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Water-Year Summary for Site 01474703

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[!] Over the next year, the USGS Pennsylvania Water Science Center will be updating the geodetic vertical elevation (gage datum) for many locations. Click HERE for additional information including a current list of streamgages with upcoming datum changes. This update in gage datum does not affect the location of the streamgage, nor the observed local gage height or discharge recorded at the streamgage.


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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.
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Available Parameters
00010 Temperature, water(Max.,Min.,Mean)  
00095 Specific cond at 25C(Max.,Min.,Mean)  

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