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

PROVISIONAL DATA SUBJECT TO REVISION

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DRAINAGE AREA.--11,560 mi2.
PERIOD OF RECORD.--March 1930 to current year.
REVISIONS HISTORY.--WSP 726: Drainage area. WDR MD-DE-75-1: 1973-74(M).
   https://waterdata.usgs.gov/nwis/dv/?site_no=01646500: 2018.
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 June 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 FOR PERIOD OF RECORD.--Maximum discharge, 484,000 ft3/s, Mar. 19, 1936,
   gage height, 28.1 ft, at site then in use; minimum discharge, 66 ft3/s, Sept. 9, 1966.
   Minimum daily discharge observed at gaging station, 121 ft3/s, Sept. 9, 1966, does not include
   diversion of 489 ft3/s for municipal use; minimum daily discharge (adjusted), 601 ft3/s,
   Sept. 10, 1966, includes diversion of 449 ft3/s for municipal use.
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  2020-08-03
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  2020-08-03
2007-10-01  2020-08-03
2019-07-24  2020-08-03
2007-10-01  2019-10-01
2013-11-23  2019-05-27
2019-07-24  2020-08-03
2013-11-23  2019-05-27
2019-07-24  2020-08-03
2013-11-23  2019-05-27
2019-07-24  2020-08-03
2013-11-23  2019-05-27
2019-07-24  2020-08-03
2011-12-03  2019-06-11







 (7)
 

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

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

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

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


Temperature, water, degrees Celsius, From multiparameter sonde

Most recent instantaneous value: 30.1 08-03-2020   23:00 EDT
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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: 2810 08-03-2020   22:45 EDT
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Daily discharge, cubic feet per second -- statistics for Aug 3 based on 90 water years of record more
Min
(1966)
25th
percen-
tile
Median Most Recent
Instantaneous
Value Aug 3
Mean 75th
percen-
tile
Max
(1996)
288 2030 2800 2810 4780 5290 38900


Gage height, feet

Most recent instantaneous value: 3.00 08-03-2020   22:45 EDT
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Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius, 7.1 ft from riverbed (top)
 
-- 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: 337 08-03-2020   23:00 EDT
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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: 8.2 08-03-2020   23:00 EDT
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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: 8.3 08-03-2020   23:00 EDT
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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: 5.6 08-03-2020   23:00 EDT
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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: 0.57 08-03-2020   22:45 EDT
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Nitrate plus nitrite, water, in situ, milligrams per liter as nitrogen, SUNA, [discontinued]
 
-- Data temporarily unavailable for the time period specified --