USGS Water-Year Summary 2023
421626088311402 11-SEN-D
Sand and gravel aquifers (glaciated regions)
Quaternary System
LOCATION - Lat 42°16'26", long 88°31'14" referenced to North American Datum of 1983, in SW 1/4 NW 1/4 SE 1/4 sec.22, T.44 N., R.6 E., McHenry County, IL, Hydrologic Unit 07090006, 42 feet from northwest corner of steel building, 61 feet east of Garden Valley Road, 1.3 miles north of Route 176, 0.2 miles northwest of Franklinville Creek, 0.5 miles southwest of Franklinville. and 4.8 miles northeast of Marengo. Owner: McHenry County.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 153.2 ft. Upper casing diameter 2 in; top of first opening 148.2 ft, bottom of last opening 152.7 ft. Well-casing includes schedule 40 PVC pipe, 6 in. diameter borehole with bentonite seal, observation well.
DATUM - Land-surface datum is 830.63 ft above North American Vertical Datum of 1988. Measuring point: Top of PVC casing; High point marked, 2.10 ft above land-surface datum, Oct. 22, 2008 to present.
PERIOD OF RECORD -
GROUND-WATER LEVELS: February 2009 to November 2016.
GROUND-WATER QUALITY:
CHEMICAL: Water year 2011.
GAGE - Water level recorder and radio telemeter.
EXTREMES FOR PERIOD OF RECORD - Highest water level, 1.49 ft below land-surface datum, April 18, 2012; lowest, 7.41 ft below land-surface datum, October 9, 2012.