USGS Water-Year Summary 2019
440326103180702 ZZZZ 1N 7E 8DBCC2
Madison Group (Upper and Lower Mississippian)
LOCATION - Lat 44°03'26", long 103°18'07" referenced to North American Datum of 1927, Pennington County, SD, Hydrologic Unit 10120110, -Lat. 44 03'26", -Long 103 18'07" in SW1/4 NW1/4 SE1/4, sec 8 T.1N., R.7E., Pennington County, Hydrologic Unit 10120110, in Rapid City
WELL CHARACTERISTICS - Depth 640 ft. Upper casing diameter undefined; top of first opening undefined, bottom of last opening undefined. Drilled unused production well 640 ft deep
DATUM - Land-surface datum is 3,380 ft above National Geodetic Vertical Datum of 1929. Measuring point: 1.95ft from measuring point to land surface, 1.95 ft above land-surface datum, Oct. 1, 2017 to present.
PERIOD OF RECORD - Oct. 1999 to current year. Records from Oct. 1999 to Sept. 2012 are unpublished and available in the files of the Geological Survey.
GAGE - Satellite data collection platform and pressure transducer, 60 minute recording interval.
EXTREMES FOR PERIOD OF RECORD - Highest water level -43.22 ft, June 29, 2015, lowest water level -10.57 ft, April 5-6, 2008.