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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2024
01474703 DELAWARE RIVER AT FORT MIFFLIN AT PHILADELPHIA, PA
LOCATION - Lat 39°52'45", long 75°12'11" referenced to North American Datum of 1927, Philadelphia County, PA, Hydrologic Unit 02040202, on right bank at outer end of L-shaped pier at Fort Mifflin, 0.4 mi downstream from mouth of Schuylkill River, and at Philadelphia.
DRAINAGE AREA - 9,971 mi².
SURFACE-WATER RECORDS
COOPERATION - Station established and maintained by the U.S. Geological Survey in cooperation with the Delaware River Basin Commission.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Water years 1970-76, 1981 to current.
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: July 1970 to December 1971, February 1981 to current year.
WATER TEMPERATURE: June 1972 to June 1976, February 1981 to current year.
INSTRUMENTATION - Water-quality monitor July 1970 to June 1976 and since Feb. 1981. Satellite telemetry at station.
REMARKS - Water year 2015 specific conductance and water temperature record rated good. Data collected only during drought conditions and at the request of the Delaware River Basin Commission.
EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum, 1,340 microsiemens, Aug. 11, 1999; minimum, 90 microsiemens, Apr. 11, 17, 19, 29, 1983, Apr. 29, 1984.
WATER TEMPERATURE: Maximum, 31.0°C, Aug. 4-6, 13, 1975; minimum, 0.4°C, Jan. 31, 2022.
