LOCATION.-- Lat 38°30'25", long 89°16'24" (NAD of 1927), in NE1/4NE1/4 sec.26, T.1 N., R.2 W., Washington County, Hydrologic Unit 07140202, on left bank at downstream side of bridge on County Highway 24, 2.2 mi southwest of Hoffman, 4.8 mi southeast of Posey, about 9 mi upstream from State Highway 127, and at mile 20.9. | |
DRAINAGE AREA.-- 254 mi2. | |
PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE | |
DISCHARGE: October 1974 to September 1998. | |
STAGE: Water years 1994 to current year. October 1968 to September 1974, available in files of Illinois Water Science Center. | |
SURFACE-WATER QUALITY | |
CHEMICAL: Water years 1979-91. | |
GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter, and crest-stage gage. Datum of gage is 420.19 ft above NGVD of 1929. | |
EXTREMES FOR PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 26,900 ft3/s, from rating curve extended above 16,400 ft3/s, May 17, 1990, gage height, 17.40 ft; minimum observed, 1.77 ft, Sept. 22, 1976. | |