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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
421653088370901 MARN-09-02
Sand and gravel aquifers (glaciated regions)
Quaternary System
Quaternary System
LOCATION - Lat 42°16'52.96", long 88°37'09.29" referenced to North American Datum of 1983, in SE 1/4 NE 1/4 NW 1/4 sec.23, T.44 N., R.5 E., McHenry County, IL, Hydrologic Unit 07090006, 26 feet east of groundwater well MARN-10-04 (421653088370903), 49 feet southwest of River Road, 240 feet west of intersection of River Road and Elizabeth Street, 0.5 miles west of Route 23, 0.3 miles east of Tributary to Kishwaukee River, 1.0 mile north of Kishwaukee River, and 2.3 miles northwest of Marengo. Owner: Illinois State Geological Survey.
REVISIONS HISTORY - Revisions: Land-surface datum was updated to 828.52 ft NAVD88 on May 30, 2023, as determined by a GNSS Level II survey. Land-surface datum was previously published as 827 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 110.6 ft. Upper casing diameter undefined; top of first opening 105.3 ft, bottom of last opening 110.3 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 828.52 ft above North American Vertical Datum of 1988. Measuring point: File mark on top west side of PVC well casing, 2.82 ft above land-surface datum, Jul. 16, 2009 to present; File mark on top west side of PVC well casing, 829.82 ft above land-surface datum, Jul. 16, 2009 to present.
PERIOD OF RECORD -
GROUND-WATER LEVELS: September 2009 to current. 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. 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, 13.28 ft below land-surface datum, May 31, 2019; lowest, 22.92 ft below land-surface datum, January 8, 2013.
