USGS Water-Year Summary 2017
01581810 GUNPOWDER FALLS AT HOFFMANVILLE, MD
LOCATION - Lat 39°41'23.3", long 76°46'53.3" referenced to North American Datum of 1983, Baltimore County, MD, Hydrologic Unit 02060003, on left bank 500 ft upstream from bridge on Gunpowder Road, 0.4 mi upstream from Walker Run, 0.5 mi north of Hoffmanville, and 0.7 mi upstream from Prettyboy Reservoir.
DRAINAGE AREA - 27 mi².
PERIOD OF RECORD - April 2000 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 543.60 ft above North American Vertical Datum of 1988.