USGS Water-Year Summary 2023
412053088101801 33N9E-14.8h (Midewin PZ3)
Sand and gravel aquifers (glaciated regions)
Quaternary System
LOCATION - Lat 41°20'53", long 88°10'18" referenced to North American Datum of 1983, in NW 1/4 NW 1/4 NW 1/4 sec.14, T.33 N., R.9 E., Will County, IL, Hydrologic Unit 07120001, Piezometer PZ3, about 3 miles northwest of Wilmington. Owner: U.S. Forest Service, Midewin National Tallgrass Prairie.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 11.7 ft. Upper casing diameter 1.0 in; top of first opening 6.7 ft, bottom of last opening 11.7 ft.
DATUM - Land-surface datum is 546.68 ft above North American Vertical Datum of 1988. Measuring point: TOP OF CASING, 3.3 ft above land-surface datum, Sep. 9, 2003, to present. Land-surface datum is 546.68 ft above NAVD of 1988 (546.97 ft NGVD 1929). Measuring
point: Top of PVC casing, 3.3 ft above land-surface datum.
PERIOD OF RECORD -
GROUND-WATER LEVELS: October 2003 through September 2004; September 2005 to current.
GAGE - Electronic data logger--60-minute recording.
EXTREMES FOR PERIOD OF RECORD - GROUND-WATER LEVELS:
Highest recorded water level, 0.27 ft above land surface datum, September 14, 2008.