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USGS Water-Year Summary 2024
05439000 SOUTH BRANCH KISHWAUKEE RIVER AT DE KALB, IL
LOCATION - Lat 41°55'52", long 88°45'35" referenced to North American Datum of 1983, in SW 1/4 NE 1/4 sec.22, T.40 N., R.4 E., DeKalb County, IL, Hydrologic Unit 07090006, on left bank, 100 ft downstream from bridge on State Highway 38 in De Kalb, and at mile 48.5.
DRAINAGE AREA - 77.7 mi².
REVISIONS HISTORY -
WDR IL-80-1: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: July 1925 to October 1933, October 1979 to current.
STAGE: Water years 1995 to current.
SURFACE-WATER QUALITY
SEDIMENT: October 1979 to September 1981.
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: July 1925 to October 1933, October 1979 to current.
STAGE: Water years 1995 to current.
SURFACE-WATER QUALITY
SEDIMENT: October 1979 to September 1981.
GAGE - Water-stage recorder, cellular telemeter, and crest-stage gage. Datum of gage is 831.82 ft. above NAVD88. Mar. 23, 1980 to Sept. 30, 1983, at datum 3.0 ft higher. Oct. 1, 1979 to Mar. 22, 1980, nonrecording gage at same site at datum 3.0 ft higher. Prior to Sept. 30, 1933, nonrecording gage at same site at datum 3.40 ft higher.
REMARKS - Accuracy of records is discussed in the annual Station Analysis archived at the USGS IL Water Science Center.
EXTREMES FOR PERIOD OF RECORD - SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 3,500 ft³/s, July 2, 1983, gage height, 15.80 ft; present datum; no flow, at times in most years.
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily mean, 1,650 mg/L June 13, 1981; minimum daily mean, 10 mg/L Mar. 9, 1980.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 3,070 tons, June 13, 1981; minimum daily, 0.04 ton, Oct. 15, 1979.
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily mean, 1,650 mg/L June 13, 1981; minimum daily mean, 10 mg/L Mar. 9, 1980.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 3,070 tons, June 13, 1981; minimum daily, 0.04 ton, Oct. 15, 1979.
