USGS Water-Year Summary for Site 07374525

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	Available Parameters
	00060 Discharge(Mean)
	00065 Gage height(Mean)
	63680 Turbidity, Form Neph(Min.,Mean,Max.)
	72294 Mean water velocity(Mean)

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

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USGS Water-Year Summary 2023

07374525 Mississippi River at Belle Chasse, LA

LOCATION - Lat 29°51'25", long 89°58'40" referenced to North American Datum of 1927, Plaquemines Parish, LA, Hydrologic Unit 08090100, located on left bank on US Coast Guard channel light 76, approximately 1/2 mile downstream of Belle Chasse/Scarsdale ferry.

DRAINAGE AREA - 1130000 mi² of which 20,000 mi² probably is noncontributing.

REVISIONS HISTORY - 2020 water year, mean daily discharge values.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 2008 to present.

GAGE - Water-stage recorder and acoustic velocity meter. Datum of gage is 6.58 feet below NAVD88 GEOID12B EPOCH 2010.0000

REMARKS - Station affected by tide at all stages. Satellite telemetry at station.

EXTREMES FOR PERIOD OF RECORD - Maximum recorded discharge, 1,390,000 ft³/s, Jan 22, 2016, and Mar 11, 2018; maximum recorded gage height, 18.54 ft, Nov. 10, 2009, July 12, 2019, Hurricane Barry; maximum recorded negative discharge, -182,000 ft³/s, Aug. 28, 2012, Hurricane Isaac; minimum recorded gage height, 6.33 ft, Dec. 2, 2008, Dec. 13, 2012.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1975-99, May 2006 to present.

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: October 1974 to May 1990. WATER TEMPERATURE: October 1975 to May 1990. CHLORIDE: October 1974 to May 1990. SULFATE: October 1974 to September 1978. DISSOLVED SOLIDS: October 1978 to May 1990. TURBIDITY: October 2012 to current year.

INSTRUMENTATION - Water-quality monitor recording turbidity.

REMARKS - Turbidity records fair due to large amount of surging and marine traffic.

EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum daily, 692 microsiemens/cm Jan. 31, 1981: minimum daily, 223 microsiemens/cm Mar. 7, 1989. WATER TEMPERATURE: Maximum daily, 38.0°C June 9, 1984; minimum daily, 2.0°C Feb. 7, 1984. CHLORIDE: Maximum daily, 85 mg/L June 26, 27, 1977; minimum daily, 11 mg/L Apr. 21, May 12, 1975, May 12, 1984, Mar. 7, 1989. SULFATE: Maximum daily, 93 mg/L Oct. 30, 1976; minimum daily, 28 mg/L Feb. 3, 1975. DISSOLVED SOLIDS: Maximum daily, 415 mg/L on several days; minimum daily, 145 mg/L on many days. TURBIDITY: Maximum, 250 FNU Jan. 25, 2014; minimum, 2.3 FNU Oct. 7, 2017.