Mount Bold Reservoir

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Reservoir information
Mount Bold Reservoir
Locale	South Australia
Length	192 m
Height	50.8 m
Construction began	1932
Opening date	1938
Construction Cost	$1.1 million
Capacity	46 180 ML
Surface area	3.08km²
Geographical Data
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Mount Bold Reservoir is the largest reservoir in South Australia with a maximum capacity of over forty-six thousand megalitres. Costing AU$1.1 million, the Reservoir took six years to construct on the Onkaparinga River system between 1932 and 1938. The Reservoir does not connect directly to the main reticulation system; rather, to maintain levels at Clarendon Weir, water is released only as required. Much of the water from Mount Bold will eventually end up at Happy Valley Reservoir and used to supply parts of the Mount Lofty Ranges and also Adelaide.

A major renovation was completed in 1964 when the level of the dam was raised 6.4 metres to increase the Reservoir's capacity by approximately 17,000 megalitres. Although originally supplying its own electricity through a small hydro-electricity plant, this was discontinued in 1961. However, Mount Bold is now considered a possible site for a future commercial mini-hydro generator.

In early June 2007, the South Australian Government began a scoping study into expanding the Reservoir's capacity fivefold to 240 gigalitres at an estimated cost of AU$850 million.^[1] The plan was criticised by the Opposition as not providing any new water, and by ecologist David Patton as threatening surrounding wildlife.^[2]

Type of wall: Concrete gravity arch

[edit] 2007 Fire

A bushfire ravaged through the Mt Bold Valley area which includes the properties between Kangarilla and Echunga during the second week of Janurary 2007. The fire destroyed two houses, guttered over ten sheds and killed livestock and horses. Two people were injured and fencing was damaged. The fire started on dusk of the 10th of January and burnt ferociously into the night with conditions worsening. On the next day the fire headed towards Echunga but was contained by CFS crews.^[3]