Reservoir was finished by 1862. An 1875 map of Central Park clearly shows the Lower and Upper reservoirs. Decommissioning The reservoir was decommissioned in 1993, after it was deemed obsolete because of a new main under 79th Street that connected with the Third Water Tunnel, and because of growing concerns that it could become contaminated. Though deemed obsolete, it remained a part of the NYC water supply and it was intended to be used to supplement the city's upstate water supply in drought emergencies. Concern about the reservoir's future grew in early 1992: many people worried that the city would put turf over it as was done in the 1920s, when the adjacent Lower Reservoir was deemed obsolete, and the Great Lawn was developed over the Lower Reservoir's former site. Despite various plans to reuse the Upper Reservoir's site for some other purpose, residents and advocates wrote letters to the Central Park Conservancy and city government to preserve the reservoir as-is. Papers were signed to allow for the transfer of the reservoir in 1999 from the Department of Environmental Protection to the Department of Parks and Recreation. The year 1999 was chosen because it was the projected completion date for a filtration plant at Van Cortlandt Park, near the Jerome Reservoir in the Bronx, which is part of the city's Croton water-supply system. The Croton Water Filtration Plant was activated in 2015. Renaming In 1994 the Reservoir was renamed in honor of Jacqueline Kennedy Onassis to commemorate her contributions to the city (which included saving Grand Central Terminal from demolition and restoring it as an architectural landmark, protesting against the building of structures that would hinder Central Park's beauty, and serving as a board member of the Municipal Art Society) and because she enjoyed jogging in the area. The windows of her 1040 Fifth Avenue apartment, located on the Upper East Side, overlooked this area. Description The Reservoir covers and holds over of water. Though no longer used to distribute New York City's water supply, it provides water for the Pool and the Harlem Meer. It is a popular place of interest in Central Park. There is a jogging track around it used by many runners, the Stephanie and Fred Shuman Running Track, and it is also encircled by the park's bridle trail. Bill Clinton, Barack Obama, Madonna, and Jacqueline Kennedy Onassis have all run the track. Separating the track