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  2024-06-24
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  2024-06-24
2007-10-01  2024-06-24
2019-07-24  2024-06-24
2007-10-01  2019-10-01
2013-11-23  2019-05-27
2019-07-24  2024-06-24
2013-11-23  2019-05-27
2019-07-24  2024-06-24
2013-11-23  2019-05-27
2019-07-24  2024-06-24
2013-11-23  2019-05-27
2019-07-24  2024-06-24
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 Jun 24 based on 12 water years of record more
Most Recent
Instantaneous
Value Jun 24
Min
(2009)
25th
percen-
tile
Median Mean 75th
percen-
tile
Max
(2010)
-- unavailable -- 24.8 25.6 26.8 27.1 28.1 30.9


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 Jun 24 based on 12 water years of record more
Most Recent
Instantaneous
Value Jun 24
Min
(2009)
25th
percen-
tile
Mean Median 75th
percen-
tile
Max
(2010)
-- unavailable -- 25.1 25.8 27.3 27.3 28.2 31.1


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 Jun 24 based on 30 water years of record more
Most Recent
Instantaneous
Value Jun 24
Min
(2003)
25th
percen-
tile
Mean Median 75th
percen-
tile
Max
(2010)
-- unavailable -- 19.4 25 26.1 26.4 27.6 31.4


Temperature, water, degrees Celsius, From multiparameter sonde

Most recent instantaneous value: 30.7 06-24-2024   22:45 EDT
Graph of  Temperature, water, degrees Celsius

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Daily temperature, water, degrees celsius -- statistics for Jun 24 based on 2 water years of record more
Min
(2023)
Mean Median Max
(2021)
Most Recent
Instantaneous
Value Jun 24
22.6 23.8 23.8 25.0 30.7


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 Jun 24 based on 5 water years of record more
Most Recent
Instantaneous
Value Jun 24
Min
(2018)
25th
percen-
tile
Median Mean 75th
percen-
tile
Max
(2017)
-- unavailable -- 21.6 23.6 25.7 25.8 28.1 28.3


Discharge, cubic feet per second

Most recent instantaneous value: 1550 06-24-2024   22:45 EDT
Graph of  Discharge, cubic feet per second

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Daily discharge, cubic feet per second -- statistics for Jun 24 based on 94 water years of record more
Min
(1999)
Most Recent
Instantaneous
Value Jun 24
25th
percen-
tile
Median 75th
percen-
tile
Mean Max
(1972)
1190 1550 3640 5670 8540 11300 334000


Gage height, feet

Most recent instantaneous value: 2.74 06-24-2024   22:45 EDT
Graph of  Gage height, feet

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