PROVISIONAL DATA SUBJECT TO REVISION

LOCATION.--Lat 39°26'59.2", long 77°43'48.7", Washington County, Hydrologic Unit 02070004,
   on left bank 400 ft downstream from Burnside Bridge, 1.0 mi southeast of Sharpsburg, and 4.0 mi
   upstream from mouth. 
DRAINAGE AREA.--281 mi2.
PERIOD OF RECORD.--June 1897 to September 1905, August 1928 to current year. Monthly discharge only for
   some periods, published in WSP 1302.
REVISED RECORDS.--WSP 192:  1897-1905.  WSP 726:  Drainage area.  WSP  1432:  1929-31(M), 1933, 1935(M),
   1937(M), 1949(M), 1952(M).
GAGE.--Water-stage recorder and crest-stage gage. Concrete control since Mar. 29, 1934.  Datum of gage is 311.05 ft above
   National Geodetic Vertical Datum of 1929. June 24, 1897, to Aug. 25, 1905, nonrecording gage a few hundred
   feet downstream from Middle Bridge, 1.2 mi upstream at datum 12 ft higher.  Aug. 21, 1928, to July 13, 1933,
   nonrecording gage at Burnside Bridge, 0.1 mi upstream at present datum.
REMARKS.--Since 1928 records include pumpage from the Potomac River for municipal supply of Hagerstown.
   This water later enters Antietam Creek upstream from station as sewage. Records adjusted for monthly and annual mean 
   inflow from January 1930 to September 2011. U.S. Geological Survey satellite data-collection platform at station.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 12,600 ft3/s, July 20, 1956, gage height,
   16.73 ft; minimum discharge, 9.4 ft3/s, Nov. 22, 1957, result of construction work upstream from 
   station.
COOPERATION.--Funding for the operation of this station is provided by the Maryland State Highway
   Administration, and the U.S. Geological Survey.