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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.
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USGS Water-Year Summary 2024
421145088194801 17-ALG-S
Sand and gravel aquifers (glaciated regions)
Quaternary System
Quaternary System
LOCATION - Lat 42°11'45", long 88°19'48" referenced to North American Datum of 1983, in NW 1/4 NE 1/4 NW 1/4 sec.20, T.43 N., R.8 E., McHenry County, IL, Hydrologic Unit 07120006, about 1 mile north of Lake in the Hills, in Lake in the Hills Fen Park, 15 feet east of Jefferson Street, and 20 feet south of trail going east. Owner: McHenry County.
REVISIONS HISTORY - Revisions: Land-surface datum was updated to 879.95 ft NAVD88 on May 30, 2023, as determined by a GNSS Level II survey. Land-surface datum was previously published as 880.03 ft NAVD88 (furnished). Discrete water-level measurements prior to May 30, 2023, are referenced to the original datum.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 47.3 ft. Upper casing diameter 2 in; top of first opening 42.3 ft, bottom of last opening 46.8 ft. Well casing includes schedule 40 PVC pipe, 8 in. diameter borehole with bentonite seal, observation well, artesian with packer.
DATUM - Land-surface datum is 879.95 ft above North American Vertical Datum of 1988. Measuring point: Top of PVC Casing; High point marked, 2.45 ft above land-surface datum, Oct. 17, 2008 to present; Top of PVC Casing; High point marked, 882.48 ft above land-surface datum, Oct. 17, 2008 to present.
PERIOD OF RECORD -
GROUND-WATER LEVELS: October 2010 to current. Prior to October 2010 (periodic).
GROUND-WATER QUALITY:
CHEMICAL: Water year 2010.
GROUND-WATER LEVELS: October 2010 to current. Prior to October 2010 (periodic).
GROUND-WATER QUALITY:
CHEMICAL: Water year 2010.
GAGE - Water level recorder and satellite telemeter.
EXTREMES FOR PERIOD OF RECORD - Highest water level, -4.13 ft below land-surface datum, July 22, 2017; lowest, 6.90 ft below land-surface datum, October 12, 13, 2012.
