Learn about the environmental work being done by the Riverkeeper Alliance right in our own backyards! The Delaware Riverkeeper Network is a nonprofit, membership organization that has worked since 1988 to strengthen citizen protection of the Delaware River and its tributary watersheds. An affiliate of the American Littoral Society, a national conservation group, Riverkeeper works throughout the Delaware's entire 13,000 square mile watershed which includes portions of NY, NJ, PA and DE.