USGS Water-Year Summary for Site 05325000

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	Available Parameters
	00010 Temperature, water(Ins.)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Ins.)
	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

05325000 MINNESOTA RIVER AT MANKATO, MN

LOCATION - Lat 44°10'08", long 94°00'11" referenced to North American Datum of 1927, in SE 1/4 SW 1/4 sec.7, T.108 N., R.26 W., Blue Earth County, MN, Hydrologic Unit 07020007, on right bank 350ft downstream from the Veterans Memorial Bridge in Mankato, 2.0 mi downstream from Blue Earth River and at mile 106.1 upstream from Mississippi River.

DRAINAGE AREA - 14,900 mi².

REVISIONS HISTORY - WSP 875: 1917. WSP 955: Drainage area. WSP 1085: 1929. WSP 1238: 1903, 1908, 1919. WSP 1508: 1916(M), 1918(M), 1926(M), 1928, 1930, 1932(M), 1938(M). WDR-MN-76-1: 1881(M).

SURFACE-WATER RECORDS

PERIOD OF RECORD - May 1903 to current year (no winter records 1904, 1906-10, 1918-29). Monthly discharge only for some periods, published in WSP 1308. Published as "near Mankato": 1903-21.

GAGE - Water-stage recorder. Datum of gage is 747.92 ft above sea level (NGVD of 1929). Prior to Oct. 19, 1921, non-recording gage, at site 1.8 mi upstream at datum 6.4 ft higher. Mar. 15, 1922 to Nov. 30, 1924, non-recording gage, and Dec. 1, 1924 to May 24, 1971, recorder at site 0.2 mi upstream at present datum. May 25, 1971 to Aug. 14, 1977, recorder at site 0.5 mi upstream at present datum. Aug. 14, 1977 to July 27, 1978, non-recording gage; and from July 28, 1978 to Sept. 30, 1993, recording gage at site 0.7 mi upstream of present site.

REMARKS - Records good except those for estimated daily discharges, which are poor.

EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage, 29.9 ft, Apr. 26, 1881, near present site and datum, from floodmark (estimated discharge, 110,000 ft³/s).

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 94,100 ft³/s, stage, 29.09 ft, Apr. 10, 1965; maximum stage, 30.11 ft, June 21, 1993; minimum discharge, 26 ft³/s (minimum observed), Aug. 4, 1934.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1963-66, 1968 to current year.

PERIOD OF DAILY RECORD - WATER TEMPERATURE: October 1967 to September 30, 1981, October 1982 to current year (fragmentary records). SPECIFIC CONDUCTANCE: October 1971 to June 1976, October, 2002 to current year (fragmentary records). SUSPENDED-SEDIMENT DISCHARGE: October 1967 to current year.

REMARKS - Specific conductance values are measured at the USGS sediment lab in Iowa. Water temperature values were obtained approximately monthly by U.S. Geological Survey personnel. In 2018 daily observer sediment samples ceased. In general, daily concentrations and loads for the open-water period are considered fair to poor. During fall of 2013 and the winter period, when few samples were collected, daily sediment concentrations and loads are based primarily on concentrations of sediment in samples that were collected monthly, and on trends of daily water-discharge records. In addition, a sediment transport curve developed using existing data for the 2011 water year was used to help estimate sediment concentrations and loads for some periods. Sediment records are considered fair to poor except those for estimated daily-mean concentrations, which are considered poor. Beginning with the 2011 water year, estimated daily-mean concentrations are denoted with an 'e' flag.

EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum observed, 1,090 uS/cm, Feb. 2, 2012; minimum observed, 288 uS/cm, Mar. 16, 2007. WATER TEMPERATURE: Maximum observed, 31.5 C, Aug. 6, 2001; minimum observed, 0.0 C on many days most winters. SEDIMENT CONCENTRATION: Maximum daily-mean, 2,850 mg/L, Aug. 7, 1968; minimum daily-mean, 5 mg/L (estimated), Mar. 3, 2012. SEDIMENT LOAD: Maximum daily, 414,000 tons, June 21, 1993; minimum daily, 5.2 tons, Nov. 6, 1976.

EXTREMES FOR CURRENT YEAR - SPECIFIC CONDUCTANCE: Maximum observed, 947 uS/cm, Nov. 9; minimum observed, 511 uS/cm, June 24. WATER TEMPERATURES: Maximum observed, 28.0 C, Aug. 14; minimum observed, 5.5 C, Nov. 2,(assumed to be 0.0 C, many days during winter). SEDIMENT CONCENTRATION: Maximum daily-mean, 1,670 mg/L, June 17; minimum daily-mean, 40 mg/L, Oct. 1 SEDIMENT LOAD: Maximum daily, 144,000 tons, June 18; minimum daily, 63 tons, Oct. 1.