USGS Water-Year Summary for Site 02246518

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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)
	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

02246518 POTTSBURG CREEK AT US 90 NEAR SOUTH JACKSONVILLE, FL

LOCATION - Lat 30°17'13.09", long 81°34'12.00" referenced to North American Datum of 1983, in T.2 S., R.27 E., Duval County, FL, Hydrologic Unit 03080103, in land grant 52, on right bank 150 ft upstream of US 90 bridge, 4.9 mi east of San Marco and 5.2 mi upstream from mouth.

DRAINAGE AREA - Indeterminate.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 2015 to current year.

GAGE - Water-stage recorder, acoustic velocity meter, and data-collection platform. Datum of gage is at NAVD of 1988 (levels by Florida Dept. of Environmental Protection).

COOPERATION - This gage is monitored in cooperation with the U.S. Army Corps of Engineers.

REMARKS - Discharge not published some days, due to bad or missing velocity data. 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. By convention, the U.S. Geological Survey has established ebb (seaward) flows as positive flow and flood (landward) flows as negative flows. The residuals are not total freshwater flows but are a combination of freshwater flows and water storage caused by higher and lower mean sea levels and storm surges from tropical storm events. Instantaneous discharge computed from index-velocity linear regression relation and gage height rating. Daily values of discharge and gage-height are available online at http://waterdata.usgs.gov/nwis.

WATER-QUALITY RECORDS

PERIOD OF RECORD -

SPECIFIC CONDUCTANCE: October 2015 to current year.

WATER TEMPERATURE: October 2015 to current year.

SALINITY: October 2015 to current year.

INSTRUMENTATION - Water-quality monitor and data-collection platform.

REMARKS - Extremes for current year and extremes for period of daily record are based on recorded values and may have been exceeded during periods of no record. October 2015 to current year; water temperature, specific conductance, and salinity published as daily maximum, minimum, and mean.

EXTREMES FOR PERIOD OF RECORD -

SPECIFIC CONDUCTANCE: Maximum, 27,200 µS/cm @ 25 °C, Mar. 23, 2021; minimum, 76 µS/cm @ 25 °C, July 30, 2017.

WATER TEMPERATURE: Maximum, 34.9 °C, June 2, 2019; minimum, 5.8°C, Jan. 5, 2018.

SALINITY: Maximum, 17.0 ppth, Mar. 23, 2021; minimum, 0.0 ppth, many days.