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  • USGS 01646500 POTOMAC RIVER NEAR WASH, DC LITTLE FALLS PUMP STA

    PROVISIONAL DATA SUBJECT TO REVISION

    Click to hidestation-specific text

     
    DRAINAGE AREA.--11,560 mi2.
    PERIOD OF RECORD.--March 1930 to current year.
    GAGE.--Water-stage recorder, crest-stage gage, and concrete control. Datum of gage is 37.20 ft above 
       North American Vertical Datum of 1988. Prior to June 7, 1930, nonrecording gage, and June 7, 1930, to Jan. 22, 1965,
       water-stage recorder at site 1 mi upstream on right bank at same gage datum.
    REMARKS.--Diversions since June 1959. U.S. Geological Survey satellite data-collection platform at station. 
    EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 484,000 ft3/s, Mar. 19, 1936,
       gage height, 28.1 ft, site then in use; minimum daily discharge observed at gaging station, 121 ft3/s, Sept.
       9, 1966, does not include diversion of 489 ft3/s for municipal use; minimum daily discharge (adjusted),
       601 ft3/s, Sept. 10, 1966, includes diversion of 449 ft3/s for municipal use;
       minimum discharge, 66 ft3/s,  Sept. 9, 1966.
    EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of June 2, 1889, was of approximately the same magnitude
       as that of March 19, 1936.
    COOPERATION.--Funding for the operation of this station is provided by the Metropolitan Washington Council of
       Governments, and the U.S. Geological Survey. Access to gage site provided by the Baltimore District,
       U.S. Army Corps of Engineers. Water temperature and specific conductance monitoring are supported
       by the U.S. Army Corps of Engineers.
    
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    Temperature Converter
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    °F   =   °C

    Revised Records: Prior revisions to drainage area are documented in Water Supply-Paper 726. Prior revisions to maximum discharge are documented in Water-Data Report WDR-MD-DE-75-1.

    This station managed by the MD-DE-DC Water Science Center, Baltimore office.

    Available Parameters Available Period
    All 15 Available Parameters for this site
      
    00060 Discharge 2007-10-01  2014-08-28
    00065 Gage height 2014-04-30  2014-08-28
    00010 Temperature, water, 4.1 ft from riverbed (middle) 2007-10-01  2014-08-28
    00010 Temperature, water, 1.0 ft from riverbed (bottom) 2007-10-01  2014-08-28
    00010 Temperature, water [7.1 ft from riverbed (top)] 2007-10-01  2014-08-28
    00095 Specific cond at 25C 2007-10-01  2014-08-28
    99133 NO3+NO2,water,insitu 2011-12-03  2014-08-28
    63680 Turbidity, Form Neph, 5 ft from riverbed 2013-11-22  2014-08-28
    00300 Dissolved oxygen, 5 ft from riverbed 2013-11-22  2014-08-28
    32283 Chlorophyll, in situ, 5 ft from riverbed 2013-11-22  2014-08-28
    95204 Cyanobacteria, IVF, 5 ft from riverbed 2013-11-22  2014-08-28
    32295 CDOM, fluorescence, 5 ft from riverbed 2013-11-22  2014-08-28
    00400 pH, 5 ft from riverbed 2013-11-22  2014-08-28
    00010 Temperature, water, 5 ft from riverbed 2013-11-22  2014-08-28
    00095 Specific cond at 25C, 5 ft from riverbed 2013-11-22  2014-08-28

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    Summary of all available data for this site
    Instantaneous-data availability statement


    Discharge, cubic feet per second

    Most recent instantaneous value: 2,800   08-28-2014  19:45 EST
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    Daily discharge, cubic feet per second -- statistics for Aug 28 based on 84 years of record more
    Min
    (1966)
    25th
    percen-
    tile
    Median Most Recent
    Instantaneous
    Value Aug 28
    Mean 75th
    percen-
    tile
    Max
    (1937)
    379 1450 2510 2800 4520 4940 64800


    Gage height, feet

    Most recent instantaneous value: 2.99   08-28-2014  19:45 EST
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    Temperature, water, degrees Celsius, 4.1 ft from riverbed (middle)

    Most recent instantaneous value: 27.8   08-28-2014  19:45 EST
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    Temperature, water, degrees Celsius, 1.0 ft from riverbed (bottom)

    Most recent instantaneous value: 27.7   08-28-2014  19:45 EST
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    Temperature, water, degrees Celsius, [7.1 ft from riverbed (top)]

    Most recent instantaneous value: 27.8   08-28-2014  19:45 EST
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    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius

    Most recent instantaneous value: 394   08-28-2014  19:45 EST
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    Nitrate plus nitrite, water, in situ, milligrams per liter as nitrogen

    Most recent instantaneous value: 1.02   08-28-2014  19:00 EST
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    Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU), 5 ft from riverbed

    Most recent instantaneous value: 5.5   08-28-2014  19:00 EST
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    Dissolved oxygen, water, unfiltered, milligrams per liter, 5 ft from riverbed

    Most recent instantaneous value: 9.3   08-28-2014  19:00 EST
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    Chlorophyll, total, water, in situ, fluorometric, 650-700 nm, relative fluorescence units (RFU), 5 ft from riverbed

    Most recent instantaneous value: 1.1   08-28-2014  19:00 EST
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    Phycocyanins (cyanobacteria), water, in situ, in vivo fluorescence, in vivo fluorescence units, 5 ft from riverbed

    Most recent instantaneous value: -0.38   08-28-2014  19:00 EST
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    Colored dissolved organic matter (CDOM), water, in situ, single band excitation, fluorescence emission, parts per billion quinine sulfate equivalents (ppb QSE), 5 ft from riverbed

    Most recent instantaneous value: 17.6   08-28-2014  19:00 EST
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    pH, water, unfiltered, field, standard units, 5 ft from riverbed

    Most recent instantaneous value: 8.6   08-28-2014  19:00 EST
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    Temperature, water, degrees Celsius, 5 ft from riverbed

    Most recent instantaneous value: 27.9   08-28-2014  19:00 EST
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    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius, 5 ft from riverbed

    Most recent instantaneous value: 397   08-28-2014  19:00 EST
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