USGS Water-Year Summary for Site 02236000

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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)
	00300 Dissolved oxygen(Mean,Max.,Min.)
	63160 Stream level, NAVD88(Mean)

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

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USGS Water-Year Summary 2024

02236000 ST. JOHNS RIVER NEAR DE LAND, FL

LOCATION - Lat 29°00'29", long 81°22'58" referenced to North American Datum of 1927, in sec.38, T.17 S., R.29 E., Lake County, FL, Hydrologic Unit 03080101, in land grant 38, attached to fender pilings near center of channel under Francis P. Whitehair Bridge on State Highway 44 , 5 mi west of De Land, and 142 mi upstream from mouth.

DRAINAGE AREA - 3,066 mi².

REVISIONS HISTORY - WDR FL-75-1: Drainage area, WDR FL-96-1A: 1995.

SURFACE-WATER RECORDS

PERIOD OF RECORD - July 1932 to September 1933 (discharge measurements only), October 1933 to current year. Monthly discharge only prior to February 1934, published in WSP 1304.

GAGE - Water-stage recorder, acoustic velocity meter, and data-collection platform. Datum of gage is 0.09 ft below NGVD of 1929 and 1.05 ft below NAVD of 1988. Prior to May 28, 1936, nonrecording gage at site of former Crows Bluff Bridge about 1,000 ft downstream and May 28, 1936 to July 21, 1970, water-stage recorder at site 0.4 mi downstream at present datum. July 22, 1970 to Sept. 30, 1993, water-stage recorder at present site and datum. Oct. 1, 1993 to April 4, 2000, water-stage recorder near right bank 100 ft upstream. Oct. 1, 1959 to Sept. 30, 1975, Oct. 1, 1984 to Mar. 21, 1986, June 16 to Sept. 23, 1991, and Oct. 1, 1992 to Sept. 30, 1993, water-stage recorder for St. Johns River near Sanford (station 02234500) used as auxiliary gage for this station.

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

WATER-QUALITY RECORDS

PERIOD OF RECORD - January 1948 to December 1949, 1954, 1962, January 1966 to January 1995.

SPECIFIC CONDUCTANCE: November 1985 to September 1992, October 2000 to September 2002, December 2007 to September 2016 (discontinued). WATER TEMPERATURE: November 1985 to September 1992, October 2000 to September 2002, December 2007 to September 2016 (discontinued). DISSOLVED OXYGEN: October 2010 to September 2016 (discontinued).

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 1985 to September 1992, October 2000 to September 2003, October 2007 to September 2008; water temperature, specific conductance and dissolved oxygen published as daily mean. October 2008 to September 2014; water temperature, specific conductance and dissolved oxygen published as instantaneous maximum and minimum. October 2014 to September 2016; water temperature, specific conductance, and dissolved oxygen published as instantaneous maximum and minimum, and daily mean. Period of record extremes updated to reflect instantaneous maximum and minimum.

EXTREMES FOR PERIOD OF RECORD -

SPECIFIC CONDUCTANCE: Maximum, 2,050 µS/cm @ 25 °C, July 10, 2001; minimum, 369 µS/cm @ 25 °C, Sept. 11, 2008; maximum daily mean, 2,010 µS/cm @ 25 °C, July 10, 2001; minimum daily mean, 372 µS/cm @ 25 °C, Sept. 11, 2008.

WATER TEMPERATURE: Maximum, 33.8 °C, August 22, 2016; minimum, 8.1 °C, Jan. 12, 13, 2010; maximum daily mean, 32.5 °C, July 13, 2016; minimum daily mean, 11.6 °C, Jan. 5, 2001.

DISSOLVED OXYGEN: Maximum, 12.6 mg/L, June 21, 2011; minimum, 0.7 mg/L, May 18, 19, 21, 2013; maximum daily mean, 8.9 mg/L, July 21, 2015; minimum daily mean, 1.8 mg/L, Oct. 1, 2, 2015.