USGS Water-Year Summary 2023
07010000 MISSISSIPPI RIVER AT ST. LOUIS, MO
LOCATION - Lat 38°37'44.4", long 90°10'47.2" referenced to North American Datum of 1983, in T.45 N., R.7 E., St. Louis City, MO, Hydrologic Unit 07140101, on downstream side of west pier of Eads Bridge at St. Louis, 15.0 mi downstream from Missouri River, 19.2 mi upstream from Meramec River, and at mile 180.0 above the Ohio River.
DRAINAGE AREA - 697,000 mi².
- WDR MO-76-1: Drainage area.
PERIOD OF RECORD - DISCHARGE: Jan 1861 to current year. Monthly discharge only for some periods, published in WSP 1311.
GAGE HEIGHT: Mar 1933 to current year. Since Jan 1861 in reports of Mississippi River Commission. Since Jan 1890 in reports of the National Weather Service.
REVISED RECORDS - WDR MO-76-1: Drainage area.
GAGE - Water-stage recorder. Datum of gage is 379.58 ft above North American Vertical Datum of 1988. Prior to May 5, 1934, nonrecording gage 0.4 mi downstream; May 5, 1934, to Dec 9, 1952, water-stage recorder at site 20 ft downstream at present datum.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Jun 27, 1844, reached a stage of 41.32 ft, from floodmarks, discharge, 1,000,000 ft³/s, computed by U.S. Army Corps of Engineers. Flood in Apr 1785 may have reached a stage of 42.0 ft. Minimum flow, 18,000 ft³/s, Dec 23, 1863.
PERIOD OF RECORD - WATER TEMPERATURE: Oct 1951 to Sep 1992.
SEDIMENT RECORDS: Apr 1948 to current year.
WATER-QUALITY RECORDS: Oct 2004 to Sep 2007.
EXTREMES FOR PERIOD OF RECORD - SUSPENDED-SEDIMENT CONCENTRATION: Maximum daily mean, 6,720 mg/L, Feb 24, 1985; minimum daily mean, 19 mg/L, Jan 21 and 22, 1967.
SUSPENDED-SEDIMENT DISCHARGE: Maximum daily, 9,830,000 tons, Feb 24, 1985; minimum daily, 2,800 tons, Jan 21, 1967.