USGS Water-Year Summary 2023
412249088015801 34N10E-36.6a (Midewin PZ9)
Sand and gravel aquifers (glaciated regions)
Quaternary System
LOCATION - Lat 41°22'49", long 88°01'58" referenced to North American Datum of 1983, in SW 1/4 SE 1/4 SW 1/4 sec.36, T.34 N., R.10 E., Will County, IL, Hydrologic Unit 07120001, Piezometer PZ9, about 4 miles southeast of Elwood. Owner: U.S. Forest Service, Midewin National Tallgrass Prairie.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 20.8 ft. Upper casing diameter undefined; top of first opening undefined, bottom of last opening undefined.
DATUM - Land-surface datum is 644.45 ft above North American Vertical Datum of 1988. Measuring point: TOP OF CASING, 3.85 ft above land-surface datum, Sep. 21, 2003, to present.
Land-surface datum is 644.40 ft above NAVD of 1988 (644.70 ft NGVD 1929). Measuring point:
Top of PVC casing, 3.9 ft above
land-surface datum.
PERIOD OF RECORD - GROUND-WATER LEVEL: 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, 0.05 ft below land surface datum, December 28, 2015.