USGS Current Conditions for USGS 01646500 POTOMAC RIVER NEAR WASH, DC LITTLE FALLS PUMP STA x

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

PROVISIONAL DATA SUBJECT TO REVISION

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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
All 18 Available Parameters for this site
00010 Temperature, water, From multiparameter sonde	2019-07-24	2024-11-21
00010 Temperature, water, 4.1 ft from riverbed (middle) [Discontinued]	2007-10-01	2019-10-01
00010 Temperature, water, 1.0 ft from riverbed (bottom) [Discontinued]	2007-10-01	2019-10-01
00010 Temperature, water, 7.1 ft from riverbed (top) [Discontinued]	2007-10-01	2019-10-01
00010 Temperature, water, From multiparameter sonde [Discontinued]	2013-11-23	2019-05-27
00060 Discharge	1972-06-09	2024-11-21
00065 Gage height	2007-10-01	2024-11-21
00095 Specific cond at 25C, From multiparameter sonde	2019-07-24	2024-11-21
00095 Specific cond at 25C, 7.1 ft from riverbed (top) [Discontinued]	2007-10-01	2019-10-01
00095 Specific cond at 25C, From multiparameter sonde [Discontinued]	2013-11-23	2019-05-27
00300 Dissolved oxygen, From multiparameter sonde	2019-07-24	2024-11-21
00300 Dissolved oxygen, From multiparameter sonde [Discontinued]	2013-11-23	2019-05-27
00400 pH, From multiparameter sonde	2019-07-24	2024-11-21
00400 pH, From multiparameter sonde [Discontinued]	2013-11-23	2019-05-27
63680 Turbidity, Form Neph, From multiparameter sonde [(2)]	2019-07-24	2024-11-21
63680 Turbidity, Form Neph, From multiparameter sonde [Discontinued]	2013-11-23	2019-05-27
99133 NO3+NO2,water,insitu, SUNA	2019-07-24	2024-11-21
99133 NO3+NO2,water,insitu, SUNA [Discontinued]	2011-12-03	2019-06-11

Days (7)

-- or --
Begin date

End date

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

Discharge, cubic feet per second

Most recent instantaneous value: 2700 11-21-2024 10:45 EST

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**Daily discharge, cubic feet per second -- statistics for Nov 21 based on 94 water years of record more**
Min (1932)	25th percen- tile	Most Recent Instantaneous Value Nov 21	Median	Mean	75th percen- tile	Max (2004)
815	2340	2700	3990	7370	8530	80200

Gage height, feet

Most recent instantaneous value: 2.97 11-21-2024 10:45 EST

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