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* IMPORTANT: Next Generation Station Page

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.
REVISIONS HISTORY.--WSP 726: Drainage area. WDR MD-DE-75-1: 1973-74(M).
   https://waterdata.usgs.gov/nwis/dv/?site_no=01646500: 2018.
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, at site then in use; minimum discharge, 66 ft3/s, Sept. 9, 1966.
   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.
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 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
This station managed by the MD-DE-DC Water Science Center Baltimore office.

Available Parameters Available Period
  
2019-07-24  2020-02-20
2007-10-01  2019-10-01
2007-10-01  2019-10-01
2007-10-01  2019-10-01
2013-11-23  2019-05-27
1972-06-09  2020-02-20
2007-10-01  2020-02-20
2019-07-24  2020-02-20
2007-10-01  2019-10-01
2013-11-23  2019-05-27
2019-07-24  2020-02-20
2013-11-23  2019-05-27
2019-07-24  2020-02-20
2013-11-23  2019-05-27
2019-07-24  2020-02-20
2013-11-23  2019-05-27
2019-07-24  2020-02-20
2011-12-03  2019-07-10







 (7)
 

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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: 11500 02-20-2020   20:45 EST
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Daily discharge, cubic feet per second -- statistics for Feb 20 based on 89 water years of record more
Min
(2002)
25th
percen-
tile
Most Recent
Instantaneous
Value Feb 20
Median Mean 75th
percen-
tile
Max
(1998)
1680 7520 11500 12800 17200 22500 103000