USGS Water-Year Summary 2023
01482800 DELAWARE RIVER AT REEDY ISLAND JETTY, DE
LOCATION - Lat 39°30'03", long 75°34'07" referenced to North American Datum of 1927, New Castle County, DE, Hydrologic Unit 02040205, Hydrologic Unit 02040205, on dock on streamward side of jetty about 0.4 mi downstream from Reedy Island near Port Penn.
DRAINAGE AREA - 11,200 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - Water year 1963 to current year.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: October 1963 to current year.
pH: February 1970 to current year.
WATER TEMPERATURES: February 1970 to current year.
DISSOLVED OXYGEN: February 1970 to current year.
TURBIDITY: April 2009 to December 2011 (discontinued).
INSTRUMENTATION - Water-quality monitor since February 1970. Probes interfaced with a data collection platform since the 1986 water year. Probes placed in situ since July 1998.
EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum, 35,600 microsiemens, Nov 15, 1978; minimum, 100 microsiemens, several days in 1969, 1970, 1974 and 1979.
pH: Maximum, 8.9, Mar 4, 1980; minimum, 5.4, Dec 31, 1972.
WATER TEMPERATURE: Maximum, 32.5°C, Jul 23, 1987; minimum, -0.8°C, Feb 6, 17, 2015. (Liquid water can exist at temperatures below freezing when mineral content is high.)
TURBIDITY: Maximum, 820 FNU, Nov 19, 2009; minimum, 6.9 FNU, Jul 21, 2010.
DISSOLVED OXYGEN: Maximum, 17.1 mg/L, Dec 16, 19, 1976; minimum, 0.3 mg/L, Sep 16, 17, 1971.