LOCATION.-- Lat 41°00'32", long 87°49'24" (NAD of 1927), in SE1/4SW1/4 sec.10, T.29 N., R.13 W., Kankakee County, Hydrologic Unit 07120002, on right bank at upstream side of bridge on county highway, 3.1 mi downstream from Beaver Creek, 4.5 mi east of Chebanse, and at mile 6.5.

DRAINAGE AREA.-- 2,091 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: April 1923 to current year.

STAGE: Water years 1994 to current year.

SURFACE-WATER QUALITY

CHEMICAL: Water years 1978-1991 and 1999 to 2001. Additional chemical data for water years 1959-77 are published in Water-Resources Investigations 78-23 and 79-24 as site FL 02.

SEDIMENT: October 1978 to September 1981, January 1993 to December 1995.

MISCELLANEOUS: Water years 1998 and 2002; Contaminants in streambed sediments, August 1998; contaminants in fish tissue, August 1998.

BIOLOGICAL

ALGAE: Water year 1999.

BENTHIC MACROINVERTEBRATES: Water year 1999.

FISH: Water year 1999.

HABITAT: Water year 1999-2000.

REVISED RECORDS.-- WSP 1308: 1924-28(M), 1930(M), 1936(M), 1938(M), 1942(M), 1947(M). WDR IL-75-1: Drainage area.

GAGE.-- Water-stage recorder, phone telemetry, and crest-stage gage. Datum of gage is 595.99 ft above NGVD of 1929 (595.71 ft NAVD 1988). Prior to June 16,1976, nonrecording gage, and June 17, 1976 to Aug. 13, 1979 water-stage recorder at site 600 ft upstream at datum 2.00 ft higher. Aug. 14 to Oct. 24, 1979, nonrecording gage at present site at datum 2.00 ft higher.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum estimated discharge, 27,000 ft³/s, May 13, 1933, Mar. 7, 1979; maximum gage height 21.68 ft, Mar. 7, 1979, present datum, ice jam; minimum discharge, 9 ft³/s, Oct. 6-8, 1956.

SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily, 1,400 mg/L, Apr. 14, 1979; minimum daily, 4 mg/L, Mar. 3, 1994.

SUSPENDED-SEDIMENT LOADS: Maximum daily, 57,000 tons, June 5, 1980; minimum daily, 3.2 tons, Nov. 16, 1979.

EXTREMES OUTSIDE PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Flood in spring of 1913 reached a stage of 21.6 ft, present datum, discharge about 34,000 ft³/s.

REMARKS FOR CURRENT YEAR.--Fish community samples were collected as part of the National Water-Quality Assessment program (NAWQA) in the Upper Illinois River Basin. Taxonomy is based on Robins and others (1991), except where modified for the family Moronidae (Johnson, 1984) and the order Cyprinidontiformes (Parenti, 1981). Collection methods followed Meador and others (1993). Collections were made with a boat electroshocker, and seine. Fishes were identified by C. A. Taylor, Illinois Natural History Survey, Champaign. Reach A is located 3.6 mi downstream of the gage (lat 41°02'57.38", long 87°50'31.75") and continues downstream for 984 ft (lat 41°03'06.58", long 87°50'26.37").