LOCATION.-- Lat 39°14'03", long 90°23'40" (NAD of 1927), in SE1/4SE1/4 sec.11, T.9 N., R.12 W., Greene County, Hydrologic Unit 07130012, on left bank at downstream side of bridge on State Highway 267, 1.4 mi downstream from Link Branch, 3.5 mi northwest of Kane, and at mile 16.1.

DRAINAGE AREA.-- 868 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: March 1921 to November 1933, May to August 1940, October 1940 to current year.

STAGE: Water years 1994 to current year.

SURFACE-WATER QUALITY

CHEMICAL: Water years 1978-91.

MISCELLANEOUS: Water year 2002.

BIOLOGICAL

ALGAE: Water year 1997.

BENTHIC MACROINVERTEBRATES: Water year 1997.

REVISED RECORDS.-- WSP 1175: 1924. WSP 1308: 1922(M), 1928(M), 1931(M). WDR IL-75-1: Drainage area.

GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 426.77 ft above NGVD of 1929 (426.36 ft NAVD 1988). Prior to Oct. 1, 1925, nonrecording gage at site 2.0 mi upstream at datum 434.18 ft NGVD of 1929. Oct. 1, 1925 to Sept. 30, 1928, nonrecording gage at site 2.0 mi upstream at datum 434.18 ft NGVD of 1929. Oct. 1, 1928 to May 17, 1940, nonrecording gage at site 800 ft downstream at present datum. May 17, 1940 to May 17, 1943, water-stage recorder, and May 18, 1943 to July 19, 1970, nonrecording gage at site 800 ft downstream at present datum. July 20 to Sept. 18, 1970, nonrecording gage at present site and datum.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 40,100 ft³/s, April 12, 1994, gage height, 28.32 ft; maximum gage height, 28.50 ft, May 18, 1943; no flow Oct. 19-27, 1955.