LOCATION.-- Lat 38°46'33", long 89°29'56" (NAD of 1927), in NW1/4SW1/4 sec. 24, T.4 N., R.4 W., Bond County, Hydrologic Unit 07140203, on left bank at upstream side of bridge on State Highway 143, 1.1 mi east of Baden Baden, 6.5 mi east of Pierron, and at mile 43.0.

DRAINAGE AREA.-- 678 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: May, 1995 to current year.

STAGE: May 1995 to current year. Gage-height record for Dec. 16, 1970 to May 30, 1978, and Apr. 5, 1995 to May 5, 1995 available in files of U.S. Army Corps of Engineers.

GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter, and crest-stage gage. Datum of gage is 400.00 ft above NGVD of 1929 (levels by U.S. Army Corps of Engineers) (399.61 ft NAVD 1988).

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 24,000 ft³/s, May 8, 2002, gage height 60.85 ft; minimum discharge, 4.5 ft³/s, Sept. 13, 2005.

EXTREMES OUTSIDE PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Flood of Apr. 23, 1973 reached a stage of 59.48 ft, discharge 14,900 ft³/s, from information by the U.S. Army Corps of Engineers.