USGS Water-Year Summary for Site 07020500

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	Available Parameters
	00060 Discharge(Mean)
	00065 Gage height(Obs.)
	80154 Suspnd sedmnt conc(Mean)
	80155 Suspnd sedmnt disch(Mean)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

07020500 MISSISSIPPI RIVER AT CHESTER, IL

LOCATION - Lat 37°54'02.7", long 89°49'48.8" 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.

REVISIONS HISTORY - WDR MO-76-1: Drainage area. WDR MO-98-1: Extreme outside period of record. Revisions - W.Y. GHT Peak on May 21, 2009 flagged with qualifier 6 - Gage datum changed during this year was applied incorrectly. No documentation to support a datum change. Qualifier removed on Mar. 8, 2022

SURFACE-WATER RECORDS

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 340.73 ft above North American Vertical Datum of 1988. Prior to Feb 1, 1962, nonrecording gage 0.4 mi downstream at present datum.

REMARKS - Accuracy of records is discussed in the annual Station Analysis archived at the USGS MO Water Science Center. Natural flow of stream affected by many reservoirs and navigation dams in upper Mississippi River Basin and by many reservoirs and diversions for irrigation in Missouri River Basin.

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.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD - SUSPENDED-SEDIMENT: Aug 1980 to current year.

REMARKS - For water year 2017, sediment records poor due to the larger periods of missing daily record.

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.