The Somerset Dam is a mass concrete

gravity dam A gravity dam is a dam constructed from concrete or stone masonry and designed to hold back water by using only the weight of the material and its resistance against the foundation. Gravity dams are designed so that each section of the dam is ...

with a gated spillway across the Stanley River in

Queensland Queensland ( , commonly abbreviated as Qld) is a States and territories of Australia, state in northeastern Australia, and is the second-largest and third-most populous state in Australia. It is bordered by the Northern Territory, South Austr ...

, Australia. It is within the locality of Somerset Dam in the

Somerset Region The Somerset Region is a local government area located in the West Moreton region of South East Queensland, Australia, northwest of the City of Brisbane. The region is centred on the town of Esk, which also serves as the council seat. Somer ...

South East Queensland South East Queensland (SEQ) is a Bioregion, bio-geographical, Megalopolis, metropolitan and Statistics, statistical Regions of Queensland, region of the States and territories of Australia, state of Queensland in Australia, with a population of ...

. The main purpose of the dam is the

supply Supply or supplies may refer to: *The amount of a resource that is available **Supply (economics), the amount of a product which is available to customers **Materiel, the goods and equipment for a military unit to fulfill its mission *Supply, as ...

potable water Drinking water or potable water is water that is safe for ingestion, either when drunk directly in liquid form or consumed indirectly through food preparation. It is often (but not always) supplied through taps, in which case it is also calle ...

for the

Brisbane Brisbane ( ; ) is the List of Australian capital cities, capital and largest city of the States and territories of Australia, state of Queensland and the list of cities in Australia by population, third-most populous city in Australia, with a ...

, Gold Coast and

Logan City The City of Logan is a local government area (LGA) located in the south of Greater Brisbane in South East Queensland (SEQ), Australia. Situated between the City of Brisbane to the north and the City of Gold Coast to the south, the City of Lo ...

regions. Additionally, the dam provides for

flood mitigation Flood management or flood control are methods used to reduce or prevent the detrimental effects of flood waters. Flooding can be caused by a mix of both natural processes, such as extreme weather upstream, and human changes to waterbodies and ru ...

, recreation and for the generation of

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 ...

. 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 Somerset. As early as the 1960s it had become clear that the dam could not meet the water requirements of the region by the 1980s. The dam, lake and surrounding village of Somerset are named in honour of Henry Plantagenet Somerset, a local grazier and Member of the

Legislative Assembly of Queensland The Legislative Assembly of Queensland is the sole chamber of the unicameral Parliament of Queensland established under the Constitution of Queensland. Elections are held every four years and are done by full preferential voting. The Assembly ...

who represented the seat of

Stanley Stanley may refer to: Arts and entertainment Film and television * ''Stanley'' (1972 film), an American horror film * ''Stanley'' (1984 film), an Australian comedy * ''Stanley'' (1999 film), an animated short * ''Stanley'' (1956 TV series) ...

from 1904 until 1920.

Location and features

The dam is located approximately northwest of in the

and north of . The concrete dam structure is high and long. The dam wall holds back the reservoir when at full capacity. However, only is used for water supply and the remainder used for flood mitigation. From a

catchment area A catchment area in human geography, is the area from which a location, such as a city, service or institution, attracts a population that uses its services and economic opportunities. Catchment areas may be defined based on from where people are ...

of that includes much of the western slopes of the

D'Aguilar National Park D'Aguilar National Park is a national park in Queensland, Australia. It contains the D'Aguilar Range and is located along the northwest of the Brisbane metropolitan area. The park is traversed by the winding scenic Mount Nebo Road and Mount Glo ...

, the dam creates Lake Somerset at an elevation of

above sea level Height above mean sea level is a measure of a location's vertical distance (height, elevation or altitude) in reference to a vertical datum based on a historic mean sea level. In geodesy, it is formalized as orthometric height. The zero level ...

, with a surface area of . The gated spillway has a discharge capacity of . Built under the supervision of the Bureau of Industry, management of the dam was transferred to SEQ Water in July 2008 as part of a

water security The aim of water security is to maximize the benefits of water for humans and ecosystems. The second aim is to limit the risks of destructive impacts of water to an acceptable level. These risks include too much water (flood), too little water (d ...

project in the South East Queensland region, known as the South East Queensland Water Grid. A small hydroelectric power station is located adjacent to the dam wall. A water level of 90% is the optimum capacity for keeping

evaporation Evaporation is a type of vaporization that occurs on the Interface (chemistry), surface of a liquid as it changes into the gas phase. A high concentration of the evaporating substance in the surrounding gas significantly slows down evapora ...

rates to a minimum. Dam operators discharge water into the Wivenhoe Dam downstream to hold Somerset at this level when inflows are occurring. The dam is home to the Somerset Dam Power Station.

