Glenmaggie Dam
| Glenmaggie Dam | |
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Downstream face.
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 Location of the Glenmaggie Dam in Victoria
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| Country | Australia |
| Location | Sale, Central Gippsland, Victoria |
| Coordinates | 37°54′17″S 146°48′00″E / 37.90472°S 146.80000°ECoordinates: 37°54′17″S 146°48′00″E / 37.90472°S 146.80000°E |
| Purpose | Irrigation |
| Status | Operational |
| Construction began | 1919 |
| Opening date | 1927 |
| Owner(s) | Southern Rural Water |
| Dam and spillways | |
| Type of dam | Gravity dam |
| Impounds | Macalister River |
| Height | 37 m (121 ft) |
| Length | 295 m (968 ft) |
| Elevation at crest | 77 m (253 ft) AHD |
| Width (crest) | 99 m (325 ft) |
| Dam volume | 77×103 m3 (2.7×106 cu ft) |
| Spillways | 2 |
| Spillway type | Uncontrolled |
| Spillway capacity | 3,400 m3/s (120,000 cu ft/s) |
| Reservoir | |
| Creates | Lake Glenmaggie |
| Total capacity | 190,410,000 m3 (6.724×109 cu ft) |
| Active capacity | 177,628,000 m3 (6.2729×109 cu ft) |
| Inactive capacity | 4,860,000 m3 (172,000,000 cu ft) |
| Catchment area | 1,891 km2 (730 sq mi) |
| Surface area | 1,760 ha (4,300 acres) |
| Power station | |
| Name | Glenmaggie Power Station |
| Commission date | 1994 |
| Turbines | 2 x Francis-type |
| Installed capacity | 4 MW (5,400 hp) |
| Annual generation | 9 GWh (32 TJ) |
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Website Glenmaggie Dam at Southern Rural Water |
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The Glenmaggie Dam is a concrete rock foundation gravity dam with two uncontrolled spillways across the Macalister River, located near Sale, Central Gippsland, in the Australian state of Victoria. The dam's purpose includes irrigation, the generation of hydro-electric power, water supply and conservation. The impounded reservoir is called Lake Glenmaggie.
Construction of the Glenmaggie Dam commenced in 1919, was completed in 1927 and constructed by the State Rivers and Water Supply Commission of Victoria. When full following its construction, the dam held 132,000 megalitres (4,700×106 cu ft) and provided irrigation to approximately 360 square kilometres (140 sq mi) of farming land in the Central Gippsland region; via a gravity irrigation systems to properties in the Macalister Irrigation District, near the towns of Maffra, Heyfield, Stratford and Sale. The Macalister Irrigation District covers about 53,000 hectares (130,000 acres) around the Macalister and Thomson rivers, extending from Lake Glenmaggie to Sale. It comprises two areas: the Maffra-Sale Irrigation Area to the north of the Thomson River and the Central Gippsland Area (including the Nambrok-Denison Soldier Settlement district) to the south.
The Glenmaggie Dam wall, which creates the Glenmaggie Lake, is a mass concrete overfall dam with irrigation outlets on both sides of the river serving irrigation channels. The central portion is an overfall spillway. The dam wall was raised in 1958 by the addition of gates; stabilised using ground anchors in 1989; and upgraded in 2003 to enable it to withstand overtopping.
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