USGS Water-Year Summary for Site 07380251

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

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

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USGS Water-Year Summary 2023

07380251 Barataria Bay N of Grand Isle, LA

LOCATION - Lat 29°25'21", long 89°57'02" referenced to North American Datum of 1927, Plaquemines Parish, LA, Hydrologic Unit 08090301, on a two-tier wellhead platform approximately 10.7 miles NNE of Grand Isle Coast Guard Station.

DRAINAGE AREA - Indeterminate.

REVISIONS HISTORY - Minimum recorded gage height for period of record has been revised to reflect the datum used prior to Oct. 1, 1995. Water years 1997 - 2010 were incorrectly published as NAVD 88.

SURFACE-WATER RECORDS

PERIOD OF RECORD - July 1992 to current year.

GAGE - Noncontact water-stage recorder. Datum of gage is 0.39ft below NAVD88 (GEOID12B) EPOCH 2010.0000. Oct 1, 1995 to Feb 15, 1998 datum of gage was NAVD88. Feb 16, 1998 to Oct 16, 2012 datum of gage was 0.97ft below NAVD88 (GEOID03).

COOPERATION - Louisiana Department of Wildlife and Fisheries and Louisiana Coastal Protection and Restoration Authority.

REMARKS - Stage affected by wind and tide. Satellite telemetry with wind speed and direction at station. Site destroyed by Hurricane Gert in Sept 1993. Site destroyed by storm Feb 1998. Site removed and refurbished by landowner in 2012.

EXTREMES FOR PERIOD OF RECORD - Maximum recorded gage height, 8.24 ft, Aug. 29, 2012; minimum recorded gage height, -3.24 ft revised, Feb. 8, 1995.

WATER-QUALITY RECORDS

PERIOD OF RECORD - July 1992 to current year.

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: July 1992 to current year. SALINITY: October 2002 to current year. WATER TEMPERATURE: July 1992 to current year. TURBIDITY: July 2016 to current year. pH: July 2016 to current year. CHLOROPHYLL-A: July 2016 to current year. DISSOLVED OXYGEN: July 2016 to current year.

INSTRUMENTATION - Water-quality monitor recording specific conductance, water temperature, pH, chlorophyll A, turbidity, and dissolved oxygen.

REMARKS - Turbidity data considered poor due to severe biofouling at the site location and extreme wind events causing significant turbulence.

EXTREMES FOR PERIOD OF RECORD - SPECIFIC CONDUCTANCE: Maximum recorded, 50,800 microsiemens/cm, Nov. 28, 2005; minimum recorded, 403 microsiemens/cm, Jan. 9, 2010. SALINITY: Maximum recorded, 33.3 ppt, Nov. 28, 2005; minimum recorded, 0.2 ppt, on many days. WATER TEMPERATURE: Maximum recorded, 35.0°C, Jul. 28, 2015; minimum recorded, 2.9°C, Feb. 5, 1996. PH: Maximum recorded, 8.9 std units, Feb 1, 2, 3, 2017; minimum recorded, 6.9 std units, Sep 8, 2018. TURBIDITY: Maximum recorded, 408NTU, Apr 15, 2018; minimum recorded, 1.3 NTU, Nov 1, 2017. DISSOLVED OXYGEN: Maximum recorded, 15.6 mg/L, Feb 2, 2017; minimum recorded, 0.3 mg/L, Sep 6, 2017.