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[!] During cold weather, ice effects on stage, groundwater levels, precipitation and water quality parameters at some stream-gaging stations and wells are likely. Data values reported on these pages may be significantly higher or lower than actual values. Adjustment of data for ice effects can only be done after detailed analysis. Users are encouraged to contact this office for more information on specific stream-gaging stations or wells.




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

PROVISIONAL DATA SUBJECT TO REVISION

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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.
Boating safety tips

Temperature Converter
Enter a number and click on the "Calculate" button

°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  2014-11-29
00065 Gage height 2014-07-31  2014-11-29
00010 Temperature, water, 4.1 ft from riverbed (middle) 2007-10-01  2014-11-29
00010 Temperature, water, 1.0 ft from riverbed (bottom) 2007-10-01  2014-11-29
00010 Temperature, water [7.1 ft from riverbed (top)] 2007-10-01  2014-11-29
00095 Specific cond at 25C 2007-10-01  2014-11-29
99133 NO3+NO2,water,insitu 2011-12-03  2014-11-29
63680 Turbidity, Form Neph, 5 ft from riverbed 2013-11-22  2014-11-29
00300 Dissolved oxygen, 5 ft from riverbed 2013-11-22  2014-11-29
32283 Chlorophyll, in situ, 5 ft from riverbed 2013-11-22  2014-11-29
95204 Cyanobacteria, IVF, 5 ft from riverbed 2013-11-22  2014-11-29
32295 CDOM, fluorescence, 5 ft from riverbed 2013-11-22  2014-11-29
00400 pH, 5 ft from riverbed 2013-11-22  2014-11-29
00010 Temperature, water, 5 ft from riverbed 2013-11-22  2014-11-29
00095 Specific cond at 25C, 5 ft from riverbed 2013-11-22  2014-11-29

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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: 6,080   11-29-2014  00:45 EST
Graph of  Discharge, cubic feet per second

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Daily discharge, cubic feet per second -- statistics for Nov 29 based on 84 years of record more
Min
(1931)
25th
percen-
tile
Median Most Recent
Instantaneous
Value Nov 29
Mean 75th
percen-
tile
Max
(1994)
467 2860 4910 6080 9460 10300 104000


Gage height, feet

Most recent instantaneous value: 3.51   11-29-2014  00:45 EST
Graph of  Gage height, feet

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Temperature, water, degrees Celsius, 4.1 ft from riverbed (middle)

Most recent instantaneous value: 5.2   11-29-2014  00:45 EST
Graph of  Temperature, water, degrees Celsius, 4.1 ft from riverbed (middle)

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Temperature, water, degrees Celsius, 1.0 ft from riverbed (bottom)

Most recent instantaneous value: 5.0   11-29-2014  00:45 EST
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Temperature, water, degrees Celsius, [7.1 ft from riverbed (top)]

Most recent instantaneous value: 5.1   11-29-2014  00:45 EST
Graph of  Temperature, water, degrees Celsius, [7.1 ft from riverbed (top)]

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Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius

Most recent instantaneous value: 400   11-29-2014  00:45 EST
Graph of  Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius

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Nitrate plus nitrite, water, in situ, milligrams per liter as nitrogen

Most recent instantaneous value: 1.16   11-29-2014  00:00 EST
Graph of  Nitrate plus nitrite, water, in situ, milligrams per liter as nitrogen

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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: 8.8   11-29-2014  00:00 EST
Graph of  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

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Dissolved oxygen, water, unfiltered, milligrams per liter, 5 ft from riverbed

Most recent instantaneous value: 12.9   11-29-2014  00:00 EST
Graph of  Dissolved oxygen, water, unfiltered, milligrams per liter, 5 ft from riverbed

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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: 0.9   11-29-2014  00:00 EST
Graph of  Chlorophyll, total, water, in situ, fluorometric, 650-700 nm, relative fluorescence units (RFU), 5 ft from riverbed

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Phycocyanins (cyanobacteria), water, in situ, in vivo fluorescence, in vivo fluorescence units, 5 ft from riverbed

Most recent instantaneous value: -0.05   11-29-2014  00:00 EST
Graph of  Phycocyanins (cyanobacteria), water, in situ, in vivo fluorescence, in vivo fluorescence units, 5 ft from riverbed

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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: 32.0   11-29-2014  00:00 EST
Graph of  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

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pH, water, unfiltered, field, standard units, 5 ft from riverbed

Most recent instantaneous value: 8.2   11-29-2014  00:00 EST
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Temperature, water, degrees Celsius, 5 ft from riverbed

Most recent instantaneous value: 5.2   11-29-2014  00:00 EST
Graph of  Temperature, water, degrees Celsius, 5 ft from riverbed

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Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius, 5 ft from riverbed

Most recent instantaneous value: 397   11-29-2014  00:00 EST
Graph of  Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius, 5 ft from riverbed

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