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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  2014-10-30
00065 Gage height 2014-07-02  2014-10-30

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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: 2,440   10-30-2014  06:45 EST
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Daily discharge, cubic feet per second -- statistics for Oct 30 based on 119 years of record more
Min
(1931)
25th
percen-
tile
Most Recent
Instantaneous
Value Oct 30
Median 75th
percen-
tile
Mean Max
(1938)
623 1760 2440 2520 5550 5990 154000


Gage height, feet

Most recent instantaneous value: 1.27   10-30-2014  06:45 EST
Graph of  Gage height, feet

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