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- 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.
USGS Water-Year Summary 2024
301817081393600 ST JOHNS RIVER BL MARCO LK AT JACKSONVILLE, FL
LOCATION - Lat 30°18'17.21", long 81°39'36.36" referenced to North American Datum of 1983, in T.2 S., R.27 E., Duval County, FL, Hydrologic Unit 03080103, in land grant 46, on right bank, attached to concrete seawall, 35 ft west of the corner of Landon Ave. and River Rd., 0.7 mi upstream of Fuller Warren Bridge, 1.8 mi south of Jacksonville, and 2.5 mi upstream from mouth.
WATER-QUALITY RECORDS
PERIOD OF RECORD -
SPECIFIC CONDUCTANCE: January 2016 to current year.
WATER TEMPERATURE: January 2016 to current year.
SALINITY: January 2016 to current year.
COOPERATION - This gage is monitored in cooperation with the U.S. Army Corps of Engineers.
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. January 2016 to September 2016; water temperature, specific conductance, and salinity published as instantaneous maximum and minimum and daily mean.
EXTREMES FOR PERIOD OF RECORD -
SPECIFIC CONDUCTANCE: Maximum, 49,100 µS/cm @ 25 °C, Apr. 10, 11, 2023; minimum, 415 µS/cm @ 25 °C, Dec. 28, 2020.
WATER TEMPERATURE: Maximum, 35.9 °C, Aug. 27, 2023; minimum, 7.6 °C, Jan. 5, 6, 2018.
SALINITY: Maximum, 32.0 ppth, Apr. 10, 11, 2023; minimum, 0.2 ppth, many days.
