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  2024-07-22
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  2024-07-22
2007-10-01  2024-07-22
2019-07-24  2024-07-22
2007-10-01  2019-10-01
2013-11-23  2019-05-27
2019-07-24  2024-07-22
2013-11-23  2019-05-27
2019-07-24  2024-07-22
2013-11-23  2019-05-27
2019-07-24  2024-07-22
2013-11-23  2019-05-27
2019-07-24  2024-07-22
2011-12-03  2019-06-11







 (7)
 

  -- or --

 


 

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

Temperature, water, degrees Celsius, 1.0 ft from riverbed (bottom), [Discontinued]
 
-- Data temporarily unavailable for the time period specified --

Temperature, water, degrees Celsius, 4.1 ft from riverbed (middle), [Discontinued]
 
-- Data temporarily unavailable for the time period specified --

Temperature, water, degrees Celsius, 7.1 ft from riverbed (top), [Discontinued]
 
-- Data temporarily unavailable for the time period specified --


Temperature, water, degrees Celsius, From multiparameter sonde

Most recent instantaneous value: 29.5 07-22-2024   12:45 EDT
Graph of

Add up to 2 more sites and replot for "Temperature, water, degrees Celsius, From multiparameter sonde"

?
 


Create presentation-quality / stand-alone graph.   Subscribe to WaterAlert      

See this graph on the Monitoring Location Pages



Temperature, water, degrees Celsius, From multiparameter sonde, [Discontinued]
 
-- Data temporarily unavailable for the time period specified --


Discharge, cubic feet per second

Most recent instantaneous value: 1100 07-22-2024   12:45 EDT
Graph of

Add up to 2 more sites and replot for "Discharge, cubic feet per second"

?
 


Create presentation-quality / stand-alone graph.   Subscribe to WaterAlert      

See this graph on the Monitoring Location Pages


Daily discharge, cubic feet per second -- statistics for Jul 22 based on 94 water years of record more
Min
(1999)
Most Recent
Instantaneous
Value Jul 22
25th
percen-
tile
Median 75th
percen-
tile
Mean Max
(2018)
295 1100 2170 3120 4640 4820 35800


Gage height, feet

Most recent instantaneous value: 2.58 07-22-2024   12:45 EDT
Graph of

Add up to 2 more sites and replot for "Gage height, feet"

?
 


Create presentation-quality / stand-alone graph.   Subscribe to WaterAlert      

See this graph on the Monitoring Location Pages



Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius, 7.1 ft from riverbed (top), [Discontinued]
 
-- Data temporarily unavailable for the time period specified --


Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius, From multiparameter sonde

Most recent instantaneous value: 379 07-22-2024   12:45 EDT
Graph of

Add up to 2 more sites and replot for "Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius, From multiparameter sonde"

?
 


Create presentation-quality / stand-alone graph.   Subscribe to WaterAlert      

See this graph on the Monitoring Location Pages



Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius, From multiparameter sonde, [Discontinued]
 
-- Data temporarily unavailable for the time period specified --


Dissolved oxygen, water, unfiltered, milligrams per liter, From multiparameter sonde

Most recent instantaneous value: 10.4 07-22-2024   12:45 EDT
Graph of

Add up to 2 more sites and replot for "Dissolved oxygen, water, unfiltered, milligrams per liter, From multiparameter sonde"

?
 


Create presentation-quality / stand-alone graph.   Subscribe to WaterAlert      

See this graph on the Monitoring Location Pages



Dissolved oxygen, water, unfiltered, milligrams per liter, From multiparameter sonde, [Discontinued]
 
-- Data temporarily unavailable for the time period specified --


pH, water, unfiltered, field, standard units, From multiparameter sonde

Most recent instantaneous value: 8.5 07-22-2024   12:45 EDT
Graph of

Add up to 2 more sites and replot for "pH, water, unfiltered, field, standard units, From multiparameter sonde"

?
 


Create presentation-quality / stand-alone graph.   Subscribe to WaterAlert      

See this graph on the Monitoring Location Pages



pH, water, unfiltered, field, standard units, From multiparameter sonde, [Discontinued]
 
-- Data temporarily unavailable for the time period specified --


Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU), From multiparameter sonde

Most recent instantaneous value: 5.7 07-22-2024   12:45 EDT
Graph of

Add up to 2 more sites and replot for "Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU), From multiparameter sonde"

?
 


Create presentation-quality / stand-alone graph.   Subscribe to WaterAlert      

See this graph on the Monitoring Location Pages



Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU), From multiparameter sonde, [Discontinued]
 
-- Data temporarily unavailable for the time period specified --


Nitrate plus nitrite, water, in situ, milligrams per liter as nitrogen, SUNA

Most recent instantaneous value: 0.07 07-22-2024   13:00 EDT
Graph of

Add up to 2 more sites and replot for "Nitrate plus nitrite, water, in situ, milligrams per liter as nitrogen, SUNA"

?
 


Create presentation-quality / stand-alone graph.   Subscribe to WaterAlert      

See this graph on the Monitoring Location Pages



Nitrate plus nitrite, water, in situ, milligrams per liter as nitrogen, SUNA, [Discontinued]
 
-- Data temporarily unavailable for the time period specified --