USGS Water-Year Summary 2021
01642190 MONOCACY RIVER AT MONOCACY BOULEVARD AT FREDERICK, MD
LOCATION - Lat 39°26'36.9", long 77°22'56.2" referenced to North American Datum of 1983, Frederick County, MD, Hydrologic Unit 02070009, on downstream side of Monocacy Blvd. bridge, 0.4 mi south of MD Route 26 (Liberty Road), 1.7 mi downstream from Israel Creek, 4.5 mi upstream from Linganore Creek, and 21.8 mi upstream from mouth.
DRAINAGE AREA - 703 mi².
PERIOD OF RECORD - October 2003 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 240.00 ft above North American Vertical Datum of 1988 (levels by City of Frederick Engineers).