The Delaware River has a long history of flooding. The river's floodplain, as well as those of its tributaries, has been subject to both local and widespread damage.

Yes, the Delaware River has a long history of significant flooding events. The most catastrophic was the Great Flood of August 1955, which remains the flood of record. It was caused by the back-to-back remnants of Hurricanes Connie and Diane, which dropped massive amounts of rain over a short period, killing nearly 100 people in the Delaware River Basin and destroying numerous bridges. Other major floods occurred in October 1903, which set many early records, and more recently in January 1996, when heavy rain combined with rapid snowmelt caused the river to crest more than two feet above flood stage in Trenton, NJ. Significant flooding also occurred in April 2005 and June 2006, leading to widespread evacuations and property damage. In response to these recurring events, the Delaware River Basin Commission (DRBC) and local authorities have implemented extensive flood warning systems and mitigation strategies throughout the region.