Clarendon Weir
The Clarendon Weir is a weir in the Australian state of South Australia, located on the Onkaparinga River in the suburb of Clarendon, about south of the Adelaide city centre. Built in 1894–96 as part of the Onkaparinga Water Scheme, the weir was designed to pool water from the Mount Bold Reservoir, on the Onkaparinga, which is often boosted with water from the Murray River. Water is directed through pipeline from the weir to Happy Valley Reservoir in the Field River catchment. The water is used to supply the majority of the Adelaide region's water needs. In  the mid-1960s, the wall of the Clarendon Weir, originally constructed with large blocks of Macclesfield marble, was raised from to its current height of . The weir was listed on the former Register of the National Estate, and has been listed as a state heritage place on the South Australian Heritage Register since 8 November 1984.