LOCATION.-- Lat 41°55'58", long 88°20'28" (NAD of 1927), in NE1/4SE1/4 sec.20, T.40 N., R.8 E., Kane County, Hydrologic Unit 07120007, on right bank at downstream side of bridge on Randall Road, 2.4 mi northwest of St. Charles, and at mile 2.2.

DRAINAGE AREA.-- 51.7 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: December 1960 to current year.

STAGE: Water years 1994 to current year.

SURFACE-WATER QUALITY

MISCELLANEOUS: Water year 2000; contaminants in streambed sediments, water year 2000.

PRECIPITATION: August 2000 to current year.

BIOLOGICAL

ALGAE: Pigment and biomass, Water year 2000.

BENTHIC MACROINVERTEBRATES: Water year 2000.

HABITAT: Water year 2000.

REVISED RECORDS.-- WDR IL-75-1: Drainage area. WDR IL-82-2: 1966(M), 1968(M), 1970-71(M), 1973(M), 1978-79(M).

GAGE.-- Water-stage recorder, phone telemeter, crest-stage gage, and rain gage. Datum of gage is 704.84 ft above NGVD of 1929.

REMARKS.-- Collection, computation and publication of precipitation data do not necessarily conform to standards used by the National Weather Service. Precipitation data could be subject to error for days with freezing and/or thawing of precipitation.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 2,580, Feb. 21, 1997, from rating curve extended above 1,960 ft³/s, gage height, 8.77 ft; maximum gage height, 9.66 ft, Feb. 8, 1965, from floodmark, ice jam; minimum discharge, 0.10 ft³/s, several days in 1961 and 1965.

PRECIPITATION: Maximum recorded daily total, 3.27 in., August 13, 2002.