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    All Maryland-Delaware-District of Columbia times are reported in Eastern Standard Time (EST). To convert to Eastern Daylight Time (EDT) add 1 hour.


    USGS 01638500 POTOMAC RIVER AT POINT OF ROCKS, MD

    PROVISIONAL DATA SUBJECT TO REVISION

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    LOCATION.--Lat 39°16'24.9", long 77°32'35.2", Frederick County, Hydrologic Unit 02070008,
       on left bank at downstream side of bridge on U.S. Highway 15 at Point of Rocks, 0.3 mi downstream from
       Catoctin Creek (Virginia), 6 mi upstream from Monocacy River, and at mile 159.5.
    DRAINAGE AREA.--9,651 mi2.
    PERIOD OF RECORD.--February 1895 to current year.
    REVISED RECORDS.--WSP 192:  1895-1905.  WSP 1432:  1899, 1901-2, 1904-5, 1912, 1914(M), 1915, 1917(M),
       1918, 1919(M), 1920, 1921-23(M), 1924, 1925-28(M), 1930(M).
    GAGE.--Water-stage recorder and crest-stage gage.  Datum of gage is 199.92 ft above North American 
       Vertical Datum of 1988. Prior to Oct. 28, 1929, nonrecording gage at same site. Prior to Sept. 2, 1902, 
       at gage datum about 0.45 ft higher. 
    REMARKS.--Low flow affected slightly from 1913 to July 1981 by Stony River Reservoir; since December 1950
       by Savage River Reservoir (see station 01597500); and since July 1981 by Jennings Randolph Lake. Low flow
       affected extensively at times by run-of-the-river hydroelectric plants.  National Weather Service gage-height
       telemeter at station.
       U.S. Geological Survey satellite data-collection platform at station.
    EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 480,000 ft3/s, Mar. 19, 1936,
       gage height, 41.03 ft; minimum discharge, 530 ft3/s, Sept. 11, 12, 1966.
    EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of June 2, 1889, reached a stage of 40.2 ft, from floodmarks,
       discharge, about 460,000 ft3/s.
    COOPERATION.--Funding for the operation of this station is provided by the Interstate Commission on the Potomac
       River Basin, and the U.S. Geological Survey. 
    
    Boating safety tips
    This station managed by the MD-DE-DC Water Science Center, Frostburg office.

    Available Parameters Available Period
    All 2 Available Parameters for this site
      
    00060 Discharge 2007-10-01  2014-08-20
    00065 Gage height 2014-04-22  2014-08-20

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


    Discharge, cubic feet per second

    Most recent instantaneous value: 2,490   08-20-2014  10:45 EST
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    Daily discharge, cubic feet per second -- statistics for Aug 20 based on 119 years of record more
    Min
    (1930)
    25th
    percen-
    tile
    Most Recent
    Instantaneous
    Value Aug 20
    Median 75th
    percen-
    tile
    Mean Max
    (1955)
    712 1760 2490 2520 3880 5380 190000


    Gage height, feet

    Most recent instantaneous value: 1.29   08-20-2014  10:45 EST
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