Hindmarsh Valley Reservoir is a reservoir in the Australian state of South Australia located in the gazetted locality of Hindmarsh Valley about 11 kilometres (7 mi) north of the municipal seat in Victor Harbor. The dam consists of a gravity dam of a height of 13.6 metres (44.5 ft) which holds back a lake of a volume of 360 megalitres (80,000,000 imp gal) and which extends for a distance about 0.80 kilometres (0.5 mi). Its original purpose was to supply only Victor Harbor, Middleton and Port Elliott, however water mains were extended to Goolwa after its residents petitioned the state government.