LOCATION.-- Lat 39°57'05", long 89°23'00" (NAD of 1983), in NW1/4 SW1/4 sec.1, T.17 N., R.3 W., Logan County, Hydrologic Unit 07130009, on right bank at downstream side of bridge on State Highway 54, 100 ft upstream from a railroad bridge, 2.0 mi northeast of Cornland, 8 mi downstream from Jones Fork, and at mile 12.9.

DRAINAGE AREA.-- 214 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: January 1948 to current year.

STAGE: Water years 1994 to current year.

SURFACE-WATER QUALITY

CHEMICAL: Water years 1978-91.

REVISED RECORDS.-- WDR IL-75-1: Drainage area.

GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 555.06 ft above NGVD of 1929 (554.75 ft NAVD 1988). Prior to Sept. 6, 1973, nonrecording gage at same site and datum.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 8,930 ft³/s, Apr. 12, 1979, gage height, 23.11 ft; minimum, 0.30 ft³/s, Sept. 16, 1988.

EXTREMES OUTSIDE PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Flood in May 1943 reached a stage of 23.4 ft, from floodmarks, discharge 29,000 ft³/s, by contracted-opening measurement of peak flow.