USGS Water-Year Summary 2021
01639000 MONOCACY RIVER AT BRIDGEPORT, MD
LOCATION - Lat 39°40'44.6", long 77°14'04.3" referenced to North American Datum of 1983, Frederick County, MD, Hydrologic Unit 02070009, on right bank at downstream side of bridge on State Highway 140 at Bridgeport, 0.9 mi upstream from Cattail Branch, 3.4 mi northwest of Taneytown, 4.8 mi downstream from confluence of Rock and Marsh Creeks at Pennsylvania-Maryland State line, and 52 mi upstream from mouth.
DRAINAGE AREA - 173 mi².
- WSP 1382: 1944(M).
PERIOD OF RECORD - May 1942 to current year.
GAGE - Water-stage recorder and crest stage gage. Concrete control since Sept. 15, 1947. Datum of gage is 340.18 ft above North American Vertical Datum of 1988. Prior to May 3, 1946, nonrecording gage and crest-stage gages at site 0.3 mi downstream at gage datum 0.98 ft lower. July 3, 2012 to April 27, 2016, at site 60 ft downstream, at present datum.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Aug. 24, 1933, reached a stage of about 25 ft, present site and gage datum, from floodmarks, discharge, 23,000 ft³/s. Stage exceeded that of June 1889, from information by local residents.