It was constructed between 1858 and 1862. Covering an area of between 86th and 96th streets, the reservoir reaches a depth of more than in places and contains about of water. The Onassis Reservoir was created as a new, landscaped storage reservoir to the north of the Croton Aqueduct's rectangular receiving reservoir. Because of the Onassis Reservoir's shape, East Drive was built as a straight path, with little clearance between the reservoir to the west and Fifth Avenue to the east. It was decommissioned in 1993 and renamed after Jacqueline Kennedy Onassis the following year, after her death. The Turtle Pond, a man-made pond, is at the southern edge of the Great Lawn. The pond was originally part of the Croton receiving reservoir. The receiving reservoir was drained starting in 1930, and the dry reservoir bed was temporarily used as a homeless encampment when filling stopped during the Great Depression. The Great Lawn was completed in 1937 on the site of the reservoir. Until 1987, it was known as Belvedere Lake, after the castle at its southwestern corner. The Lake, south of the 79th Street transverse, covers nearly . Originally, it was part of the Sawkill Creek, which flowed near the American Museum of Natural History. The Lake was among the first features to be completed, opening to skaters in December 1858. It was intended to accommodate boats in the summer and ice skaters in winter. The Loeb Boathouse, on the eastern shore of the Lake, rents out rowboats, kayaks, and gondolas, and houses a restaurant. The Lake is spanned by Bow Bridge at its center, and its northern inlet, Bank Rock Bay, is spanned by the Bank Rock or Oak Bridge. Ladies' Pond, spanned by two bridges on the western end of the Lake, was infilled in the 1930s. Directly east of the Lake is Conservatory Water, on the site of an unbuilt formal garden. The shore of Conservatory Water contains the Kerbs Memorial Boathouse, where patrons can rent and navigate model boats. In the park's southeast corner is the Pond, with an area of . The Pond was adapted from part of the former DeVoor's Mill Stream, which used to flow into the East River at the modern-day neighborhood of Turtle Bay. The western section of the Pond was converted into Wollman Rink in 1950. Wildlife Central Park is biologically diverse. A 2013 survey of park species by