USGS Water-Year Summary 2023
05548030 NIPPERSINK CREEK NEAR GREENWOOD, IL
LOCATION - Lat 42°24'52", long 88°26'30" referenced to North American Datum of 1983, in SW 1/4 SW 1/4 SE 1/4 sec.32, T.46 N., R.7 E., McHenry County, IL, Hydrologic Unit 07120006, at bridge on Thayer Road, 1/4 mi west of intersection of Rte. 47 and Thayer Road, and at mile 25.8.
DRAINAGE AREA - 24.66 mi²,
SURFACE-WATER RECORDS
PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
 DISCHARGE: March 2011 to Nov 2014.
 STAGE: March 2011 to Nov 2014.
 PARTIAL RECORD: Annual maximum, water years 1965 - 1978.
GAGE - Water-stage recorder, crest-stage gage, and satellite telemeter. Datum of gage is 858.94 ft NAVD 1988. Prior to 2011, at site 0.6 mi downstream, at datum 862.55 ft NGVD of 1929.
EXTREMES FOR PERIOD OF RECORD - SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 526 ft³/s, April 18, 2013, gage height, 12.82 ft; no flow for many days in water year 2012 and several days in water year 2013.