USGS Water-Year Summary 2021
01644148 POTOMAC RIVER AT EDWARDS FERRY NEAR POOLSVILLE, MD
LOCATION - Lat 39°05'55.1", long 77°28'16.5" referenced to North American Datum of 1983, Montgomery County, MD, Hydrologic Unit 02070008, on left bank in the wooded flood plain adjacent to the C&O Canal path, approximately 1000 ft downstream of Goose Creek.
DRAINAGE AREA - 11,130 mi².
PERIOD OF RECORD - August 2011 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 178.70 ft above North American
Vertical Datum of 1988.
EXTREMES FOR PERIOD OF RECORD - Maximum elevation, 22.45 ft, June 4, 2018, minimum elevation, 2.78 ft, September 29, 2019.