USGS Water-Year Summary for Site 255327081275900

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	Available Parameters
	00010 Temperature, water(Mean,Max.,Min.)
	00060 Discharge(Mean)
	00065 Gage height(Max.,Min.)
	00095 Specific cond at 25C(Mean,Max.,Min.)
	00480 Salinity(Mean,Max.,Min.)
	63160 Stream level, NAVD88(Min.,Max.)
	72137 Discharge,tide fltrd(Mean)

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

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USGS Water-Year Summary 2024

255327081275900 EAST RIVER NEAR EVERGLADES CITY, FL

LOCATION - Lat 25°53'43.4", long 81°27'19.8" referenced to North American Datum of 1983, Collier County, FL, Hydrologic Unit 03090204, located on the right bank, 1.9 mi from the mouth, 5.5 mi southeast from the Port of the Islands Marina.

DRAINAGE AREA - Indeterminate.

SURFACE-WATER RECORDS

PERIOD OF RECORD -

DISCHARGE: April 2007 to September 2008. April 2010 to April 2012. October 2013 to current year.

GAGE HEIGHT: April 2007 to September 2008. April 2010 to current year.

GAGE - Satellite data collection platform with water-stage shaft encoder and acoustic Doppler velocity meter. Datum of gage is 7.82 ft above North American Vertical Datum of 1988.

REMARKS - Streamflow at this site is significantly affected by astronomical tides. Daily mean discharge was computed from filtered unit value discharge data. The Godin low-pass filter was used to remove principal tidal frequencies from unit values. Positive discharge is generally to the southwest and negative discharge to the northeast. Discharge and gage height data are available in files of the U.S. Geological Survey and online at http://waterdata.usgs.gov/nwis.

EXTREMES FOR PERIOD OF RECORD -

DISCHARGE: Maximum positive discharge (unfiltered), 911 ft³/s Sept. 2, 2016; maximum negative discharge (unfiltered), 1,462 ft³/s Sept. 10, 2017 (last recorded value of Hurricane Irma storm surge before station was flooded; value likely exceeded).

GAGE HEIGHT: Maximum gage height, 13.26 ft Sept. 10, 2017 (debris in mangrove canopy from Hurricane Irma), accuracy > 0.4 ft; minimum, 4.48 ft Jan. 3, 2008.

WATER-QUALITY RECORDS

PERIOD OF RECORD -

SALINITY (TOP): April 2007 to September 2008. April 2010 to September 2011. Discontinued.

SALINITY (BOTTOM): April 2007 to September 2008. April 2010 to current year.

WATER TEMPERATURE (TOP): April 2007 to September 2008. April 2010 to September 2011. Discontinued.

WATER TEMPERATURE (BOTTOM): April 2007 to September 2008. April 2010 to current year.

INSTRUMENTATION - Water quality monitor.

REMARKS - Salinity and water temperature sensors were located at surface (TOP) and an arbitrary 2.4 ft (BOTTOM). The top probe was removed on Oct. 5, 2011. The bottom probe was moved to a new arbitrary elevation of 3.7 ft on Oct. 21, 2015. Salinity and water temperature data are available in files of the U.S. Geological Survey and online at http://waterdata.usgs.gov/nwis.

EXTREMES FOR PERIOD OF RECORD -

SALINITY (TOP): Maximum recorded, 42.4 ppt May 15, 2020; minimum recorded, 1.0 ppt Sept. 24, 25, 2008.

SALINITY (BOTTOM): Maximum recorded, 41.2 ppt May 19, 2013; minimum recorded, 0.5 ppt, several days in Aug. and Sept. 2017, Oct.1, 2017.

WATER TEMPERATURE (TOP): Maximum recorded, 34.2 °C June 16, 2010; minimum recorded, 12.2 °C Dec. 16, 2010.

WATER TEMPERATURE (BOTTOM): Maximum recorded 34.3 °C June 16, 2010; minimum recorded, 12.1 °C Dec. 16, 2010.