USGS Water-Year Summary for Site 295124089542100

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	Available Parameters
	00010 Temperature, water(Mean)
	00060 Discharge(Mean)
	00065 Gage height(Mean)
	00095 Specific cond at 25C(Mean)
	00480 Salinity(Mean)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

295124089542100 Caernarvon Outfall Channel at Caernarvon, LA

LOCATION - Lat 29°51'12.8", long 89°54'27.7" referenced to North American Datum of 1983, Plaquemines Parish, LA, Hydrologic Unit 08090203, on a four-legged platform, 1000 yards downstream of the outfall of the Caernarvon control structure.

DRAINAGE AREA - Indeterminate.

SURFACE-WATER RECORDS

PERIOD OF RECORD - January 2001 to September 2015, October 2015 to current year (unit values only).

GAGE -

Water-stage recorder and acoustic velocity meter.

Datum of gage is 0.46 feet below NAVD 88 GEOID12b EPOCH 2010.0000.

REMARKS -

Negative discharge indicates flow into marsh storage, not into the Mississippi River.

Satellite telemetry at station.

Positive and negative flows at this site are defined by direction and are specified to be parallel to the channel at the gage location. The Positive flow direction is south-southeast.

Streamflow at this site is affected significantly by astronomical tides. Astronomical tides cause significant cycles of approximately 24.84 hours at this site. Because a different portion of the 24.84 hour tidal cycle is averaged in successive daily (24-hour) computations, a systematic secondary oscillation, unrelated to basin hydrology and having a period of about two weeks may be apparent in daily data published from January 2001 to September 2015.

Extremes for period of record may have been exceeded during period of missing record during Hurricane Katrina, 2005; Hurricane Gustav, 2009; Hurricane Isaac, 2012; Hurricane Ida, 2021 and/or rating model exceedance.

EXTREMES FOR PERIOD OF RECORD - Maximum recorded positive discharge, 9870 ft³/s, May 9, 2008; maximum recorded gage height, 8.87 ft., Aug. 28, 2021, Hurricane Ida; maximum recorded negative discharge, -2200 ft³/s, Oct. 5, 2007; minimum recorded gage height, -1.18 ft, Aug. 25, 2008.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: October 2002 to current year. SALINITY: October 2002 to current year. WATER TEMPERATURE: October 2002 to current year.

INSTRUMENTATION - Water-quality monitor recording specific conductance and water temperature.

REMARKS - Extremes for period of record may have been exceeded during period of missing record during Hurricane Katrina, 2005; Hurricane Gustav, 2009; Hurricane Isaac, 2012; Hurricane Ida, 2021.

EXTREMES FOR PERIOD OF RECORD - SPECIFIC CONDUCTANCE: Maximum recorded, 5,320 microsiemens/cm, Sep 27, 2004; minimum recorded, 177 microsiemens/cm, May 11, 2004. SALINITY: Maximum recorded, 2.9 ppt, Sep 27, 2004; minimum, 0.1 ppt, on many days. WATER TEMPERATURE: Maximum recorded, 34.6°C, Jun. 30, 2012; minimum recorded, 2.7°C, Jan. 14, 15, 19, 2010.