USGS Water-Year Summary for Site 251003080435500

Click to hide Water-Year Summary instructions and information

Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
Not all sites have reports available for every water year.

	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00065 Gage height(Max.,Min.,Mean) [NAVD88]
	00095 Specific cond at 25C(Mean,Max.,Min.)
	00480 Salinity(Max.,Mean,Min.)

Select a water year

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

Print this page

USGS Water-Year Summary 2024

251003080435500 McCORMICK CREEK AT MOUTH NEAR KEY LARGO, FL

LOCATION - Lat 25°10'05.50", long 80°44'00.92" referenced to North American Datum of 1983, in T.60 S., R.36 E., Miami-Dade County, FL, Hydrologic Unit 03090202, left bank, approximately 500 ft upstream of the mouth, 17 mi east of Flamingo.

DRAINAGE AREA - Indeterminate.

REVISIONS HISTORY - WDR-US-2010, site 251003080435500; 2009 discharge extremes. WDR-US-2008, site 251003080435500; 2005, 2006, revised salinity record. All updated unit values are available in the files of the U.S. Geological Survey. Data can also be accessed online at http://sofia.usgs.gov/.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1995 to current year.

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

REMARKS - Daily mean discharge is not published. The discharge for this station is more affected by wind than astronomical tides. Discharge at wind-driven sites may require a different filter (subtidal) than the Godin low-pass filter. Discharge and gage height records are available in the files of the U.S. Geological Survey. Mean monthly discharge tables for the period of record are published. Mean monthly discharge tables only include months with a complete record of daily mean discharges. Discharge and gage height 15 minute data and mean monthly discharge data can also be accessed online at http://sofia.usgs.gov/. Daily values of gage height are available online at http://waterdata.usgs.gov/nwis.

EXTREMES FOR PERIOD OF RECORD - DISCHARGE: Maximum positive discharge, 481 ft³/s Aug. 30, 2005; maximum negative, 912 ft³/s Aug. 26, 2005. GAGE HEIGHT: Maximum gage height, 3.86 ft Sept. 10, 2017; minimum, -1.63 ft Feb. 6, 7, 2009.

WATER-QUALITY RECORDS

PERIOD OF RECORD - SALINITY (TOP):October 1995 to September 2011. Discontinued. SALINITY (BOTTOM):October 1995 to current year. SPECIFIC CONDUCTANCE (TOP):October 2010 to September 2011. Discontinued. SPECIFIC CONDUCTANCE (BOTTOM):October 2010 to current year. WATER TEMPERATURE (TOP): October 1995 to September 2011. Discontinued. WATER TEMPERATURE (BOTTOM): October 1995 to current year.

INSTRUMENTATION - Water-quality monitor with bottom sensors.

REMARKS - Prior to Sept. 1, 2010 salinity was computed directly from specific conductance using a conversion within the continuous water quality monitor. From Sept. 14, 2010 to current year, salinity is computed from corrected specific conductance data using a rating in the NWIS database. Salinity and water temperature sensors located at -4.29 ft NAVD 88 (BOTTOM). Salinity and water temperature records are available in files of the U.S. Geological Survey. Salinity and water temperature 15 minute data can also be accessed online at http://sofia.usgs.gov/. Daily values of salinity and water temperature are available online at http://waterdata.usgs.gov/nwis.

EXTREMES FOR PERIOD OF RECORD - SALINITY (TOP): Maximum recorded, 54.2 ppt June 1, 2005; minimum recorded, 0.80 ppt Nov. 6, 1995. SALINITY (BOTTOM): Maximum recorded, 59.8 ppt July 13, 2015; minimum recorded, 0.80 ppt Nov. 6, 1995. SPECIFIC CONDUCTANCE (TOP): Maximum recorded, 73,100 uS/cm @ 25°C June 11, 2011; minimum recorded, 7,330 uS/cm @25°C Nov. 8, 2010. SPECIFIC CONDUCTANCE (BOTTOM): Maximum recorded, 84,500 uS/cm @25°C July 13, 2015; minimum recorded, 2,610 uS/cm @25°C Dec. 9, 2020. WATER TEMPERATURE (TOP): Maximum recorded, 36.7°C July 28, 1999; minimum recorded, 6.9°C Jan. 11, 2010. WATER TEMPERATURE (BOTTOM): Maximum recorded, 36.6°C July 28, 1999; minimum recorded, 6.9°C Jan. 11, 2010.