Construction

The site was first suggested for the location of a dam by Henry Somerset, the owner of Caboonbah Homestead, after the 1893 Brisbane floods caused severe damage to

Brisbane River The Brisbane River (Turrbal language, Turrbal: ) is the longest river in South East Queensland, Australia. It flows through the city of Brisbane, before emptying into Moreton Bay on the Coral Sea. John Oxley, the first European to explore the ...

valley residents downstream. A commission of enquiry recommended Stanley Gorge as the site for a dam in 1928, but it was not until 1933 when Brisbane was in a severe

drought A drought is a period of drier-than-normal conditions.Douville, H., K. Raghavan, J. Renwick, R.P. Allan, P.A. Arias, M. Barlow, R. Cerezo-Mota, A. Cherchi, T.Y. Gan, J. Gergis, D. Jiang, A. Khan, W. Pokam Mba, D. Rosenfeld, J. Tierney, ...

, that the Forgan Smith

Labor Labour or labor may refer to: * Childbirth, the delivery of a baby * Labour (human activity), or work ** Manual labour, physical work ** Wage labour, a socioeconomic relationship between a worker and an employer ** Organized labour and the labour ...

Government A government is the system or group of people governing an organized community, generally a State (polity), state. In the case of its broad associative definition, government normally consists of legislature, executive (government), execu ...

adopted the reservoir's construction as a major job creation project to counter job losses caused by the

Great Depression The Great Depression was a severe global economic downturn from 1929 to 1939. The period was characterized by high rates of unemployment and poverty, drastic reductions in industrial production and international trade, and widespread bank and ...

. Construction began in 1935. Worker's cottages had to be built and other facilities were constructed to attract construction workers and their families to the area. By 1942 the dam was almost complete when workers were diverted to the

war War is an armed conflict between the armed forces of states, or between governmental forces and armed groups that are organized under a certain command structure and have the capacity to sustain military operations, or between such organi ...

effort, with many being redeployed to construct the Cairncross Dockyard in Brisbane. Work on the dam recommenced in 1948. Opened in 1953 when structural work was finished, it was not until 1958 that the dam was officially named after Henry Somerset and the next year before all work related to the dam, including the

hydroelectric 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 ...

power station A power station, also referred to as a power plant and sometimes generating station or generating plant, is an industrial facility for the electricity generation, generation of electric power. Power stations are generally connected to an electr ...

was complete.

Recreation

There are two public access areas on Somerset Dam, Kirkleigh and The Spit. Both locations have multi-lane, concrete boat ramps with facilities for day-trippers. Camping is permitted and caravans are catered for at Kirkleigh and below the dam wall at Somerset Park in the small town of Somerset Dam. During busy periods the two camping locations can be filled to capacity with room for a maximum of 2,200 campers at Kirkleigh and 800 at Somerset Park. Lake Somerset Holiday Park's Kirkleigh campground also features cabin accommodation at the waterfront and direct access to the dam from a grassy spit. The dam contains of navigable waterway.

Fishing

The lake is a popular fishing destination, one of the top five fishing spots in the state. Fish species found in the dam include Australian bass, golden perch, silver perch, bony bream, eel-tailed catfish, spangled perch, Mary River cod, snub nosed gar, Queensland lungfish and saratoga. A stocked impoundment permit is required to

fish A fish (: fish or fishes) is an aquatic animal, aquatic, Anamniotes, anamniotic, gill-bearing vertebrate animal with swimming fish fin, fins and craniate, a hard skull, but lacking limb (anatomy), limbs with digit (anatomy), digits. Fish can ...

in the dam. SomersetFromAbove

Engineering heritage award

The dam is listed as an Engineering Heritage National 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

External links

Current dam level

* * ttps://web.archive.org/web/20100923174128/http://somersettourism.com.au/attractions1.php Somerset Tourism Natural Attractions
Photograph Albums of Construction of Somerset Dam 1937

State Library of Queensland State Library of Queensland (State Library) is the state public reference and research library of Queensland, Australia, operated by the Government of Queensland, state government. The Library is governed by the Library Board of Queensland, whi ...

{{DEFAULTSORT:Somerset Buildings and structures in Somerset Region Somerset, Lake Gravity dams Somerset Dam Dams completed in 1959 1959 establishments in Australia Energy infrastructure completed in 1959 Recipients of Engineers Australia engineering heritage markers