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USGS Water-Year Summary 2024
331438092411901 17S15W18DBB1
Mississippi embayment aquifer system
Sparta Sand
Sparta Sand
LOCATION - Lat 33°14'38.96", long 92°41'29.21" referenced to North American Datum of 1983, in NW 1/4 NW 1/4 SE 1/4 sec.18, T.17 S., R.15 W., Union County, AR, Hydrologic Unit 08040201, and at El Dorado.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 540 ft. Upper casing diameter 6 in; top of first opening 516 ft, bottom of last opening 536 ft.
DATUM - Land-surface datum is 182.23 ft above North American Vertical Datum of 1988. Measuring point: Top of casing, 2.0 ft above land-surface datum, Jan. 1, 1942 to Oct. 17, 2006; Top of casing, 1.9 ft above land-surface datum, Jul. 22, 2008 to present. As of October 2024, The LSD is 182.23 ft above NAVD 88. MP: The top of well is 1.36 ft above LSD. TBM elevation was established via GNSS survey GPS base unit.
PERIOD OF RECORD - Annual 1942, 1943, 1947, 1950, 1964 to 1969, monthly Oct 1969 to Sep 1975, Oct 1990 to Sep 1992, Feb 1993 to Jul 2003, and continuous Oct 1954 to Sep 1963, Oct 1975 to Sep 1990, Oct 1992 to Jan 1993, and Jul 2003 to current year.
GAGE -
Land Surface Datum of Well is 182.23 ft above NAVD of 1988, (Reference Frame NAD_83 (2011) (EPOCH:2010.0000) GEOID18), tape up to MP = 1.36 ft
Prior to October 2024, the LSD of Well was 182.93 ft NGVD of 1929, tape up to MP = 1.9 ft
Prior to July 2008, the LSD of Well was 182.93 ft above NGVD of 1929, tape up to MP = 2.0 ft
COOPERATION - Union County Water Conservation Board.
EXTREMES FOR PERIOD OF RECORD - Highest water level, 122.00 ft below land surface datum, Jun 30, 1942; lowest water level, 381.37 ft below land surface datum, Apr 29, 1993.
