Oswego River (New York) - The River Course

The River Course

The Oswego River starts at the confluence of the Oneida River (flowing from Oneida Lake) and the Seneca River (flowing from Seneca Lake, Cayuga Lake, and Montezuma Marsh). The river drains an area of 5,122 square miles (13,265 km²), as large as the states of Rhode Island and Delaware.

At its mouth at Lake Ontario, the river divides the City of Oswego just as it divides the City of Fulton a few miles upstream.