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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
421633088125801 44N9E-20.7c (Island Lake)
Sand and gravel aquifers (glaciated regions)
Quaternary System
Quaternary System
LOCATION - Lat 42°16'33.9", long 88°12'58.8" referenced to North American Datum of 1983, in SE 1/4 NW 1/4 SW 1/4 sec.20, T.44 N., R.9 E., McHenry County, IL, Hydrologic Unit 07120006, near Island Lake. Owner: U.S. Geological Survey.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 26.1 ft. Upper casing diameter 2 in; top of first opening 21.1 ft, bottom of last opening 26.1 ft.
DATUM - Land-surface datum is 750 ft above National Geodetic Vertical Datum of 1929. Measuring point: 2-INCH PVC FLUSH-MOUNT, 0.33 ft below land-surface datum, Oct. 20, 1999 to present.
PERIOD OF RECORD -
GROUND-WATER
GROUND WATER LEVELS: March 2013 to April 2017.
MISCELLANEOUS WATER LEVELS: June 2005, 2011, 2012.
WATER QUALITY
CHEMICAL: April 2000, June 2002, June 2005, 2011, 2012.
WATER TEMPERATURE: November 2010 to April 2016.
SPECIFIC CONDUCTANCE: November 2010 to April 2016.
GROUND-WATER
GROUND WATER LEVELS: March 2013 to April 2017.
MISCELLANEOUS WATER LEVELS: June 2005, 2011, 2012.
WATER QUALITY
CHEMICAL: April 2000, June 2002, June 2005, 2011, 2012.
WATER TEMPERATURE: November 2010 to April 2016.
SPECIFIC CONDUCTANCE: November 2010 to April 2016.
GAGE - Water-level/water-quality recorder and phone telemeter.
REMARKS - Accuracy of records is discussed in the annual Station Analysis archived at the USGS IL Water Science Center.
EXTREMES FOR PERIOD OF RECORD -
GROUND-WATER LEVELS: Highest water level, 10.59 ft. below land-surface datum, April 6, 2017; lowest, 15.51 ft. below land-surface datum, October 9, 2012.
WATER TEMPERATURE: Maximum, 14.4oC, Many days in 2012.; Minimum, 11.4 oC, June 3, 2015.
SPECIFIC CONDUCTANCE: Maximum, 7,100 uS/cm at 25oC, August 18-20, 2014; Minimum, 2,460 uS/cm at 25oC, April 13, 2015.
GROUND-WATER LEVELS: Highest water level, 10.59 ft. below land-surface datum, April 6, 2017; lowest, 15.51 ft. below land-surface datum, October 9, 2012.
WATER TEMPERATURE: Maximum, 14.4oC, Many days in 2012.; Minimum, 11.4 oC, June 3, 2015.
SPECIFIC CONDUCTANCE: Maximum, 7,100 uS/cm at 25oC, August 18-20, 2014; Minimum, 2,460 uS/cm at 25oC, April 13, 2015.
