The Gordon Dam, also known as the Gordon River Dam, is a major gated double curvature concrete
arch dam
An arch dam is a concrete dam that is curved upstream in plan. The arch dam is designed so that the force of the water against it, known as hydrostatic pressure, presses against the arch, causing the arch to straighten slightly and strengtheni ...
with a controlled
spillway
A spillway is a structure used to provide the controlled release of water downstream from a dam or levee, typically into the riverbed of the dammed river itself. In the United Kingdom, they may be known as overflow channels. Spillways ensure tha ...
across the
Gordon River
The Gordon River is a major perennial river located in the central highlands, south-west, and western regions of Tasmania, Australia.
Course and features
The Gordon River rises below Mount Hobhouse in the Franklin-Gordon Wild Rivers Nation ...
, located in
Southwest National Park
Southwest National Park is an Australian national park located in the South West Tasmania, south-west of Tasmania, bounded by the Franklin-Gordon Wild Rivers National Park to the north and the Hartz Mountains National Park to the east. It is a ...
,
Tasmania
Tasmania (; palawa kani: ''Lutruwita'') is an island States and territories of Australia, state of Australia. It is located to the south of the Mainland Australia, Australian mainland, and is separated from it by the Bass Strait. The sta ...
, Australia. The impounded
reservoir
A reservoir (; ) is an enlarged lake behind a dam, usually built to water storage, store fresh water, often doubling for hydroelectric power generation.
Reservoirs are created by controlling a watercourse that drains an existing body of wa ...
is called
Lake Gordon
Lake Gordon is a man-made reservoir created by the Gordon Dam, located on the upper reaches of the Gordon River in the south-west region of Tasmania, Australia.
Features
The reservoir was formed in the early 1970s as a result of the dam const ...
.
The dam was constructed in 1974 by the
Hydro Electric Corporation for the purpose of generating
hydroelectricity
Hydroelectricity, or hydroelectric power, is Electricity generation, electricity generated from hydropower (water power). Hydropower supplies 15% of the world's electricity, almost 4,210 TWh in 2023, which is more than all other Renewable energ ...
via the
conventional Gordon Power Station located below the dam wall.
Features and location
The Gordon Dam wall, constructed with of concrete, is long and high, making it the tallest dam in Tasmania and the fifth-tallest in Australia. At 100% capacity the dam wall holds back of water; making Lake Gordon the largest lake in Australia. The surface area of the lake is and the catchment area is . The single controlled spillway is capable of discharging .[
Approximately 48 arch dams have been built in Australia and only nine have double curvature. Gordon Dam is almost twice the height of the next highest arch dam, Tumut Pondage.][
]
Power station
Water from the dam descends underground into its power station, where three turbines
A turbine ( or ) (from the Greek , ''tyrbē'', or Latin ''turbo'', meaning vortex) is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful work. The work produced can be used for generating electrical ...
generate up to of power, covering about 13% of the electricity demand of Tasmania
Tasmania (; palawa kani: ''Lutruwita'') is an island States and territories of Australia, state of Australia. It is located to the south of the Mainland Australia, Australian mainland, and is separated from it by the Bass Strait. The sta ...
. The first two turbines were commissioned in 1978, before the third was commissioned a decade later in 1988.
The power station is fueled by water from Lake Gordon. Water from Lake Pedder
Lake Pedder, once a glacial outwash lake, is a man-made impoundment and diversion lake located in South West Tasmania, Australia. In addition to its natural catchment from the Frankland Range, the lake is formed by the 1972 damming of the ...
is also drawn into Lake Gordon through the McPartlans Pass Canal at .
History
In 1963, the federal government
A federation (also called a federal state) is an entity characterized by a political union, union of partially federated state, self-governing provinces, states, or other regions under a #Federal governments, federal government (federalism) ...
provided a $5 million grant to Tasmania's Hydro-Electric Commission
Hydro Tasmania, formerly the Hydro-Electric Commission (HEC), is a Tasmanian Government Government-owned corporation, business enterprise which is the main electricity generator in Tasmania, Australia. Originally oriented towards hydro-electric ...
to build the Gordon River Road
The Gordon River Road, sometimes called the Strathgordon Road, (B61), is a road in the south western region of Tasmania, Australia.
