USGS Water-Year Summary for Site USGS 301429089145600

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00065 Gage height(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00480 Salinity(Mean)

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

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USGS Water-Year Summary 2023

301429089145600 MISSISSIPPI SOUND AT USGS MERRILL SHELL BANK LIGHT

LOCATION - Lat 30°14'17", long 89°14'34" referenced to North American Datum of 1927, Jackson County, MS, Hydrologic Unit 03170009, St. Stephens Meridian, on the USGS Merrill Shell Bank Light platform, 5 miles south of Pass Christian in the Mississippi Sound.

SURFACE-WATER RECORDS

PERIOD OF RECORD - GAGE HEIGHT: August 1998 to August 2005; November 2008 to current year.

REMARKS - Gage height records fair. Periods of missing records due to instrument malfunctions.

EXTREMES FOR PERIOD OF RECORD - GAGE HEIGHT (August 1998 to August 2005): Maximum recorded, 7.68 ft, Sept. 27, 1998, (Hurricane Georges) but may have been higher during periods of instrument malfunction; minimum recorded, -2.39 ft, Dec. 11, 2004, but may have been lower during periods of instrument malfunction. GAGE HEIGHT (November 2008 to current year): Maximum recorded, 11.57 ft, Aug. 29, 2012 (Hurricane Isaac), but may have been higher during periods of instrument malfunction; minimum recorded, -0.92 ft, Mar. 2, 2009, but may have been lower during periods of instrument malfunction.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1998 to 2005, 2008 to current year.

PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: September 1998 to August 2005, November 2008 to current year. WATER TEMPERATURE: August 1998 to August 2005, November 2008 to current year. TURBIDITY: July 2005 to August 2005.

INSTRUMENTATION - Submersible transducer and data-collection platform DCP) from August 1998 to August 2005, November 2008 to current year. Datum of gage is assumed and may be different between the two time periods. Water-quality monitor from August 1998 to August 2005, November 2008 to current year. The platform and all equipment were destroyed by Hurricane Katrina on August 28, 2005. A new platform and equipment were installed on November 20, 2008.

REMARKS - 10/01/2013-09/30/2014: Specific conductance records fair. Water temperature records good. Interruptions in the record were due to malfunctions of the instrument.

EXTREMES FOR PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: Maximum recorded, 53,300 microsiemens, Dec. 9, 2008, but may have been higher during periods of instrument malfunction; minimum recorded, 1,330 microsiemens, Feb. 28, 2013, but may have been lower during periods of instrument malfunction.

WATER TEMPERATURE: Maximum recorded, 33.0 °C, Aug. 20, 2005, but may have been higher during periods of instrument malfunction; minimum recorded, 4.1 °C, Jan. 10,11, 2010, but may have been lower during periods of instrument malfunction.

TURBIDITY (July 2005 to August 2005): Maximum recorded, 110 FNU, Jul. 10, 2005, but may have been higher during periods of instrument malfunction; minimum recorded, 1.0 FNU, on several days in water year 2005, but may have been lower during periods of instrument malfunction.