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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.
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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 7 Available Parameters for this site
  
00060 Discharge 2007-10-01  2014-07-31
00065 Gage height 2014-04-02  2014-07-31
00010 Temperature, water, 4.1 ft from riverbed (middle) 2007-10-01  2014-07-31
00010 Temperature, water, 1.0 ft from riverbed (bottom) 2007-10-01  2014-07-31
00010 Temperature, water [7.1 ft from riverbed (top)] 2007-10-01  2014-07-31
00095 Specific cond at 25C 2007-10-01  2014-07-31
99133 NO3+NO2,water,insitu 2011-12-03  2014-07-16

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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: 3,510   07-31-2014  07:45 EST
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Daily discharge, cubic feet per second -- statistics for Jul 31 based on 84 years of record more
Min
(1966)
25th
percen-
tile
Median Most Recent
Instantaneous
Value Jul 31
Mean 75th
percen-
tile
Max
(1996)
411 2110 3110 3510 4030 4760 20600


Gage height, feet

Most recent instantaneous value: 3.12   07-31-2014  07:45 EST
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Temperature, water, degrees Celsius, 4.1 ft from riverbed (middle)

Most recent instantaneous value: 24.2   07-31-2014  07:45 EST
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Temperature, water, degrees Celsius, 1.0 ft from riverbed (bottom)

Most recent instantaneous value: 24.2   07-31-2014  07:45 EST
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Temperature, water, degrees Celsius, [7.1 ft from riverbed (top)]

Most recent instantaneous value: 24.4   07-31-2014  07:45 EST
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Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius

Most recent instantaneous value: 412   07-31-2014  07:45 EST
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Page Contact Information: Maryland Water Data Support Team
Page Last Modified: 2014-07-31 09:30:08 EDT
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