The 338 acre reservation is owned by the state Department of Conservation and Recreation. An educational poster at the park entrance describes the reservation as a habitat for common and rare resident and migratory bird species. The land includes salt marshes, brackish ponds, mud flats, rocky headlands, wetlands, hardwood forests and sandy beaches. In 1996, five acres of the land was set aside for a state of the art tertiary leaching area for the treatment plant to address the island's waste water issues. The land was acquired in 1988, from Realty Transfer of New Jersey for $1.6 million.