USGS Water-Year Summary for Site 294213081345300

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00300 Dissolved oxygen(Max.,Min.,Mean)
	00480 Salinity(Max.,Mean,Min.)
	63680 Turbidity, Form Neph(Mean)

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

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USGS Water-Year Summary 2024

294213081345300 ST. JOHNS RIVER AT DANCY POINT NEAR SPUDS, FL

LOCATION - Lat 29°42'13", long 81°34'53" referenced to North American Datum of 1927, in T.9 S., R.27 R., Putnam County, FL, Hydrologic Unit 03080103, on Aids to Navigation marker (Dancy Point RFL:LLNR 7965), 6.0 mi southwest of Spuds, 5.0 mi northeast of Palatka, and 68 mi upstream from mouth.

WATER-QUALITY RECORDS

PERIOD OF RECORD -

SPECIFIC CONDUCTANCE (TOP, BOTTOM): January 1998 to January 2006 (discontinued).
SPECIFIC CONDUCTANCE (MIDDLE): April 2008 to current year.
WATER TEMPERATURE (TOP, BOTTOM): January 1998 to January 2006 (discontinued).
WATER TEMPERATURE (MIDDLE): April 2008 to current year.
DISSOLVED OXYGEN (TOP, BOTTOM): January 1998 to January 2006 (discontinued).
DISSOLVED OXYGEN (MIDDLE): April 2008 to September 2019; September 2020 to September 2021 (discontinued).
TURBIDITY (TOP): May 2002 to January 2016 (discontinued).
TURBIDITY (MIDDLE): April 2008 to September 2015 (discontinued).
TURBIDITY (BOTTOM): October 2005 to January 2016 (discontinued).
SALINITY (MIDDLE): 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. Established January 1998. Removed for channel marker reconstruction January 25, 2006. Gage relocated June 9, 2006, 4.4 mi upstream to temporary location St. John's River at Dancy Point near Palatka (294130081382000). Site reestablished on April 18, 2008. January 1998 - January 2006, top and bottom level temperature, specific conductance, and dissolved oxygen published as daily mean. April 2008 - September 2008, middle temperature, specific conductance, dissolved oxygen, and turbidity published as daily mean. October 2014 to current year, temperature, specific conductance, and dissolved oxygen, published as instantaneous maximum and minimum, and turbidity published as daily mean. Turbidity data is collected using a YSI 6136 optical turbidity probe. The manufacturers stated precision is +/-2% of the reading or +/-0.3 NTU, whichever is greater. Computed daily values between -0.3 and zero are reported as 0.0 FNU to account for this error. Formazin Nephelometric Unit values below 10 are reported to the nearest 0.1 FNU.

EXTREMES FOR PERIOD OF RECORD -

SPECIFIC CONDUCTANCE (MIDDLE): Maximum, 3060 µS/cm @ 25, May 28, 2012; minimum, 242 µS/cm @ 25 °C, Sept. 13, 2017.

WATER TEMPERATURE (MIDDLE): Maximum, 33.6 °C, Aug. 15, 2023; minimum, 6.8 °C, Jan. 12, 2010.

DISSOLVED OXYGEN (MIDDLE): Maximum, 13.7 mg/L, Apr. 25, 26, 29, 2019; minimum, 0.5 mg/L, Sept. 17, 2008.

TURBIDITY (MIDDLE): Maximum daily mean, 45 FNU, Aug. 21, 2008; minimum daily mean, 1.1 FNU, Mar. 18, 2010.

SALINITY (MIDDLE): Maximum, 0.9 ppth, June 6, 2023; minimum, 0.1 ppth, Sept. 12, 13, 2017.