USGS Water-Year Summary for Site 301124081395901

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean) [Bottom]
	00010 Temperature, water(Max.,Min.,Mean) [Top]
	00065 Gage height(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean) [Bottom]
	00095 Specific cond at 25C(Max.,Min.,Mean) [Top]
	00300 Dissolved oxygen(Max.,Min.,Mean)
	00300 Dissolved oxygen(Max.,Min.,Mean)
	00480 Salinity(Min.,Max.,Mean) [Bottom]
	00480 Salinity(Min.,Max.,Mean) [Top]

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

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USGS Water-Year Summary 2024

301124081395901 ST JOHNS RIVER BUCKMAN BRIDGE AT JACKSONVILLE

LOCATION - Lat 30°11'24", long 81°39'59" referenced to North American Datum of 1927, Duval County, FL, Hydrologic Unit 03080103, below Buckman Bridge, Interstate Highway I-295, one piling east of boat fenders, on north side, 2.7 mi northeast of Orange Park, and 34 mi upstream from mouth.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 2017 to current year (gage-heights only).

GAGE - Water-stage recorder and data-collection platform. Datum of gage is at NAVD of 1988.

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

EXTREMES FOR PERIOD OF RECORD - Maximum gage height, 3.39 ft, Sept. 30, 2022; minimum, -1.83 ft, Feb. 8, 2020.

WATER-QUALITY RECORDS

PERIOD OF RECORD -

SPECIFIC CONDUCTANCE (TOP): June 1995 to September 2003, April 2008 to current year.
SPECIFIC CONDUCTANCE (MIDDLE): June 1995 to September 2003 (discontinued).
SPECIFIC CONDUCTANCE (BOTTOM): June 1995 to September 2003, April 2008 to current year.
WATER TEMPERATURE (TOP): June 1995 to September 2003, April 2008 to current year.
WATER TEMPERATURE (MIDDLE): June 1995 to September 2003 (discontinued).
WATER TEMPERATURE (BOTTOM): June 1995 to September 2003, April 2008 to current year.
DISSOLVED OXYGEN (TOP): June 1995 to September 2003, April 2008 to September 2010, July 2013 to September 2016 (discontinued).
DISSOLVED OXYGEN (MIDDLE): June 1995 to September 2003 (discontinued).
DISSOLVED OXYGEN (BOTTOM): June 1995 to September 2003, April 2008 to September 2010, July 2013 to September 2016 (discontinued).
SALINITY (TOP): October 2016 to current year.
SALINITY (BOTTOM): October 2016 to current year.

COOPERATION - This gage is monitored in cooperation with the St. Johns River Water Management District.

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. June 1995 to September 2003, and April 2008 to September 2008; October 2014 to September 2016; water temperature, specific conductance and dissolved oxygen published as daily mean. October 2008 to September 2010; water temperature, specific conductance and dissolved oxygen published as instantaneous maximum and minimum. October 2010 to September 2016; water temperature, specific conductance, and dissolved oxygen published as instantaneous maximum and minimum. October 2016 to current year: water temperature, specific conductance, and salinity published as instantaneous maximum, minimum, and daily mean.

EXTREMES FOR PERIOD OF RECORD -

SPECIFIC CONDUCTANCE (TOP): Maximum, 41,600 µS/cm @ 25 °C, May 19, 2009; minimum, 310 µS/cm @ 25 °C, Feb. 28, 1998, March 1, 7, 9, 1998.

SPECIFIC CONDUCTANCE (MIDDLE): Maximum, 42,900 µS/cm @ 25 °C, May 3, 1999; minimum, 300 µS/cm @ 25 °C, Feb. 27, 28, 1998.

SPECIFIC CONDUCTANCE (BOTTOM): Maximum, 44,400 µS/cm @ 25 °C, May 21, 2009; minimum, 310 µS/cm @ 25 °C, Feb. 27, 28, 1998, Mar. 1, 7, 8, 1998.

WATER TEMPERATURE (TOP): Maximum, 34.8°C, July 6, 2017; minimum, 6.1 °C, Jan. 11, 2010.

WATER TEMPERATURE (MIDDLE): Maximum, 32.4 °C, Aug. 1, 2, 1999; minimum, 8.0 °C, Jan. 9, 1996, Jan. 4, 5, 2001.

WATER TEMPERATURE (BOTTOM): Maximum, 33.3 °C, July 12, 2016; minimum, 6.1 °C, Jan. 11, 2010.

DISSOLVED OXYGEN (TOP): Maximum, 12.9 mg/L, Jan. 30, 2014; minimum, 2.2 mg/L, Sept. 7, 1998.

DISSOLVED OXYGEN (MIDDLE): Maximum, 12.8 mg/L, Jan. 11, 2001; minimum, 2.2 mg/L, Sept. 8, 1998.

DISSOLVED OXYGEN (BOTTOM): Maximum, 13.5 mg/L, Jan. 11, 2010; minimum, 2.2 mg/L, Sept. 7, 8, 1998.

SALINITY (TOP): Maximum, 25 ppth, Apr. 11, 2023; minimum, 0.2 ppth, many days.

SALINITY (BOTTOM); Maximum, 27 ppth, Apr. 11, 2023; minimum, 0.2 ppth, many days.