The Delaware River is one of the last large free-flowing rivers left in the contiguous 48 states - one of the last major rivers without any dams or control structures on its main stem. More than 100 miles of the 330-mile long Delaware River have been placed into, and an additional 80-mile section is currently a candidate for, the National Wild and Scenic Rivers System. The tidal Delaware River and Delaware Bay are part of the National Estuary Program established by the Federal Clean water Act.