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Water-Year Summary for Site 01481500

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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.
Available Parameters
00010 Temperature, water(Max.,Min.,Mean)  
00060 Discharge(Mean)  
00095 Specific cond at 25C(Max.,Min.,Mean)  
00300 Dissolved oxygen(Max.,Min.,Mean)  
00400 pH(Max.,Min.,Med.)  
63680 Turbidity, Form Neph(Min.,Max.,Mean)  
63680 Turbidity, Form Neph(Max.,Mean,Min.) [Discontinued, TS087]  

Water year 2022: 2021-10-01 to 2022-09-30

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USGS Water-Year Summary 2022
LOCATION - Lat 39°46'10.2", long 75°34'36.1" referenced to North American Datum of 1983, New Castle County, DE, Hydrologic Unit 02040205, on left bank at upstream side of Rising Sun Bridge, in Wilmington, and 4.2 mi upstream from mouth.
DRAINAGE AREA - 314 mi².
REVISIONS HISTORY - WSP 1432: 1948, 1950; WDR-US-2011: 2007-2010.
PERIOD OF RECORD - October 1946 to current year.  Prior to December 1946, monthly discharge only, published in WSP 1302.
GAGE - Water-stage recorder, crest stage gage, and concrete control. Datum of gage is 67.17 ft above North American Vertical Datum of 1988.
  • Water Year 2021: Records good, except those above 26,000 ft³/s and those for estimated discharges, which are poor.
  • Water Years 2017-2020: Records good, except those for estimated discharges, which are poor.
  • Water Years 2014-2016: Records good, except those for estimated daily discharges, which are poor.
  • Water year 2013 and prior years' accuracy statements can be found in Annual Water Data Reports.

  • Some diurnal fluctuation at low flow caused by mills upstream from station. Flow regulated since November 1973 by Marsh Creek Reservoir (see station 01480684, Marsh Creek Lake near Downington, PA), capacity 7,230,000,000 gal, about 27 mi upstream. For unregulated statistics of monthly mean data and summary statistics for water years 1947 to 1973, reference WDR MD-DE-DC-05-1. No diversion just upstream from station by plant of E. I. du Pont de Nemours & Co. since June 13, 1960. Gage relocated to left bank at upstream side of Rising Sun Bridge, October 2006 at same gage datum. U.S. Geological Survey satellite data-collection platform at station.
    EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 33,700 ft³/s, Sept. 2, 2021, gage height, 23.13 ft., September 2, 2021; minimum discharge, 30 ft³/s, Dec. 26, 1948.
    PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: October 2006 to current year. WATER TEMPERATURE: October 2006 to current year. pH: October 2006 to current year. TURBIDITY: October 2006 to current year. DISSOLVED OXYGEN: October 2006 to current year.
    COOPERATION - Funding for water-quality data collection is provided by the Delaware Department of Natural Resources and Environmental Protection, The City of Wilmington, and the United States Geological Survey.
    INSTRUMENTATION - Multi-parameter water-quality monitor, October 2006 to current year.
  • Missing data due to equipment malfunction.
  • Turbidity values greater than 1,000 formazin nepthelometric units (FNU) exceed the instrument calibration range. Values are included in the record but are presumed to have lower precision.
    TEMPERATURE: Minimum: -0.1 °C, Multiple days throughout period of record, Maximum: 31.6 °C, July 23, 2011.

    SPECIFIC CONDUCTANCE: Minimum: 55 microsiemens/cm, November 30, 2020; Maximum 1,820 microsiemens/cm, March 4, 2015.

    pH: Minimum: 6.6 standard units, October 1,2010; Maximum 9.5 standard units, April 14-16, 2016.

    DISSOLVED OXYGEN: Minimum 5.5 mg/L, April 15 and 16, 2014; Maximum 16.5 mg/L, February 28, 2015.

    TURBIDITY: Minimum 0.0 FNU Multiple days throughout period of record; Maximum 602 FNU, July 23, 2017.