USGS Water-Year Summary 2021
07020500 MISSISSIPPI RIVER AT CHESTER, IL
LOCATION - Lat 37°54'02.67", long 89°49'48.76" referenced to North American Datum of 1983, in sec.27, T.7 S., R.7 W., Randolph County, IL, Hydrologic Unit 07140105, in an aluminum traffic control box on the roof of the City of Chester Water Works pump house approximately 1700 feet downstream of State Highway 51 bridge at Chester, 8.4 mi downstream from Kaskaskia River, and at mile 109.6 above Ohio River.
DRAINAGE AREA - 708,600 mi².
- WDR MO-76-1: Drainage area. WDR MO-98-1: Extreme outside period of record.
PERIOD OF RECORD - DISCHARGE: Oct 1927 to current year. Monthly discharge only for some periods, published in WSP 1311. Since Aug 1873, results of discharge measurements in reports of the Mississippi River Commission.
GAGE HEIGHT: Jul 1942 to current year. Since May 1891, in reports of the Mississippi River Commission and National Weather Service.
GAGE - Water-stage recorder. Datum of gage is 340.72 ft above North American Vertical Datum of 1988. Prior to Feb 1, 1962, nonrecording gage 0.4 mi downstream at present datum.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Jun 30, 1844, reached a gage height of 39.8 ft, discharge, 1,050,000 ft³/s, computed by the U.S. Army Corps of Engineers.
PERIOD OF DAILY RECORD - SUSPENDED-SEDIMENT: Aug 1980 to current year.
EXTREMES FOR PERIOD OF DAILY RECORD - SUSPENDED-SEDIMENT CONCENTRATION: Maximum daily mean, 3,380 mg/L, Apr 13, 1987; minimum daily mean, 13 mg/L, Mar 18, 1981.
SUSPENDED-SEDIMENT DISCHARGE: Maximum daily, 3,330,000 tons, Feb 25, 1997; minimum daily, 3,580 tons, Mar 18, 1981.