Undammed
The main stem of the Delaware is the longest free-flowing (undammed) river east of the Mississippi. Tributary river flows are controlled by upstream reservoirs operated by the City of New York. Under a 1954 Decree signed by the United States Supreme Court, in times of normal precipitation and runoff, the average daily flow at the northernmost river gauge in Montague, New Jersey must be maintained at 1,750 cubic feet per second.
The Upper Delaware Scenic and Recreational River, added by the U.S. Congress in 1978 as the 19th component of the National Wild and Scenic Rivers System, is exactly 73.4 miles long, extending from the confluence of the East and West Branches of the Delaware River above Hancock, NY downstream to Railroad Bridge No. 2 in Mill Rift, PA. The corridor is comprised of 55,575.5 acres of land.
