They would sail down the river to where it emptied into the Chesapeake Bay.
VOA: special.2009.09.17
The Potomac River flows from Georgetown into the Chesapeake Bay, and Pittsburgh is on the Ohio River.
VOA: standard.2010.04.29
Minor tidal flooding was possible along the Delaware coast, the western shore of the Chesapeake Bay and the lower Potomac River, the National Weather Service said.