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.
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.
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