Aqueduct Commission. New Croton Aqueduct. Locality plan showing where a new gate house will be built to connect the New Croton Aqueduct to the reservoir in Central Park (now the Jacqueline Kennedy Onassis Reservoir). The rectangular reservoir on the left is now the site of the Great Lawn. This plan also showcases the sites of the Metropolitan Museum of Art and the American Museum of Natural History. January 3, 1888.