The Conowingo Dam is a large hydroelectric dam in the lower Susquehanna River near the town of Conowingo, Maryland. The medium-height, masonry gravity dam is one of the largest non-federal hydroelectric dams in the U.S., and the largest dam in the state of Maryland.
The dam sits about 9.9 miles from the river mouth at the Chesapeake Bay, 5 miles south of the Pennsylvania border and 45 miles northeast of Baltimore, on the border between Cecil and Harford counties.
The dam supports a 9,000-acre reservoir, which today covers the original town of Conowingo. During dam construction, the town was moved to its present location about 1 mile northeast of the dam's eastern end.
Wikipedia https://en.wikipedia.org/wiki/Conowingo_Dam
Address Conowingo Rd, 21918, United States
Coordinates 39°39'37.483" N -76°10'24.841" E