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USGS Water-Year Summary 2024
331609093144902 17S21W11DCC2
Mississippi embayment aquifer system
Sparta Sand of Claiborne Group
Sparta Sand of Claiborne Group
LOCATION - Lat 33°16'08.55", long 93°14'48.61" referenced to North American Datum of 1983, in SW 1/4 SW 1/4 SE 1/4 sec.11, T.17 S., R.21 W., Columbia County, AR, Hydrologic Unit 11140203, and near Magnolia.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 428 ft. Upper casing diameter 8 in; top of first opening 365 ft, bottom of last opening 428 ft.
DATUM - Land-surface datum is 302.06 ft above North American Vertical Datum of 1988. Measuring point: Unknown, 1.3 ft above land-surface datum, Jan. 29, 1953 to Sep. 14, 2000; UCCD MP, 1.65 ft above land-surface datum, Nov. 19, 1996 to present; Hole in wooden cap orange plug removed, 1.66 ft above land-surface datum, Sep. 14, 2000 to present. As of October 2024, The LSD is 302.06 ft above NAVD 88 and was determined from a GNSS Level II static survey of reference mark, BM1 (310.67 ft) (Reference Frame NAD_83 (2011) (EPOCH:2010.0000) GEOID18), survey completed by USGS personnel. Levels were run from BM1 to the LSD. The MP was measured to be 2.06 ft above LSD.
PERIOD OF RECORD - Monthly from Jan 1953 to Oct 1960, periodic from Jan 1961 to Jul 2003, and continuous from Aug 2003 to current year.
GAGE -
Continuous transducer with modem telemetry. As of October 2024, The LSD is 302.06 ft above NAVD 88 (Reference Frame NAD_83 (2011) (EPOCH:2010.0000) GEOID18). MP = 2.06 ft above LSD.
Prior to 10/10/2024 the datum of well was 304 ft above NAVD88.
COOPERATION - Union County Water Conservation District.
EXTREMES FOR PERIOD OF RECORD - Highest water level, 238.11 ft below land surface datum, Apr 29, 1953; lowest water level, 354.39 ft below land surface datum, Sep 1, 1965.
