A controversial project to build a hydroelectric dam and reservoir on the Delaware River in the 1950s and 1960s led to government's seizure of land in northwestern New Jersey and northeastern Pennsylvania under the authority of the U.S. Army Corps of Engineers. The construction of the dam would have created a lake reservoir that would have flooded the Walpack Valley. For political and geological reasons, the dam project was deauthorized and the land transferred to the management of the National Park Service for the establishment of a National Recreation Area.[3] Currently, Wallpack Ridge is located in the Delaware Water Gap National Recreation Area that was established by the National Park Service in 1978.
^Witte, Ron W., and Monteverde Don H. "Karst in the Delaware Water Gap National Recreation Area" from Unearthing New Jersey (Newsletter) Vol. 2 No. 1 Winter 2006. (Trenton: New Jersey Geological Survey, Department of Environmental Protection, 2006).
^Feiveson, Harold; Sinden, Frank; and Socolow, Robert. Boundaries of Analysis: an Inquiry Into the Tocks Island Dam Controversy. (1976); Albert, Richard C. Damming the Delaware: The Rise and Fall of Tocks Island Dam (State College, Pennsylvania: Pennsylvania State University Press, 1987).
