Lake Argyle is

Western Australia Western Australia (commonly abbreviated as WA) is a state of Australia occupying the western percent of the land area of Australia excluding external territories. It is bounded by the Indian Ocean to the north and west, the Southern Ocean to th ...

's largest and Australia's second largest

freshwater Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the term specifically excludes seawater and brackish water, it does include ...

man-made

reservoir A reservoir (; from French ''réservoir'' ) is an enlarged lake behind a dam. Such a dam may be either artificial, built to store fresh water or it may be a natural formation. Reservoirs can be created in a number of ways, including contro ...

by volume. The reservoir is part of the

Ord River Irrigation Scheme The Ord River is a river in the Kimberley region of Western Australia. The river's catchment covers . The lower Ord River and the conjunction with Cambridge Gulf create the most northern estuarine environment in Western Australia. The Ord ...

and is located near the East Kimberley town of Kununurra. The lake flooded large parts of the

Shire of Wyndham-East Kimberley Shire is a traditional term for an administrative division of land in Great Britain and some other English-speaking countries such as Australia and New Zealand. It is generally synonymous with county. It was first used in Wessex from the begin ...

on the Kimberley Plateau about inland from the

Joseph Bonaparte Gulf Joseph Bonaparte Gulf is a large body of water off the coast of the Northern Territory and Western Australia and part of the Timor Sea. It was named after Joseph Bonaparte, brother of Napoleon and King of Naples (1806-1808) and then Spain (1808 ...

, close to the border with the

Northern Territory The Northern Territory (commonly abbreviated as NT; formally the Northern Territory of Australia) is an states and territories of Australia, Australian territory in the central and central northern regions of Australia. The Northern Territory ...

. The primary inflow is the

Ord River The Ord River is a river in the Kimberley region of Western Australia. The river's catchment covers . The lower Ord River and the conjunction with Cambridge Gulf create the most northern estuarine environment in Western Australia. The Ord ...

, while the

Bow River The Bow River is a river in Alberta, Canada. It begins within the Canadian Rocky Mountains and winds through the Alberta foothills onto the prairies, where it meets the Oldman River, the two then forming the South Saskatchewan River. These w ...

and many other smaller creeks also flow into the dam. The lake is a DIWA-listed wetland. Lake Argyle and

Lake Kununurra Lake Kununurra is a freshwater man-made reservoir located in the Ord River valley. The lake was formed in 1963 by the construction of the Ord Diversion Dam in Kununurra, northern Western Australia, which was built to supply water to the Ord Ri ...

were listed in 1990 as

Ramsar Convention The Ramsar Convention on Wetlands of International Importance Especially as Waterfowl Habitat is an international treaty for the conservation and sustainable use of Ramsar sites (wetlands). It is also known as the Convention on Wetlands. It i ...

protected wetlands.

History and construction

The construction of the Ord River Dam was completed in 1971 by

Dravo Corporation Dravo Corporation was a shipbuilding company with shipyards in Pittsburgh and Wilmington, Delaware. It was founded by Frank and Ralph Dravo in Pittsburgh in 1891. The corporation went public in 1936 and in 1998 it was bought out by Carmeuse for $ ...

. The dam was officially opened the following year. The dam wall is long, and high. The earth-fill only dam wall at Lake Argyle is the most efficient dam in Australia in terms of the ratio of the size of the dam wall to the amount of water stored. The lake was named after the property it partly submerged, Argyle Downs. Ord River Dam post office opened on 1 March 1969 and closed on 15 November 1971 demonstrating the approximate duration of the construction camp. In 1996, the spillway wall was raised by , which doubled the dam's capacity.

Sediment Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles. For example, sand an ...

flowing into the dam caused concerns in the mid-1990s that the dam's capacity could be dramatically reduced. By 2006 continual regeneration of the upper Ord catchment appeared to have reduced the amount of sediment inflow. The dam received a Historic Engineering Marker from

Engineers Australia Engineers Australia (EA) is an Australian professional body and not-for-profit organisation whose purpose is to advance the science and practice of engineering for the benefit of the community. Engineers Australia is Australia's recognized org ...

as part of its Engineering Heritage Recognition Program.

Geography

Lake Argyle normally has a surface area of about . The storage capacity, to the top of the spillway is . The lake filled to capacity in 1973, and the spillway flowed until 1984. Lake Argyle's usual storage volume is , making it the largest reservoir in Australia. The combined

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 ...

