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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
422032088222001 MHEN-08-01
Sand and gravel aquifers (glaciated regions)
Quaternary System
Quaternary System
LOCATION - Lat 42°20'32.41", long 88°22'20.47" referenced to North American Datum of 1983, in SE 1/4 SW 1/4 SW 1/4 sec.25, T.45 N., R.7 E., McHenry County, IL, Hydrologic Unit 07120006, Located on McHenry County Conservation District property, 21 feet west of gravel road, 0.1 mile east of Cold Springs Road, 0.2 miles south of Thompson Road, 1.7 miles northwest of the town of Bull Valley, 2.9 miles south of the town of Wonder Lake, 0.5 miles northwest from Boone Creek and the headwaters of Wold Lake. Owner: Illinois State Geological Survey.
REVISIONS HISTORY - Revisions: Land-surface datum was updated to 862.82 ft NAVD88 on May 30, 2023, as determined by a GNSS Level II survey. Land-surface datum was previously published as 860 ft NAVD88 from LiDAR (furnished). Discrete water-level measurements prior to May 30, 2023, are referenced to the original datum.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 103.3 ft. Upper casing diameter undefined; top of first opening 98 ft, bottom of last opening 103 ft. Well-casing includes 2-inch schedule 40 PVC pipe, 5.5 in. diameter borehole sealed with benseal grout, observation well.
DATUM - Land-surface datum is 862.82 ft above North American Vertical Datum of 1988. Measuring point: Top of PVC Casing; High Point Marked, 2.13 ft above land-surface datum, Sep. 24, 2008 to present; Top of PVC Casing; High Point Marked, 862.13 ft above land-surface datum, Sep. 24, 2008 to present.
PERIOD OF RECORD -
GROUND-WATER LEVELS: September 2009 to current year. Prior to September 2009,
observation well readings available from the Illinois State Geological Survey.
GROUND-WATER QUALITY:
CHEMICAL: Water year 2011.
GROUND-WATER LEVELS: September 2009 to current year. Prior to September 2009,
observation well readings available from the Illinois State Geological Survey.
GROUND-WATER QUALITY:
CHEMICAL: Water year 2011.
GAGE - Water level recorder and satellite telemeter.
EXTREMES FOR PERIOD OF RECORD - Highest water level, 31.13 ft. below land-surface datum, May 27, 2020; lowest, 36.17 ft. below land-surface datum, January 28, 2013.
