This Waterborne Transportation Study assesses the viability of water transportation as an access mode serving Gateway and other assets of the National Parks of New York Harbor, and develops a preliminary ferry service concept plan to serve the needs of park visitors. The study consisted of the following principal tasks: (1) identification of opportunities to implement ferry services; (2) analysis of advantages and disadvantages of different service options; (3) identification of required improvements and investments associated with different service concepts; (4) feasibility assessment of alternatives; and (5) development of a ferry service concept plan.