Description: Extending some 326 miles for the headwaters to the mouth, the Delaware River watershed drains a 12,765 square mile area of the United States comprising portions of the states of New York, Pennsylvania, New Jersey, Delaware, and Maryland. Maryland, however, dows not border on the Delaware River itself and contributes only eight square miles to the watershed.
The East and West branches of the Delaware River arise on the western slopes of the Catskill Mountains of New york and flow seaward to meet a few miles downstream of Hancock, N.Y. forming the Delaware River. From this junctions, the river forms the boundary between the states of New York and Pennsylvania as it flows through forested mountains to Port Jervis, N.Y. Larger tributaries joining the Delaware River in this section include the Mongaup River and Neversink River of New York, and the Lackawaxen River of Pennsylvania. From the Port Jervis area, the Delaware River forms the boundary between Pennsylvania and New Jersey as it flows to Trenton, N.J., where Trenton falls limits the landward penetration of tidal waters.
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