LOCATION.-- Lat 38°15'46", long 89°43'56" (NAD of 1927), in NE1/4NW1/4 sec.23, T.3 S., R.6 W., St. Clair County, Hydrologic Unit 07140204, on left bank at upstream side of bridge on State Highway 4, 1.6 mi northeast of Marissa, 7.4 mi downstream of South Fork, 12.7 mi upstream from Little Mud Creek, and at mile 13.3. | |
DRAINAGE AREA.-- 72.4 mi2. | |
PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE | |
DISCHARGE: October 1970 to October 1982. | |
REVISED RECORDS.--WDR IL-73-1: Drainage area. | |
GAGE.-- Water-stage recorder and concrete control. Altitude of gage is 402 ft, approximately, from NGVD of 1929. | |
EXTREMES FOR PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 5,520 ft3/s Apr. 12, 1979, gage height, 16.74 ft; maximum gage height, 16.82 ft Mar. 28, 1977; no flow for many days most years. | |