Lake Pedder Lake Pedder, once a glacial outwash lake, is a man-made impoundment and diversion lake located in the southwest of Tasmania, Australia. In addition to its natural catchment from the Frankland Range, the lake is formed by the 1972 damming of the ...

system in

Tasmania ) , nickname = , image_map = Tasmania in Australia.svg , map_caption = Location of Tasmania in AustraliaCoordinates: , subdivision_type = Country , subdi ...

is larger but is two dams connected by a canal. At maximum flood level, Lake Argyle would hold of water and cover a surface area of . Higher areas have become permanent islands within the lake's area.

Irrigation

Lake Argyle, together with

, is part of the Ord River Irrigation Scheme. There are currently some of farmland under irrigation in the East Kimberly region. The original plan was for dam water to irrigate

rice Rice is the seed of the grass species ''Oryza sativa'' (Asian rice) or less commonly ''Oryza glaberrima ''Oryza glaberrima'', commonly known as African rice, is one of the two domesticated rice species. It was first domesticated and grown i ...

crop for export to China. However these plans were scuttled as waterfowl, particularly

magpie geese The magpie goose (''Anseranas semipalmata'') is the sole living representative species of the family Anseranatidae. This common waterbird is found in northern Australia and southern New Guinea. As the species is prone to wandering, especially wh ...

ate rice shoots more quickly than they could be planted. Other crops are now grown, but Lake Argyle still remains Australia's most under-utilised lake.

Flora and fauna

The damming of the Ord River has caused major changes to the environment. Flows to the Ord River have been severely reduced. Within Lake Argyle itself a thriving new eco-system has developed. The lake is recognised as an important wetland area under the

; with Lake Kununurra it forms the Lakes Argyle and Kununurra Ramsar Site. The lake is now home to 26 species of native fish and a population of

freshwater crocodile The freshwater crocodile (''Crocodylus johnstoni''), also known as the Australian freshwater crocodile, Johnstone's crocodile or the freshie, is a species of crocodile endemic to the northern regions of Australia. Unlike their much larger Austr ...

s currently estimated at some 25,000. Fish species that are present in Lake Argyle include

barramundi The barramundi (''Lates calcarifer'') or Asian sea bass, is a species of catadromous fish in the family Latidae of the order Perciformes. The species is widely distributed in the Indo-West Pacific, spanning the waters of the Middle East, South ...

southern saratoga The southern saratoga (''Scleropages leichardti''), also known as the spotted bonytongue, spotted saratoga, or simply saratoga, is a freshwater bony fish native to Australia. It belongs to the subfamily Osteoglossinae, or arowanas, a primitive gro ...

archer fish The archerfish (spinner fish or archer fish) form a monotypic family, Toxotidae, of fish known for their habit of preying on land-based insects and other small animals by shooting them down with water droplets from their specialized mouths. The ...

, forktail cat fish,

mouth almighty ''Glossamia aprion'' is a species of freshwater ray-finned fish from the family Apogonidae, the cardinalfishes, from northern Australia and New Guinea. In Australia, it is commonly known as the mouth almighty. Description ''G. aprion'' has a cr ...

, long tom,

bony bream Bony bream ''Nematalosa erebi'' are a widespread and common, small to medium-sized Australian freshwater fish often found in large shoals throughout much of northern and central Australia, and the Murray-Darling basin. Description A deep bodied ...

and

sleepy cod The sleepy cod (''Oxyeleotris lineolata'') is a medium-sized fish in the family Butidae, native to tropical fresh waters of northern Australia and questionably from New Guinea. It is a member of the order Perciformes, thus is unrelated to the ...

. While the official website states that only incidentally a

saltwater crocodile The saltwater crocodile (''Crocodylus porosus'') is a crocodilian native to saltwater habitats and brackish wetlands from India's east coast across Southeast Asia and the Sundaic region to northern Australia and Micronesia. It has been listed ...

is found, other experts disagree. Cane toads reached the dam in late 2008, mostly via traveling along the

Victoria Highway The Victoria Highway links the Great Northern Highway in Western Australia with the Stuart Highway in the Northern Territory. The highway is a part of the Perth - Darwin National Highway link. It is signed as National Highway 1, and is part ...

, with numbers rising significantly during the 2009 summer.

