Susquehanna River Basin

The Susquehanna River is the nation's sixteenth largest river and is the largest river lying entirely in the United States that flows into the Atlantic Ocean. The Susquehanna and its hundreds of tributaries drain 27,510 square miles, an area nearly the size of South Carolina, spread over parts of the states of New York, Pennsylvania, and Maryland.

The river meanders 444 miles from its origin at Otsego Lake near Cooperstown, New York, until it empties into the Chesapeake Bay at Havre de Grace, Maryland. The Susquehanna contributes one-half of the freshwater flow to the Bay.

Population (2020 Census)

• Total - 4,202,460
• In NY - 616,640
• In PA - 3,525,670
• In MD - 60,150

Major population centers: Binghamton, Elmira, Scranton, Wilkes-Barre, Williamsport, Altoona, Harrisburg, Lancaster, York

Please visit the Subbasins page for detailed information and maps on each subbasin.