USGS Water-Year Summary for Site 07374000

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00065 Gage height(Max.,Min.,Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00300 Dissolved oxygen(Mean)
	00400 pH(Max.,Min.,Med.)
	00480 Salinity(Max.,Min.,Mean)
	63680 Turbidity, Form Neph(Mean,Max.,Min.)
	99133 NO3+NO2,water,insitu(Mean)

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

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USGS Water-Year Summary 2023

07374000 Mississippi River at Baton Rouge, LA

LOCATION - Lat 30°26'44.4", long 91°11'29.6" referenced to North American Datum of 1983, in sec.45, T.7 S., R.1 W., West Baton Rouge Parish, LA, Hydrologic Unit 08070100, located on a city Pier, approximately 1.5 mi upstream of the Port Allen Locks, between the I-10 and Hwy. 190 bridges over the river.

DRAINAGE AREA - 1125810 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - March 2004 to current year. Miscellaneous measurements made at site prior to 1976.

GAGE - Water-stage recorder and water-quality monitor. Datum of gage is NAVD 88. Records in the USGS database prior to 2004 were taken from US Army Corps of Engineers publications and adjusted to MSL based on datum information available in those publications.

REMARKS - Records are good. Discharge affected by tide at very low stages. Satellite telemetry at station.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 1,436,000 ft³/s, May 18-19, 2011; maximum gage height, 45.48 ft, May 18-19, 2011; minimum recorded discharge, 132,800 ft³/s, Oct. 31, 2012; minimum recorded gage height, 3.43 ft, Oct. 31, 2012.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1975-76, 1988, 1991-current year.

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: October 2004 to current year. WATER TEMPERATURE: October 2004 to current year. PH: October 2004 to current year. DISSOLVED OXYGEN: October 2004 to current year. TURBIDITY: October 2011 to current year. NITRATE: November 2011 to current year.

INSTRUMENTATION - Water-quality monitor recording temperature, specific conductance, pH, dissolved oxygen, and turbidity. A second monitor is recording nitrate.

EXTREMES FOR PERIOD OF RECORD - SPECIFIC CONDUCTANCE: Maximum, 634 microsiemens/cm, Aug. 23, 2018; minimum, 182 microsiemens/cm, Jun. 4, 2021. WATER TEMPERATURE: Maximum, 32.7°C, Aug. 03, 2012; minimum, 2.2°C, Feb. 21, 22, 2021. PH: Maximum, 8.6 std. units, Mar. 14, 15, 2009; minimum, 6.9 std. units, Mar. 19-20, 2018. DISSOLVED OXYGEN: Maximum, 13.4 mg/L, Feb. 14, 15, 16, 2011; minimum, 5.0 mg/L, Sept. 20, 2018. TURBIDITY: Maximum, 1030 FNU, Apr. 26, 2011; Minimum, 3.8 FNU, Jul. 7, 2012. NITRATE: Maximum, 3.10 mg/L, Jul. 25, 2014; Minimum, 0.22 mg/L, Sept. 11, 12, 13, 2012.