USGS Water-Year Summary for Site 07381324

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

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

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USGS Water-Year Summary 2024

07381324 Bayou Grand Caillou at Dulac, LA

LOCATION - Lat 29°22'58", long 90°42'55" referenced to North American Datum of 1927, in sec.86, T.19 S., R.17 E., Terrebonne Parish, LA, Hydrologic Unit 08090302, on the downstream side of Bouquet Bridge, 0.1 miles west of the intersection of Falgout Canal Road and Highway 57, 0.8 miles south of Dulac, 16.4 miles south of Houma.

DRAINAGE AREA - Indeterminate.

REVISIONS HISTORY - Datum of gage was incorrectly published October 1985 to September 2010.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1984 to September 1988 (daily discharge below 6.0 ft stage only). January 1989 to September 1998. October 1999 to current year.

GAGE - Water-stage recorder and acoustic velocity meter. Datum of gage is 0.357 ft above NAVD 88, Geoid03.

REMARKS -

No estimated daily discharge. Records poor. Site affected by wind, tide, and boat traffic. 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.

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 prior to October 29, 2013.

Maximum positive discharge estimated discharge due to rating model exceedance during Hurricane Ida in August 2021.

EXTREMES FOR PERIOD OF RECORD - Maximum recorded positive discharge, 3,570 ft³/s, Aug 29, 2021, estimated; maximum gage height, 8.89 ft, Oct 28, 1985; maximum negative discharge, -4,630 ft³/s, Sep 23, 2004; minimum gage height, not determined.

WATER-QUALITY RECORDS

PERIOD OF RECORD - October 2002 to January 2018.

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: October 2002 to January 2018. SALINITY: October 2002 to January 2018. WATER TEMPERATURE: October 2002 to January 2018.

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

EXTREMES FOR PERIOD OF RECORD - SPECIFIC CONDUCTANCE: Maximum, 44,700 microsiemens/cm, Oct 16, 2006; minimum, 264 microsiemens/cm, Feb 19, 2010. SALINITY: Maximum, 28.8 ppt, Oct 16, 2006; minimum, 0.1 ppt, May 30, 2004, Mar 13, 2005, Feb 19, 2010, and May 20, 2013. WATER TEMPERATURE: Maximum, 34.6°C, Aug 3, 2010, Aug. 22, 2011; minimum, 2.0°C, Jan 9, 2010.