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Water-Year Summary for Site 06934500

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Available Parameters
00010 Temperature, water(Max.,Min.,Mean)  
00060 Discharge(Mean)  
00065 Gage height(Obs.)  
00095 Specific cond at 25C(Max.,Min.,Mean)  
00300 Dissolved oxygen(Max.,Min.,Mean)  
00400 pH(Max.,Min.,Med.)  
63680 Turbidity, Form Neph(Mean,Max.,Min.)  
80297 SS load, regres ss(Mean)  
99133 NO3+NO2,water,insitu(Max.,Min.,Mean)  
99409 Susp sediment,wu,est(Mean)  

Water year 2023: 2022-10-01 to 2023-09-30
 
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USGS Water-Year Summary 2023
06934500 MISSOURI RIVER AT HERMANN, MO
LOCATION - Lat 38°42'35.3", long 91°26'18.6" referenced to North American Datum of 1983, in SW 1/4 sec.25, T.46 N., R.5 W., Montgomery County, MO, Hydrologic Unit 10300200, on downstream side of third pier from right abutment of bridge on State Highway 19 at Hermann, 7 miles downstream from Gasconade River, and at mile 97.9.
DRAINAGE AREA - 522,500 mi². the 3,959 mi² in Great Divide basin are not included.
REVISIONS HISTORY - WDR MO-76-1: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Oct 1897 to current year. Prior to Aug 1928 monthly discharge only published in WSP 1310. Gage-height records 1873-99 collected at site 480 ft downstream are contained in reports of Missouri River Commission; since 1900 in reports of the National Weather Service.
REVISED RECORDS - WDR MO-76-1: Drainage area.
GAGE - Water-stage recorder. Datum of gage is 481.50 ft above North American Vertical Datum of 1988. Prior to Sep 26, 1930, nonrecording gage at site 480 ft downstream at datum 0.07 ft lower; Sep 26, 1930, to Mar 27, 1932, nonrecording gage; Mar 28, 1932, to Jun 12, 1945, water-stage recorder; Jun 13, 1945, to Apr 2, 1946, May 13 to Sep 30, 1978, nonrecording gage at present site and datum.
REMARKS - Accuracy of records is discussed in the annual Station Analysis archived at the USGS MO Water Science Center.  Regulation from many upstream reservoirs since 1958.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of June 1844 reached a stage of 35.5 ft, discharge, about 700,000 ft³/s, computed by the U.S. Army Corps of Engineers.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Jul 1969 to current year. National Stream-Quality Accounting Network station Sep 1989 to current year. Discrete suspended and bed material sediments Oct 1988 to current year.
PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Oct 1974 to Sep 1996, Feb 2006 to current year (Seasonally). pH: Feb 2006 to Sep 2007. WATER TEMPERATURE: Oct 1974 to Sep 1996, Feb 2006 to Sep 2010 (Seasonally), Oct 2010 to current year. DISSOLVED OXYGEN: Jun to Sep 1984, Apr to Sep 1985, Apr to Sep 1986, Feb 2006 to current year (Seasonally). TURBIDITY: Feb 2006 to Sep 2010 (Seasonally), Oct 2010 to current year. SUSPENDED-SEDIMENT CONCENTRATION: Oct 2008 to current year. SUSPENDED-SEDIMENT DISCHARGE: Oct 2008 to current year.
INSTRUMENTATION - Water-quality monitor, February 2006 to current year. U.S.G.S. satellite telemeter at station.
REMARKS - Interruptions or periods of missing record may be due to instrument failure, ice conditions, no flow conditions, or data corrections exceeding allowable criteria, which were deleted. SPECIFIC CONDUCTANCE: For water year 2016, record good except Nov. 4-14 which are fair, Nov. 15-Dec. 15 which are poor. pH: For Water Year 2016, record good. WATER TEMPERATURE: For water year 2016, record good. DISSOLVED OXYGEN: For water year 2016, record good. TURBIDITY: For water year 2016, record rated good except Jan. 7-16 which are fair, Jan. 17-Feb. 19 which are poor. Data collected using a YSI 599101 turbidity sensor. Negative recorded values are reported as 0 FNU. SUSPENDED SEDIMENT: For water year 2016, record fair except for estimated days, which are poor.
EXTREMES FOR PERIOD OF RECORD - SPECIFIC CONDUCTANCE: Maximum recorded, 2,150 uS/cm (once daily measurement), Dec 9, 1978; minimum recorded 104 uS/cm, Aug. 3, 2016. pH: Maximum recorded, 10.9 standard units, Jan 23, 2014; minimum recorded 6.3 standard units, Feb. 26, 2016. WATER TEMPERATURE: Maximum recorded, 32.5 °C (once daily measurement), Jul 31, 1987; minimum recorded, -0.2 °C, Jan 12-13, 2011. DISSOLVED OXYGEN: Maximum recorded 15.5 mg/L, Jan 28, 2014; minimum recorded, 1.7 mg/L, May 9, 2007. TURBIDITY: Maximum recorded, 1,690 FNU, Jun 7, 2014, but may have been higher during periods of missing record; minimum recorded, 2.1 FNU, Feb 2, 3, 2012.
EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum daily, 909 uS/cm, Nov. 15 and 16, 2016; minimum daily, 244 uS/cm, Aug. 5, 2016. pH: Maximum daily, 9.6 standard units, Jan 23, 2014; minimum daily, 6.9 standard units, May 19-20, Jun 7, 9-10, 2014. WATER TEMPERATURE: Maximum daily, 31.5 °C, Jul 20, 2006; minimum daily, -0.1 °C, Dec 14, 2010, Jan 12, 17, 18, 2011. DISSOLVED OXYGEN: Maximum daily, 15.2 mg/L, Jan 28 2014; minimum daily, 2.3 mg/L, Jun 8 2014. TURBIDITY: Maximum daily, 1,310 FNU, Jun 9, 2014, but may have been higher during periods of missing record; minimum daily, 2.4 FNU, Feb 2, 2012. SUSPENDED-SEDIMENT CONCENTRATION: Maximum daily, 3,180 mg/L, Jun. 9, 2014; minimum daily, 37 mg/L, Feb 1, 2, 2012. SUSPENDED-SEDIMENT DISCHARGE: Maximum daily, 2,130,000 tons, Jun 1, 2013; minimum daily, 4,870e tons, Feb. 15, 16, 2014.