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

PROVISIONAL DATA SUBJECT TO REVISION

Click to hidestation-specific text
Click for larger image LOCATION.--Lat 38°56'59.2", long 77°07'39.5", Montgomery County, MD, Hydrologic Unit 02070008, on left bank just upstream from Little Falls Dam, 1 mi upstream from District of Columbia boundary line, 1.2 mi upstream from Chain Bridge, 1.8 mi east of Langley, Fairfax County, and at mile 117.4.
DRAINAGE AREA.--11,560 mi2.
REVISIONS HISTORY.--
  • WSP 726: Drainage area.
  • WDR MD-DE-75-1: 1973-74(M).
  • https://waterdata.usgs.gov/nwis/dv/?site_no=01646500: 2018.
  • https://waterdata.usgs.gov/nwis/uv/?site_no=01646500: 2021.
  • Discharge for Measurement 385 made on 06/25/2021 was revised on 09/22/2021 due to an error in computation.
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 Jun 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 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.
Boating safety tips
This station managed by the MD-DE-DC Water Science Center Baltimore office.

Available Parameters Available Period
  
2019-07-24  2025-05-24
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  2025-05-24
2007-10-01  2025-05-24
2019-07-24  2025-05-24
2007-10-01  2019-10-01
2013-11-23  2019-05-27
2019-07-24  2025-05-24
2013-11-23  2019-05-27
2019-07-24  2025-05-24
2013-11-23  2019-05-27
2019-07-24  2025-05-24
2013-11-23  2019-05-27
2019-07-24  2025-05-24
2011-12-03  2019-06-11







 (14)
 
  -- or --

 

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

Temperature, water, degrees Celsius, 1.0 ft from riverbed (bottom), [Discontinued]
Most recent instantaneous value: 24.0 10-01-2019   12:15 EDT
Graph of Temperature, water, degrees Celsius, [Discontinued]

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Daily temperature, water, degrees celsius -- statistics for May 24 based on 12 water years of record more
Most Recent
Instantaneous
Value May 24		 Min
(2008)		 25th
percen-
tile		 Mean Median 75th
percen-
tile		 Max
(2009)
-- unavailable -- 15.5 19 20.5 20.9 22.7 23.5

Temperature, water, degrees Celsius, 4.1 ft from riverbed (middle), [Discontinued]
Most recent instantaneous value: 24.3 10-01-2019   12:15 EDT
Graph of Temperature, water, degrees Celsius, [Discontinued]

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Daily temperature, water, degrees celsius -- statistics for May 24 based on 12 water years of record more
Most Recent
Instantaneous
Value May 24		 Min
(2008)		 25th
percen-
tile		 Mean Median 75th
percen-
tile		 Max
(2009)
-- unavailable -- 16.4 19 20.7 20.7 23 24.0

Temperature, water, degrees Celsius, 7.1 ft from riverbed (top), [Discontinued]
Most recent instantaneous value: 23.9 10-01-2019   12:30 EDT
Graph of Temperature, water, degrees Celsius, [Discontinued]

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Daily temperature, water, degrees celsius -- statistics for May 24 based on 31 water years of record more
Most Recent
Instantaneous
Value May 24		 Min
(2003)		 25th
percen-
tile		 Median Mean 75th
percen-
tile		 Max
(1991)
-- unavailable -- 15.2 19 20.3 20.7 22.5 26.5

Temperature, water, degrees Celsius, From multiparameter sonde
Most recent instantaneous value: 17.2 05-24-2025   12:45 EDT
Graph of Temperature, water, degrees Celsius

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Daily temperature, water, degrees celsius -- statistics for May 24 based on 5 water years of record more
Most Recent
Instantaneous
Value May 24		 Min
(2020)		 25th
percen-
tile		 Median Mean 75th
percen-
tile		 Max
(2021)
17.2 20.6 21.4 23 23.1 24.7 25.0

Temperature, water, degrees Celsius, From multiparameter sonde, [Discontinued]
Most recent instantaneous value: 24.8 05-27-2019   15:00 EDT
Graph of Temperature, water, degrees Celsius, [Discontinued]

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Daily temperature, water, degrees celsius -- statistics for May 24 based on 5 water years of record more
Min
(2016)		 25th
percen-
tile		 Median Mean 75th
percen-
tile		 Max
(2019)		 Most Recent
Instantaneous
Value May 24
17.8 18.4 19.1 19.5 20.9 21.7 24.8

Discharge, cubic feet per second
Most recent instantaneous value: 20600 05-24-2025   12:45 EDT
Graph of Discharge, cubic feet per second

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Daily discharge, cubic feet per second -- statistics for May 24 based on 95 water years of record more
Min
(1930)		 25th
percen-
tile		 Median Mean 75th
percen-
tile		 Most Recent
Instantaneous
Value May 24		 Max
(1942)
3320 6300 10900 14500 15900 20600 130000

Gage height, feet
Most recent instantaneous value: 4.96 05-24-2025   12:45 EDT
Graph of Gage height, feet

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