The Essex County Hospital Center is a defunct psychiatric hospital that is located in the Township of Cedar Grove, New Jersey. It was used as a general hospital then converted to house mentally ill patients. Located at the edge of the Hilltop Reservation and designated a Conservation Easement in 2001 by the New Jersey Department of Environmental Protection, the site now is part of the Essex County park system.
In 1896, a large portion of land was purchased by the City of Newark, New Jersey; the land was bought to build a new hospital to relieve pressure in the overcrowded Newark Hospital. During the late 1800s and early 1900s, many buildings were built that housed patients and other facilities, such as a power house, laundromat, and theater. According to Weird New Jersey, in the winter of 1917, the hospital suffered a catastrophe with the failure of the hospital's boilers and 24 patients freezing to death in their beds. In the mid-1920s, the tri-state mental correction board bought the land and converted Overbrook into a mental institution. The Overbrook asylum ran on, adding several add-ons and new wards until its abrupt close in the winter of 2007.
In late 2006, the new Essex County Hospital Center 40°51′07″N 74°14′03″W / 40.8519085°N 74.2342726°W opened just down the road from the site of the original Overbrook Hospital. This center houses chronically ill psychiatric patients in need of longer lengths of stay than are available in community hospitals and medical centers. The new center takes a cutting edge approach to behavioral health care and its layout and programs stand in stark contrast to the hundred-year-old facility it replaced. It is located at 204 Grove Avenue in Cedar Grove.
Coordinates: 40°51′07″N 74°14′38″W / 40.8518893°N 74.2437581°W