Birds

Southern end of Lake Argyle from the air

The lake, with its surrounding

mudflat Mudflats or mud flats, also known as tidal flats or, in Ireland, slob or slobs, are coastal wetlands that form in intertidal areas where sediments have been deposited by tides or rivers. A global analysis published in 2019 suggested that tidal fl ...

s and

grassland A grassland is an area where the vegetation is dominated by grasses (Poaceae). However, sedge (Cyperaceae) and rush (Juncaceae) can also be found along with variable proportions of legumes, like clover, and other herbs. Grasslands occur natur ...

s, has been identified by

BirdLife International BirdLife International is a global partnership of non-governmental organizations that strives to conserve birds and their habitats. BirdLife International's priorities include preventing extinction of bird species, identifying and safeguarding ...

as an

Important Bird Area An Important Bird and Biodiversity Area (IBA) is an area identified using an internationally agreed set of criteria as being globally important for the conservation of bird populations. IBA was developed and sites are identified by BirdLife Int ...

(IBA) because it supports about 150,000

waterbird A water bird, alternatively waterbird or aquatic bird, is a bird that lives on or around water. In some definitions, the term ''water bird'' is especially applied to birds in freshwater ecosystems, although others make no distinction from seabi ...

s with twelve species being represented in large enough numbers to be considered internationally significant. The mud flats and grasslands are the natural habitat of eight wader species also represented in internationally significant numbers, along with a healthy population of

Australian bustard The Australian bustard (''Ardeotis australis'') is a large ground dwelling bird which is common in grassland, woodland and open agricultural country across northern Australia and southern New Guinea. It stands at about high, and its wingspan is ...

s which are considered a "near threatened" species. Birds for which the lake has global importance include

wandering whistling-duck The wandering whistling duck (''Dendrocygna arcuata'') is a species of whistling duck. They inhabit tropical and subtropical Australia, the Philippines, Borneo, Indonesia, Papua New Guinea and the Pacific Islands. Taxonomy There are three subsp ...

s, green pygmy-geese,

Pacific black duck The Pacific black duck (''Anas superciliosa''), commonly known as the PBD, is a dabbling duck found in much of Indonesia, New Guinea, Australia, New Zealand, and many islands in the southwestern Pacific, reaching to the Caroline Islands in the no ...

hardhead The hardhead (''Aythya australis''), also known as the white-eyed duck, is the only true diving duck found in Australia. The common name "hardhead" has nothing to do with the density of the bird's skull, instead referring to the difficulty encou ...

black-necked stork The black-necked stork (''Ephippiorhynchus asiaticus'') is a tall long-necked wading bird in the stork family. It is a resident species across the Indian Subcontinent and Southeast Asia with a disjunct population in Australia. It lives in wetla ...

s, white-headed stilts,

red-capped plover The red-capped plover (''Charadrius ruficapillus''), also known as the red-capped dotterel, is a small species of plover. It breeds in Australia. This species is closely related to (and sometimes considered conspecific with) the Kentish plover, ...

Oriental plover The oriental plover (''Charadrius veredus''), also known as the oriental dotterel, is a medium-sized plover closely related to the Caspian plover. It breeds in parts of Mongolia and China, migrating southwards each year to spend its non-breedi ...

black-fronted dotterel The black-fronted dotterel (''Elseyornis melanops'') is a small plover wader in the Charadriidae family. Description This shorebird is easily recognizable with its distinct black face mask, forehead and v-shaped band across the chest. Dorsall ...

long-toed stint The long-toed stint (''Calidris subminuta'') is a small wader. The genus name is from Ancient Greek ''kalidris'' or ''skalidris'', a term used by Aristotle for some grey-coloured waterside birds. The specific ''subminuta'' is from Latin ''sub'', ...

s and

sharp-tailed sandpiper The sharp-tailed sandpiper (''Calidris acuminata'') (but see below) is a small wader. Taxonomy A review of data has indicated that this bird should perhaps better be placed into the genus ''Philomachus'' – as ''P. acuminatus'' – which now ...

s. Common larger-bodied bird species found at the lake include the

Australian pelican The Australian pelican (''Pelecanus conspicillatus'') is a large waterbird in the family Pelecanidae, widespread on the inland and coastal waters of Australia and New Guinea, also in Fiji, parts of Indonesia and as a vagrant in New Zealand ...

black swan The black swan (''Cygnus atratus'') is a large waterbird, a species of swan which breeds mainly in the southeast and southwest regions of Australia. Within Australia, the black swan is nomadic, with erratic migration patterns dependent upon c ...

