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USGS Water-Year Summary 2023
374453088261701 9S7E-9.4a (SE Illinois College)
Sand and gravel aquifers (glaciated regions)
Quaternary System
Quaternary System
LOCATION - Lat 37°44'53.5", long 88°26'17.0" referenced to North American Datum of 1983, in SW 1/4 SW 1/4 SE 1/4 sec.9, T.9 S., R.7 E., Saline County, IL, Hydrologic Unit 05140204,
REVISIONS HISTORY - Revisions: Land-surface datum was revised to 373.36 ft NAVD88 on Dec. 21, 2023, as determined by third order differential levels. Land-surface datum was previously published as 380 ft NGVD29 (380.32 ft NAVD88) from topographic map. Discrete water-level measurements referenced to NGVD29 and NAVD88 were revised, based on changes to the land-surface datum.
Revisions: Water levels below land-surface datum and associated discrete water-level measurements prior to Aug. 22, 2023, were revised on Dec. 21, 2023, due to an incorrect measuring point (MP) height. Previous MP was 1.87 ft above land-surface datum (LSD). New corrected MP height is 2.11 ft above LSD.
Revisions: Water levels below land-surface datum and associated discrete water-level measurements prior to Aug. 22, 2023, were revised on Dec. 21, 2023, due to an incorrect measuring point (MP) height. Previous MP was 1.87 ft above land-surface datum (LSD). New corrected MP height is 2.11 ft above LSD.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 11 ft. Upper casing diameter 6 in; top of first opening 8 ft, bottom of last opening 11 ft.
DATUM - Land-surface datum is 373.59 ft above North American Vertical Datum of 1988. Measuring point: Platform, on south side. USGS measured 1.85 ft on 10/26/12, prior to that assummed 1 ft, 2.0 ft above land-surface datum, Aug. 7, 1984 to May. 1, 2013; Platform, on south side. USGS measured 1.85 ft on 10/26/12, prior to that assummed 1 ft, 382.0 ft above land-surface datum, Aug. 7, 1984 to May. 1, 2013; North side of access hole inside security box mounted above well on culvert, 1.87 ft above land-surface datum, Apr. 30, 2013 to present; North side of access hole inside security box mounted above well on culvert, 375.46 ft above land-surface datum, Apr. 30, 2013 to present.
PERIOD OF RECORD -
GROUND-WATER LEVELS:
January 1984 to April 2013 (period measurements), April 2013 to current (continuous record).
GAGE - Water level recorder and satellite telemeter.
EXTREMES FOR PERIOD OF RECORD -
EXTREMES FOR PERIOD OF RECORD:
Highest water level, -0.21 ft. below land-surface datum, March 24, 2023; lowest, 10.09 ft. below land-surface datum, Nov. 2, 2017.
EXTREMES OUTSIDE PERIOD OF CONTINUOUS RECORD:
Highest water level, 0.04 ft. below land-surface datum, measured Apr. 26, 2011, in cooperation with the Illinois State Water Survey; lowest water level, 10.86 ft below land-surface datum, measured Dec. 29, 1999. in cooperation with the Illinois State Water Survey.
