PROVISIONAL DATA SUBJECT TO REVISION

STATION.--01580000  DEER CREEK AT ROCKS, MD
LOCATION.--Lat 39°37'47.9", long 76°24'11.9", Harford County, Hydrologic Unit 02050306, on right
   bank 0.3 mi upstream from bridge on Cherry Hill Road, 0.8 mi southeast of Rocks, 1.2 mi upstream from Stirrup
   Road, and 23.5 mi upstream from mouth.
DRAINAGE AREA.--94.4 mi2.
PERIOD OF RECORD.--October 1926 to current year. Monthly discharge only for November and December 1926,
   published in WSP 1302.
REVISED RECORDS.--WSP 726: Drainage area. WSP 1502: 1927-36 (maximum and minimum only 1927-29,
   maximum only 1930-32, 1936).
GAGE.--Water-stage recorder. Concrete control since Sept. 7, 1938. Datum of gage is 250.40 ft above
   National Geodetic Vertical Datum of 1929 (Baltimore City bench mark).
REMARKS.--Prior to 1965, some regulation at low flow by mills upstream from station. U.S. Geological Survey
   gage-height telemeter at station. Water-quality records for some prior years have been collected at
   this station.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 13,600 ft³/s, Aug. 23, 1933,
   gage height 17.70 ft; minimum discharge, 3.5 ft³/s, Aug. 22, 2002.
EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum stage since at least 1888, that of Aug. 23, 1933.
COOPERATION.--Funding for the operation of this station is provided  by the Maryland State Highway
   Administration, and the U.S. Geological Survey.