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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2024
422308088231001 8-GRN-I
Sand and gravel aquifers (glaciated regions)
Quaternary System
Quaternary System
LOCATION - Lat 42°23'08", long 88°23'10" referenced to North American Datum of 1983, in SE 1/4 SE 1/4 SW 1/4 sec.11, T.45 N., R.7 E., McHenry County, IL, Hydrologic Unit 07120006, 80 feet north of Wondermere Road on McHenry County property, 0.3 mi. east of Greenwood Road, 0.2 mi. south of Nippersink Creek and 1.4 mi. west of Wonder Lake, and 0.5 mi. southeast of the City of Greenwood. Owner: McHenry County.
REVISIONS HISTORY - Revisions: Land-surface datum was updated to ft 856.06 NAVD88 on May 30, 2023, as determined by a GNSS Level II survey. Land-surface datum was previously published as 855.97 ft NAVD88 (furnished). Discrete water-level measurements prior to May 30, 2023, are referenced to the original datum.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 70.3 ft. Upper casing diameter undefined; top of first opening 65.3 ft, bottom of last opening 69.8 ft. Well-casing includes 2-inch schedule 40 PVC pipe, 8 in. diameter borehole with bentonite seal, observation well.
DATUM - Land-surface datum is 856.06 ft above North American Vertical Datum of 1988. Measuring point: Top of PVC casing; High point marked, 2.39 ft above land-surface datum, Sep. 23, 2008 to present.
PERIOD OF RECORD -
GROUND-WATER LEVELS: February 2009 to current.
GROUND-WATER QUALITY:
CHEMICAL: Water year 2011.
GROUND-WATER LEVELS: February 2009 to current.
GROUND-WATER QUALITY:
CHEMICAL: Water year 2011.
GAGE - Water level recorder and satellite telemeter.
EXTREMES FOR PERIOD OF RECORD - Highest water level, -0.73 ft. below land-surface datum, May 23, 2020; lowest, 9.46 ft below land-surface datum, January 24 and 26, 2013.
