPM AT 255 FEET. |
| 268.0-280.0 ft | unknown | SAND, FINE WITH SOME SILT, BROWN. 60+ GPM AT 268 FEET. |
| 280.0-290.0 ft | unknown | SAND, FINE AND SILT AND CLAY, LIGHT BROWN. NOT MUCH WATER BETWEEN 280 AND 310 FEET. |
| 290.0-305.0 ft | unknown | CLAY, TAN, WITH SOME FINE SAND AND SILT. |
| 305.0-308.0 ft | unknown | SAND, FINE WITH SOME SILT, BROWN. |
| 308.0-315.0 ft | unknown | CLAY, GREY, WITH SOME FINE SILT. 30 GPM AT 315 FEET. |
| 315.0-318.0 ft | unknown | SAND, FINE TO MEDIUM, ORANGISH-BROWN. |
| 318.0-323.0 ft | unknown | CLAY, TAN, WITH SOME FINE SAND AND SILT. |
| 323.0-330.0 ft | unknown | SAND, FINE WITH A LITTLE MEDIUM COARSE, BROWN. |
| 330.0-348.0 ft | unknown | SAND, FINE WITH SOME SILT, BROWN. NO WATER AT 335 FEET. 60 GPM AT 341 FEET. |
| 348.0-374.0 ft | unknown | CLAY, TAN, WITH SOME FINE SAND AND SILT. |
| 374.0-379.0 ft | unknown | SAND, FINE, BROWN. SOME MEDIUM TO COARSE SAND AROUND 376 - 379 |
| 379.0-386.0 ft | unknown | CLAY, TAN, WITH SOME FINE SAND AND SILT. |
| 386.0-387.0 ft | unknown | SAND, FINE WITH SILT, BROWN. |
| 387.0-391.0 ft | unknown | CLAY, TAN, WITH SOME FINE SAND AND SILT. |
| 391.0-408.0 ft | unknown | SAND, FINE, SOME SILT, BROWN. HEAVING |
| 408.0-415.0 ft | unknown | CLAY, TAN, WITH SOME FINE SAND AND SILT. |
| 415.0-435.0 ft | unknown | CLAY, GREY, AND CLAY BOUND COARSE SAND AND GRAVEL. 60 GPM AT 417 FEET. NO WATER AT 424 FEET. |
| 435.0-445.0 ft | unknown | SAND, FINE, BROWN, WITH SOME MEDIUM TO COARSE SAND. WOOD FRAGMENTS, GREENISH-YELLOW COLORED. |
| 445.0-446.0 ft | unknown | CLAY, GREY. |
-
Agency Montana Bureau of Mines and Geology Site Name MBMG-256854 Site Number 256854 Site Type WELL Lat/Long (NAD83) 45.3932, -111.7301 Well Depth 446 Feet Elevation (NAVD88) 4941.299 ft Latitude 45.39320236 Longitude -111.7300791 Local Aquifer Name 120SNGR SAND AND GRAVEL (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 -
-
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 92.48 90.26 87.48 2010-08-02 2025-12-15 5051 15.3 91.33 0.0 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 90.70 90.35 89.58 89.38 89.00 87.78 87.77 15 15 Feb 90.60 90.44 89.96 89.75 89.46 89.07 89.06 15 15 Mar 91.23 91.14 90.86 90.32 89.84 89.19 88.89 15 15 Apr 91.87 91.84 91.55 91.09 90.92 90.33 90.26 14 14 May 92.16 92.11 91.93 91.59 91.28 91.13 91.11 14 14 Jun 92.35 92.13 91.76 91.50 90.98 89.96 89.88 15 15 Jul 92.17 92.03 91.60 91.04 89.89 89.71 89.71 14 14 Aug 91.96 91.66 91.14 90.80 89.70 89.41 89.25 15 15 Sep 91.72 91.31 90.78 90.20 89.34 88.84 88.62 15 15 Oct 91.37 90.83 90.32 89.87 89.27 88.54 88.29 16 16 Nov 91.43 90.91 90.13 89.73 89.21 88.45 88.33 15 15 Dec 91.37 90.94 90.06 89.70 88.82 88.49 88.01 16 16 Statistics Calculated 2026-05-16 -
Operated in cooperation with:
