USGS Water-Year Summary 2021
05595860 CASEY FORK SUBIMPOUNDMENT NEAR BONNIE, IL
LOCATION - Lat 38°11'15", long 88°55'38" referenced to North American Datum of 1927, in SW 1/4 SW 1/4 sec.7, T.4 S., R.3 E., Jefferson County, IL, Hydrologic Unit 07140106, on left bank at upstream side of subimpoundment dam, about 1 mi upstream from Atchison Creek, about 2 mi southwest of Bonnie, and about 12 mi upstream from Rend Lake Dam.
DRAINAGE AREA - 133 mi².
PERIOD OF RECORD -
STAGE: November 1983 to current.
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) (399.66 ft NAVD 1988).
EXTREMES FOR PERIOD OF RECORD -
STAGE: Maximum gage height, 14.00 ft, Nov. 14, 1993; minimum, 4.31 ft, Jan. 18, 1990.