LOCATION.-- Lat 38°15'14", long 89°02'23" (NAD of 1927), in NE1/4NE1/4 sec.24, T.3 S., R.1 E., Jefferson County, Hydrologic Unit 07140106, at bridge on County Highway 9, 1.2 mi downstream from Knob Creek, 2.4 mi downstream from Novak Creek, 3.0 mi north of Waltonville, and at mile 6.7.

DRAINAGE AREA.-- 88.0 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: September 1979 to current year.

STAGE: Water years 1997 to current year. Gage-height record for Feb. 10, 1965 to Sept. 30, 1979 available in files of U.S. Army Corps of Engineers, October 1980 to September 1994 (8 AM gage heights).

SURFACE-WATER QUALITY

CHEMICAL: Water years 1978-91.

REVISED RECORDS.-- WDR IL-94-1: 1982-90.

GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter, and crest-stage gages. Datum of gage is 412.00 ft above NGVD of 1929 (levels by U.S. Army Corps of Engineers).

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 21,200 ft³/s, Nov. 14, 1993, gage height, 17.73 ft; no flow at times in most years.