eastern great egret The eastern great egret (''Ardea alba modesta''), a white heron in the genus '' Ardea'', is usually considered a subspecies of the great egret (''A. alba''). In New Zealand it is known as the white heron or by its Māori name ''kōtuku''. The sub ...

royal spoonbill The royal spoonbill (''Platalea regia'') also known as the black-billed spoonbill, occurs in intertidal flats and shallows of fresh and saltwater wetlands in Australia, New Zealand, Indonesia, Papua New Guinea, and the Solomon Islands. (In New Z ...

osprey The osprey (''Pandion haliaetus''), , also called sea hawk, river hawk, and fish hawk, is a diurnal, fish-eating bird of prey with a cosmopolitan range. It is a large raptor reaching more than in length and across the wings. It is brown o ...

and

wedge-tailed eagle The wedge-tailed eagle (''Aquila audax'') is the largest bird of prey in the continent of Australia. It is also found in southern New Guinea to the north and is distributed as far south as the state of Tasmania. Adults of this species have lon ...

. Common smaller-bodied bird species include the

spinifex pigeon The spinifex pigeon (''Geophaps plumifera''), also known as the plumed-pigeon or gannaway pigeon, is one of four endemic Australian bird species within the genus ''Geophaps''. It occurs within a broader group known as bronzewing pigeons. This sp ...

peaceful dove The peaceful dove (''Geopelia placida'') is a pigeon native to Australia and New Guinea. The peaceful dove is closely related to the zebra dove of south-east Asia and the barred dove of eastern Indonesia. Until recently, the three were classed as ...

common sandpiper The common sandpiper (''Actitis hypoleucos'') is a small Palearctic wader. This bird and its American sister species, the spotted sandpiper (''A. macularia''), make up the genus ''Actitis''. They are parapatric and replace each other geographic ...

white-winged tern The white-winged tern, or white-winged black tern (''Chlidonias leucopterus'' or ''Chlidonias leucoptera''), is a species of tern in the family Laridae. It is a small species generally found in or near bodies of fresh water across much of the wo ...

and

budgerigar The budgerigar ( ; ''Melopsittacus undulatus''), also known as the common parakeet or shell parakeet, is a small, long-tailed, seed-eating parrot usually nicknamed the budgie ( ), or in American English, the parakeet. Budgies are the only spe ...

, while mid-sized bird species include the

red-winged parrot The red-winged parrot (''Aprosmictus erythropterus'') is a parrot native to Australia and New Guinea. It is found in grasslands, savannah, farmland, and woodland. Taxonomy The red-winged parrot was formally described in 1788 by the German natur ...

blue-winged kookaburra The blue-winged kookaburra (''Dacelo leachii'') is a large species of kingfisher native to northern Australia and southern New Guinea. Measuring around , it is slightly smaller than the more familiar laughing kookaburra. It has cream-coloured u ...

and

barking owl The barking owl (''Ninox connivens''), also known as the winking owl, is a nocturnal bird species native to mainland Australia and parts of New Guinea and the Moluccas. They are a medium-sized brown owl and have a characteristic voice with cal ...

. Some threats identified by the IBA include invasive weed and animal species, such as the cane toad, as well as agricultural uses,

free range Free range denotes a method of farming husbandry where the animals, for at least part of the day, can roam freely outdoors, rather than being confined in an enclosure for 24 hours each day. On many farms, the outdoors ranging area is fenced, ...

cattle and

feral A feral () animal or plant is one that lives in the wild but is descended from domesticated individuals. As with an introduced species, the introduction of feral animals or plants to non-native regions may disrupt ecosystems and has, in some ...

ungulate Ungulates ( ) are members of the diverse clade Ungulata which primarily consists of large mammals with hooves. These include odd-toed ungulates such as horses, rhinoceroses, and tapirs; and even-toed ungulates such as cattle, pigs, giraffes, cam ...

s that may be over-grazing in the shallow areas around the lake. The IBA recommends that a fence be installed in the important shallows in the south and east to prevent all ungulates from entering those lake areas.

References

External links

* {{DEFAULTSORT:Argyle Ramsar sites in Australia DIWA-listed wetlands Important Bird Areas of Western Australia Reservoirs in Western Australia Dams completed in 1973 Ord River Dam Ord River Lakes of the Kimberley (Western Australia)