LOCATION.--Lat 25°14'33", long 80°26'50", T.60 S., R.39 E., Miami-Dade County, Hydrologic Unit 03090202, located approximately 150 ft upstream of the mouth on the right bank, approximately 6 mi northwest of Key Largo.

DRAINAGE AREA.--Indeterminate.

PERIOD OF RECORD.--February 1996 to current year.

GAGE.--Satellite data collection platform with water-stage shaft encoder and acoustic Doppler velocity meter. Datum of gage North American Vertical Datum of 1988 (NAVD 88).

REMARKS.--Records good. Daily values are not published for this site. Discharge and gage height 15 minute data, are available in the files of the U.S. Geological Survey. Data can also be accessed online at http://sofia.usgs.gov/.

EXTREMES FOR PERIOD OF RECORD.--

DISCHARGE: Maximum positive discharge, 683 ft³/s June 22, 2005; maximum negative, 1,050 ft³/s Oct. 15, 1999.
GAGE HEIGHT: Maximum gage height, 1.86 ft Oct. 16, 1999; minimum, -1.64 ft Mar. 30, 1996.

EXTREMES FOR CURRENT YEAR--.

DISCHARGE: Maximum positive discharge, 683 ft³/s June 22; maximum negative, 829 ft³/s Aug. 26.
GAGE HEIGHT: Maximum gage height, 1.82 ft Aug. 26; minimum, -1.26 ft Feb. 23.

PERIOD OF RECORD.--

SALINITY (TOP, BOTTOM): February 1996 to current year.
WATER TEMPERATURE (TOP, BOTTOM): February 1996 to current year.

INSTRUMENTATION.--Water-quality monitor with top and bottom sensors.

REMARKS.--Salinity (TOP) record rated excellent. Salinity (BOTTOM) record rated excellent except for the following periods: Mar. 13-23, May 25, 26, rated good. Temperature (TOP and BOTTOM) record rated good. Salinity and temperature sensors located at -1.85 ft NAVD 88 (TOP) and -3.75 ft NAVD 88 (BOTTOM). During periods of missing record, values may be higher or lower than the listed extremes. Daily values are not published for this site. Salinity and temperature 15 minute data are available in files of the U.S. Geological Survey. Data can also be accessed online at http://sofia.usgs.gov/.

EXTREMES FOR PERIOD OF RECORD.--

SALINITY (TOP): Maximum recorded, 42.4 ppt May 31, June 1, 2005; minimum recorded, 0.2 ppt occurred on many days during the months of July-Oct. during the 1996, 1997, 1999, and 2001 water years.
SALINITY (BOTTOM): Maximum recorded, 42.7 ppt June 1, 2005; minimum recorded, 0.2 ppt occurred on many days during the months of July-Oct. during the 1996, 1997, 1999, and 2001 water years.
WATER TEMPERATURE (TOP): Maximum recorded, 35.8°C July 12, 2000; minimum recorded, 9.7°C Jan. 19, 1997.
WATER TEMPERATURE (BOTTOM): Maximum recorded, 36.1°C July 25, 26, 1999; minimum recorded, 9.7°C Jan. 19, 1997.

EXTREMES FOR CURRENT YEAR.--

SALINITY (TOP): Maximum recorded, 42.4 ppt May 31, June 1; minimum recorded, 0.3 ppt Sept. 7, 23, 24.
SALINITY (BOTTOM): Maximum recorded, 42.7 ppt June 1; minimum recorded, 0.3 ppt Sept. 23, 24.
WATER TEMPERATURE (TOP): Maximum recorded, 35.7°C Aug. 18, 19; minimum recorded, 13.8°C Jan. 18.
WATER TEMPERATURE (BOTTOM): Maximum recorded, 35.4°C Aug. 17; minimum recorded, 13.8°C Jan 18.

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