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USGS Water-Year Summary 2024
441759103261202 4N6E19AABA2
Paleozoic aquifers
Madison Group (Upper and Lower Mississippian)
Madison Group (Upper and Lower Mississippian)
LOCATION - Lat 44°17'59.7", long 103°26'12.2" referenced to North American Datum of 1983, in NW 1/4 NW 1/4 NE 1/4 sec.19, T.4 N., R.6 E., Meade County, SD, Hydrologic Unit 10120111, at Interstate 90 Tilford exit.
REVISIONS HISTORY - Revisions: Groundwater level measurements of June 3, 2019, July 17, 2019 and Oct. 15, 2019 were revised due to gage calibration error.
Revisions: June 19, 2020 to October 11, 2021, groundwater level measurements and corrections were revised due to incorrect resets of transducer and using the wrong MP.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 840 ft. Upper casing diameter 5 in; top of first opening 750 ft, bottom of last opening 840 ft.
DATUM - Land-surface datum is 3,639.1 ft above North American Vertical Datum of 1988. Measuring point: Top of steel casing, 2.2 ft above land-surface datum, Nov. 19, 1990 to Aug. 31, 1995; Base of gage, 4.1 ft above land-surface datum, Aug. 30, 1995 to Dec. 28, 2002; Top of steel casing, 4.0 ft above land-surface datum, Dec. 27, 2002 to Apr. 14, 2004; Top of steel casing, 3.2 ft above land-surface datum, Apr. 13, 2004 to Jun. 19, 2008; Top of steel casing, 3.2 ft above land-surface datum, Jun. 18, 2008 to present; top of fitting,, 4.06 ft above land-surface datum, Dec. 17, 2018 to present; Top of dial gage fitting, 3.54 ft above land-surface datum, Jun. 3, 2019 to present.
PERIOD OF RECORD - July 1991 to September 1998 published in Black Hills Hydrology Study, Open-File Reports 94-319, 96-399, and 00-70, October 2002 to current year. Records from October 1998 to September 2002 are unpublished and available in files of the U.S. Geological Survey.
GAGE - Satellite data-collection platform and submersible transducer, 60 minute recording interval.
EXTREMES FOR PERIOD OF RECORD - Highest water level, -34.38 ft below land-surface datum(pressure head), Jul. 06, 2015; lowest water level, 54.96 ft below land-surface datum, Mar. 31 and Apr. 1,3,7, 1993.
