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Water-Year Summary for Site 302309081333001

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Available Parameters
00010 Temperature, water(Max.,Mean,Min.) [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) [Bottom]  
00300 Dissolved oxygen(Max.,Min.,Mean) [Top]  
00480 Salinity(Min.,Max.,Mean) [Bottom]  
00480 Salinity(Min.,Max.,Mean) [Top]  

Water year 2023: 2022-10-01 to 2023-09-30
 
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USGS Water-Year Summary 2023
302309081333001 ST. JOHNS RIVER AT DAMES POINT BRIDGE AT JACKSONVILLE, FL
LOCATION - Lat 30°23'09", long 81°33'30" referenced to North American Datum of 1927, in T.1 S., R.28 E., Duval County, FL, Hydrologic Unit 03080103, gage is on top of circular concrete barrier on the northeast (downstream) side of Dames Point Bridge, at Dames Point, and 9 mi upstream from mouth. 
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 2017 to April 2018 (gage-heights only), May 2018 to current year (gage-height and instantaneous velocities).
GAGE - Water-stage recorder, acoustic velocity meter, 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, 4.86 ft, Nov. 10, 2022; minimum, -4.07 ft, Feb. 8, 2020.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE (TOP, BOTTOM): March 1996 to October 2001, October 2003 to current year.

WATER TEMPERATURE (TOP, BOTTOM): March 1996 to October 2001, October 2003 to current year.

DISSOLVED OXYGEN (TOP, BOTTOM): May 1996 to October 2001, October 2003 to September 2019, July 2020 to September 2021 (discontinued).

SALINITY (TOP, 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. March 1996 to October 2001, October 2003 to September 2008; water temperature, specific conductance and dissolved oxygen published as daily mean. October 2008 to current year; water temperature, specific conductance and dissolved oxygen published as instantaneous maximum and minimum. October 2014 to September 2016, water temperature, specific conductance, dissolved oxygen, and salinity published as instantaneous maximum and minimum, and daily mean. October 2016 to current year; water temperature, specific conductance, dissolved oxygen, and salinity published as instantaneous maximum, minimum, and daily mean. October 2019 to current year; water temperature, specific conductance, and salinity published as instantaneous maximum, minimum, and daily mean. Period of record extremes updated to reflect instantaneous maximum and minimum.
EXTREMES FOR PERIOD OF RECORD -

SPECIFIC CONDUCTANCE (TOP): Maximum, 59,000 µS/cm @ 25 °C, Dec. 22, 2007; minimum, 563 µS/cm @ 25 °C, Dec. 27, 2005.

SPECIFIC CONDUCTANCE (BOTTOM): Maximum, 60,200 µS/cm @ 25 °C, Jan. 8, 2001; minimum, 597 µS/cm @ 25 °C, Dec. 27, 2005.

WATER TEMPERATURE (TOP): Maximum, 35.8 °C, Aug. 13, 2023; minimum, 3.4 °C, Jan. 10, 2010.

WATER TEMPERATURE BOTTOM): Maximum, 33.7 °C, July 28, 2016; minimum, 1.4 °C, Jan. 10, 2010.

DISSOLVED OXYGEN (TOP): Maximum, 12.7 mg/L, Dec. 15, 2010; minimum, 3.1 mg/L, June 28, 2006.

DISSOLVED OXYGEN (BOTTOM): Maximum, 14.0 mg/L, Jan. 13, 2010; minimum, 2.1 mg/L, Sept. 11,12, 2016.

SALINITY (TOP):  Maximum, 36.6 ppth, Apr. 9, 2023; minimum, 0.3 ppth, Oct. 6-10, 23-24, 2017.

SALINITY (BOTTOM); Maximum, 36.1 ppth, June 8, 9, 2017; minimum, 0.3 ppth, Oct. 6-10, 23-24, 2017.