Mangrove Creek Dam, a concrete faced rockfill embankment dam, is the primary reservoir for water supply to residents of the Central Coast in New South Wales, Australia. The dam, with a capacity of 190,000 megalitres (6,700×106 cu ft) and fed by a catchment area of 101 square kilometres (39 sq mi), is operated by the Central Coast Water Corporation and supplies approximately 93 per cent of water to 300,000 residents in Central Coast Council. The dam was constructed between 1978 and 1982, formed by impounding the headwaters of Mangrove Creek, a tributary of the Hawkesbury River.