Lake Eildon
| Eildon Dam | |
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A view of the impounded Lake Eildon, in 2011
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 Location of the Eildon Dam in Victoria
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| Country | Australia |
| Location | Victorian Alps, Victoria |
| Coordinates | 37°11′34″S 145°53′49″E / 37.19278°S 145.89694°ECoordinates: 37°11′34″S 145°53′49″E / 37.19278°S 145.89694°E |
| Purpose | |
| Status | Operational |
| Construction began | 1915 |
| Opening date |
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| Operator(s) | Goulburn–Murray Water |
| Dam and spillways | |
| Type of dam | Embankment dam |
| Impounds | Goulburn River |
| Height | 84.5 m (277 ft) |
| Length | 1,085 m (3,560 ft) |
| Dam volume | 10,200×103 m3 (360×106 cu ft) |
| Spillway type | Controlled |
| Spillway capacity | 3,356 m3/s (118,500 cu ft/s) |
| Reservoir | |
| Creates | Lake Eildon |
| Total capacity | 3,390,000 ML (750,000×106 imp gal; 900,000×106 US gal) |
| Catchment area | 3,885 km2 (1,500 sq mi) |
| Surface area | 13,832 ha (34,180 acres) |
| Maximum water depth | 79 m (259 ft) |
| Normal elevation | 288.9 m (948 ft) AHD |
| Power station | |
| Name | Eildon Hydroelectric Power Station |
| Coordinates | 37°13′19″S 145°55′17″E / 37.22194°S 145.92139°E |
| Operator(s) | AGL Energy |
| Commission date |
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| Turbines | Four |
| Installed capacity | 135 MW (181,000 hp) |
| Annual generation | 226 GWh (810 TJ) |
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Website Lake Eildon at Goulburn–Murray Water |
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The Eildon Dam or Eildon Weir, a rock and earth-fill embankment dam with a controlled spillway across the Goulburn River, is located between the regional towns of Mansfield and Eildon within Lake Eildon National Park, in the Alpine region of Victoria, Australia. The dam's purpose is for the supply of potable water, irrigation, and the generation of hydroelectricity. The impounded reservoir is called Lake Eildon.
Designed by the State Rivers and Water Supply Commission of Victoria, construction of the original water storage, which was known as Sugarloaf Reservoir, took place between 1915 and 1929 to provide irrigation water for what was a vast uncultivated area on Victoria's northern plains. The dam was modified in 1929, and again in 1935 to increase the storage capacity to 377,000 megalitres (83×109 imp gal; 100×109 US gal). However, this reservoir was still limited in its capacity to meet the growing demand for water in the Goulburn Valley and to protect farmers during drought years. Following a detailed feasibility study of all possible storage sites on the Goulburn River, it was decided that the existing dam site was the most suitable for construction of a larger dam. In 1951, work began to enlarge the storage to its present capacity. The enlargement was completed in 1955 and the storage was renamed Lake Eildon.
The embankment dam wall is constructed with an earth core and rock fill, rising to a height of 83 metres (272 ft). The core component materials of the wall include 10,200 thousand cubic metres (360×106 cu ft) of rock and earth. With a catchment area of 3,885 square kilometres (1,500 sq mi) that includes the Goulburn, Delatite, Howqua, Big, and Jamieson rivers and several minor tributaries, the reservoir covers an area of 13,832 hectares (34,180 acres). The reservoir has a capacity of 3,390,000 megalitres (746×109 imp gal; 896×109 US gal) with an average depth of 24 metres (79 ft), and can release a maximum outflow of approximately 3,356 cubic metres per second (118,500 cu ft/s) via its controlled spillway. The crest of the uncontrolled spillway is 288.9 metres (948 ft) AHD and is approximately 1,085 metres (3,560 ft) long.
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