07020500 MISSISSIPPI RIVER AT CHESTER, IL
LOCATION.--Lat 37°54'10", long 89°51'10", in SW 1/4 sec.24, T.7 S., R.7 W., third principal meridian, Randolph
County, Hydrologic Unit 07140105, on downstream side of left pier of main truss of highway bridge at Chester,
8.1 mi downstream from Kaskaskia River, and at mile 109.9 above Ohio River.
DRAINAGE AREA.--708,600 mi2, approximately.
PERIOD OF DAILY RECORD.--
SUSPENDED SEDIMENT: August 1980 to current year.
REMARKS.--Sediment records fair.
EXTREMES FOR PERIOD OF DAILY RECORD.--
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily mean, 3,380 mg/L, Apr. 13, 1987; minimum daily mean, 13 mg/L,
Mar. 18, 1981.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 3,330,000 tons, Feb. 25, 1997; minimum daily, 3,580 tons, Mar. 18,
1981.
EXTREMES FOR CURRENT YEAR.--
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily mean, 2,120 mg/L, June 20; minimum daily mean, 104 mg/L, Oct.
9.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 2,400,000 tons, June 20; minimum daily, 32,100 tons, Sept. 15.