The road was built by the Hydro-Electric Commission of Tasmania with funding from the Australian Government t ...
from Maydena
Maydena is a locality in Tasmania, Australia, alongside the River Tyenna.
Maydena is on the Gordon River Road, south west of New Norfolk, through the Bushy Park Hop Fields, turn left at Westerway, past Mount Field National Park and Russell Fal ...
into the Gordon River area in the South West Wilderness
The South West Wilderness of Tasmania, Australia is a remote and inaccessible region of South West Tasmania containing unspoilt scenery, rugged peaks, wild rivers, unique flora and fauna, and a long and rugged coastline. Parts of the wilderness ...
region. Construction was underway by 1964, and within three years, the Tasmanian State Parliament approved the Gordon River Power Development with little in-house opposition in 1967. Power operation began in 1978; a third generator was added in 1988.
The completed Gordon Dam was the only dam built on the Gordon River, despite the support of Tasmanian politicians such as Eric Reece
Eric Elliott Reece, AC (6 July 190923 October 1999) was Premier of Tasmania on two occasions: from 26 August 1958 to 26 May 1969, and from 3 May 1972 to 31 March 1975. His 13 years as premier remains the second longest in Tasmania's history, se ...
, Robin Gray, and others to build the Franklin Dam
The Gordon-below-Franklin Dam (or simply Franklin Dam) project was a proposed dam on the Gordon River in Tasmania, Australia, that was never constructed. The movement that eventually led to the project's cancellation became one of the most sign ...
further downstream. The construction of Gordon Dam resulted in some flooding of the connected Lake Pedder as planned. Subsequent opposition to restore Lake Pedder failed after a Parliamentary inquiry in 1995.
The dam was designed with Sergio Guidici as the chief engineer. He went on to be involved with the design of the Crotty Dam
The Crotty Dam, also known during construction as the King Dam, or the King River Dam on initial approval, is a rockfill embankment dam with a controlled and uncontrolled spillway across the King River, between Mount Jukes and Mount Huxley ...
in the West Coast Range
The West Coast Range is a mountain range located in the West Coast, Tasmania, West Coast region of Tasmania, Australia.
The range lies to the west and north of the main parts of the Franklin-Gordon Wild Rivers National Park.
The range has h ...
, one of the last significant dams created by Hydro Tasmania during its dam-building era.
The dam is connected with the Gordon River Power Station, under the surface of the switch yard.
In 2015, the Perth
Perth () is the list of Australian capital cities, capital city of Western Australia. It is the list of cities in Australia by population, fourth-most-populous city in Australia, with a population of over 2.3 million within Greater Perth . The ...
-based YouTube channel How Ridiculous broke the world record for the world's highest basketball shot at Gordon dam, though this record has since been surpassed by How Ridiculous themselves twice over.
2015–2016 Tasmanian energy crisis
Due to an extreme drought in 2015 and the untimely failure of the related Basslink
The Basslink () electricity interconnector is a high-voltage direct current (HVDC) cable linking the electricity grids of the states of Victoria and Tasmania in Australia, crossing Bass Strait, connecting the Loy Yang Power Station, Victori ...
connector, electricity production needs had drained the lake to its minimum operating level in March 2016. The water level fell 45 metres to a record low of six per cent capacity. Pictures document the dramatic effect. After repair of Basslink and record rainfalls, Lake Gordon levels had recovered to -28 metres by January 2017.
Engineering heritage award
The dam is listed as a National Engineering Landmark by Engineers Australia
Engineers Australia (EA), known formally as the Institution of Engineers, Australia, is an Australian professional body and Non-profit organization, not-for-profit organisation whose purpose is to advance the science and practice of engineerin ...
as part of its Engineering Heritage Recognition Program.
References
{{Western Tasmania , state=autocollapse
Arch dams
Dams completed in 1978
Gordon River power development scheme
Hydro Tasmania dams
Recipients of Engineers Australia engineering heritage markers
1978 establishments in Australia