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Over the next year, the USGS Pennsylvania Water Science Center will be updating the geodetic vertical elevation (gage datum) for many locations. Click HERE for additional information including a current list of streamgages with upcoming datum changes. This update in gage datum does not affect the location of the streamgage, nor the observed local gage height or discharge recorded at the streamgage.
For information about dam operations, call 1-888-457-4076 or contact Constellation Energy (http://www.constellationenergy.com/)
LOCATION.-- Lat 39°39'28.4", long 76°10'28.0", Harford County, MD, Hydrologic Unit 02050306, 1.0 mi southwest of Conowingo, and 9.9 mi upstream from mouth. DRAINAGE AREA.--27,100 mi2 PERIOD OF RECORD.--October 1967 to current year. GAGE.--Water-stage recorder. Datum of gage is 4.16 ft above North American Vertical Datum of 1988. REMARKS.--Flow regulated by Conowingo Reservoir beginning October 1928, usable capacity, 55,070,000,000 gal; dead storage, 45,290,000,000 gal. Records do not include a small infrequent diversion upstream from station to augment municipal supply of city of Baltimore. Records of diversion available from Baltimore City Department of Public Works. U.S. Geological Survey satellite data-collection platform at station. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 1,130,000 ft3/s, June 24, 1972, gage height, 36.83 ft; minimum discharge, 144 ft3/s, Mar. 2, 1969. COOPERATION.--Funding for the operation of this station is provided by Constellation Energy Generation. Access to gage site provided by Constellation Energy Generation.
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