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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-71-1: 1973-74(M).
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.
   Water temperature and specific conductance monitoring are supported by the 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 12 Available Parameters for this site
   
00010 Temperature, water, 4.1 ft from riverbed (middle) 2007-10-01  2018-08-17
00010 Temperature, water, 1.0 ft from riverbed (bottom) 2007-10-01  2018-08-17
00010 Temperature, water, 7.1 ft from riverbed (top) 2007-10-01  2018-08-17
00010 Temperature, water, From multiparameter sonde 2013-11-23  2018-08-17
00060 Discharge 1972-06-09  2018-08-17
00065 Gage height 2007-10-01  2018-08-17
00095 Specific cond at 25C, 7.1 ft from riverbed (top) 2007-10-01  2018-08-17
00095 Specific cond at 25C, From multiparameter sonde 2013-11-23  2018-08-17
00300 Dissolved oxygen, From multiparameter sonde 2013-11-23  2018-08-17
00400 pH, From multiparameter sonde 2013-11-23  2018-08-17
63680 Turbidity, Form Neph, From multiparameter sonde 2013-11-23  2018-08-17
99133 NO3+NO2,water,insitu 2011-12-03  2018-08-17

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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)
Most recent instantaneous value: 27.5 08-17-2018   17:45 EST
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Temperature, water, degrees Celsius, 4.1 ft from riverbed (middle)
Most recent instantaneous value: 27.2 08-17-2018   17:45 EST
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Temperature, water, degrees Celsius, 7.1 ft from riverbed (top)
Most recent instantaneous value: 26.8 08-17-2018   17:45 EST
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Temperature, water, degrees Celsius, From multiparameter sonde
Most recent instantaneous value: 27.0 08-17-2018   17:30 EST
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Discharge, cubic feet per second
Most recent instantaneous value: 12400 08-17-2018   17:45 EST
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Daily discharge, cubic feet per second -- statistics for Aug 17 based on 88 years of record more
Min
(1999)		 25th
percen-
tile		 Median 75th
percen-
tile		 Mean Most Recent
Instantaneous
Value Aug 17		 Max
(1996)
274 1720 2630 3910 3970 12400 30500

Gage height, feet
Most recent instantaneous value: 4.20 08-17-2018   17:45 EST
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Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius, 7.1 ft from riverbed (top)
Most recent instantaneous value: 314 08-17-2018   17:45 EST
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Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius, From multiparameter sonde
Most recent instantaneous value: 312 08-17-2018   17:30 EST
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Dissolved oxygen, water, unfiltered, milligrams per liter, From multiparameter sonde
Most recent instantaneous value: 8.5 08-17-2018   17:30 EST
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pH, water, unfiltered, field, standard units, From multiparameter sonde
Most recent instantaneous value: 8.3 08-17-2018   17:30 EST
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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
Most recent instantaneous value: 10.1 08-17-2018   17:30 EST
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Nitrate plus nitrite, water, in situ, milligrams per liter as nitrogen
Most recent instantaneous value: 1.26 08-17-2018   17:30 EST
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