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Water-Year Summary for Site 01591610

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00010 Temperature, water(Max.,Min.,Mean) [Discontinued]  
00060 Discharge(Mean)  

Water year 2021: 2021-10-01 to 2022-09-30

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USGS Water-Year Summary 2021
LOCATION - Lat 39°11'31.9", long 77°00'15.8" referenced to North American Datum of 1983, Montgomery County, MD, Hydrologic Unit 02060006, on right bank at Brighton Dam, 500 ft downstream from Triadelphia Reservoir, 1.3 mi east of Brighton, and 92 mi upstream from mouth.
DRAINAGE AREA - 78.6 mi².
REVISIONS HISTORY - https://waterdata.usgs.gov/nwis/dv/?site_no=01591610: 2013
PERIOD OF RECORD - October 1980 to current year.
GAGE - Water-stage recorder, crest-stage gage, and concrete control. Datum of gage is 302.98 ft above North American Vertical Datum of 1988. June 1978 to October 1980, nonrecording gage 300 ft upstream on left bank at different gage datum.
  • Water Years 2018-2020: Records fair, except those above 500 ft³/s, and those for estimated discharges, which are poor.
  • Water Year 2017: Records fair, except those above 500 ft³/s, which are poor.
  • Water Year 2016: Records good, except those above 2,000 ft³/s, which are fair.
  • Water Years 2014-2015: Records good, except those above 2,000 ft³/s, which are fair, and those for estimated daily discharges, which are poor.
  • Water Year 2013 and prior years’ accuracy statements can be found in Annual Water Data Reports.

  • Flow completely regulated by Triadelphia Reservoir, 500 ft upstream, usable capacity, 6,200,000,000 gal; no dead storage. U.S. Geological Survey satellite data-collection platform at station.
    EXTREMES OUTSIDE PERIOD OF RECORD - Flood of June 22, 1972, reached a discharge of 17,800 ft³/s. Data provided by Washington Suburban Sanitary Commission.
    PERIOD OF DAILY RECORD - April 2013 to current year.
    INSTRUMENTATION - Water-temperature sensor, April 2013 to current year.
    REMARKS - Missing record due to instrument malfunction or site servicing.
    EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 27.9°C, July 24, 2013; minimum, 0.3°C, Feb 24, 2015.