The reservoir's eastern end
|Surface area||1.78 km²|
Millbrook Reservoir is a 16,000-megalitre artificial water storage reservoir in the Adelaide Hills, South Australia. It was built from 1914 to 1918 during World War I to control water flows in the upper River Torrens and provide gravity-fed water to Adelaide's eastern suburbs. It is named after the small town of Millbrook, demolished and removed during construction. During the 1970s, the nearby town of Chain Of Ponds, South Australia was also removed to prevent pollution of the reservoir's water.
Millbrook covers 178 hectares (440 acres) behind a 288-metre (945 ft) clay-cored earth dam. It lies on Chain of Ponds creek, a tributary of the River Torrens. Water in the reservoir is piped from a weir near Gumeracha but it is also used to balance storage of River Murray water via the Mannum–Adelaide pipeline. It is used to capture approximately half of the Torrens' water flow.
- "Water Storage (Reservoirs), Millbrook". SA Water. 2004. Retrieved 2008-07-08.
- SA Water (12 December 2005). "Millbrook Reservoir Dam Safety". Parliament of South Australia. Archived from the original on 2008-07-27. Retrieved 2008-07-09.
- Klaassen, Nic. "John Tippett". Flinders Ranges Research. Retrieved 2008-07-09.
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