USGS Water-Year Summary 2021
03078000 CASSELMAN RIVER AT GRANTSVILLE, MD
LOCATION - Lat 39°42'07.9", long 79°08'11.0" referenced to North American Datum of 1983, Garrett County, MD, Hydrologic Unit 05020006, on left bank at downstream side of highway bridge, 0.3 mi upstream from Slaubaugh Run, 0.7 mi downstream from U.S. Highway 40, and 1.0 mi northeast of Grantsville.
DRAINAGE AREA - 64.2 mi².
PERIOD OF RECORD - July 1947 to current year.
GAGE - Water-stage recorder, crest-stage gage, and concrete control. Datum of gage is 2,088.56 ft above North American Vertical Datum of 1988.
PERIOD OF RECORD - October 1993 to September 1994, October 2010 to current year.
INSTRUMENTATION - Weighing cell precipitation gage.
EXTREMES FOR PERIOD OF RECORD - Maximum daily precipitation, 4.58 in., September 01, 2021.