Burdekin River, November 2005, taken from the Burdekin Bridge (Bruce Highway)
|Origin||Seaview Range near Ingham, Queensland
|Mouth||Pacific Ocean at Upstart Bay, near Ayr, Queensland
|Length||710 kilometres (441 mi)|
|Source elevation||1,200 metres (3,937 ft)|
|Avg. discharge||380m3/s (mean)
240/3/s (median annual)
- can range from nothing to over 40,000m3/s
|Basin area||129,700 square kilometres (50,077 sq mi)|
The Burdekin River in Queensland, Australia rises on the western slope of the Seaview Range and flows into the Pacific Ocean at Upstart Bay over 200 kilometres (124 mi) to the southeast of the source. The river was first encountered by Europeans during the expedition led by Ludwig Leichhardt in 1845 and named for Mrs. Thomas Burdekin, who had provided assistance to the expedition. The river rises on the northern slopes of Boulder Mountain at Valley of Lagoons.
The river was first discovered by John Clements Wickham aboard the HMS Beagle in 1839 who named it the Wickham River. In 1849, Ludwig Leichhardt named the river after Thomas Burdekin, one of the sponsors of Leichhardt's expedition. Because he was inland away from the coast he was not aware it was the same watercourse named by Wickham. The town of Wickham was established on Rita Island at the river mouth but was soon swept away during a flood in the 1860s.
Pastoralists had established runs along the river during the 1860s, with some along the lower reached taken for selection in the 1880s. The townships of Ayr and Brandon were established in 1882 with many sugarmills being erected. A railway line between Ayr and Townsville with a bridge built over the Burdekin to Home Hill in 1913 followed by bridge for road traffic in 1930. Both were too low and often damaged during flooding and the decision was made to replace them with a higher dual level bridge known as the Silver Link. Construction commenced in 1947 and was not completed until 1957 when the bridge opened.
A weir was constructed in a gorge in the Leichhardt Range for settlement farms near Calre and Dalbeg in 1953 for growing tobacco. In 1984 construction of the Burdekin Falls Dam commenced and was completed by 1987 when the dam started to fill forming Lake Dalrymple.
Floods events occur on average from no floods to three per year between December and March.
Heavy flooding occurred in 1875 with the Dawson, Fitzroy, Mary and Burdekin Rivers rising up to 60 feet (18 m) in a few hours. The waters washed away dwellings, fencing and livestock and effects downstream included the loss of the steamer SS Gothenburg which was unable to steer effectively and ran aground on a reef at the entrance of Flinders Channel.
In 1917 more severe flooding occurred with the bridge at Inkerman under 11 feet (3 m) of water and the one at Ayr over 14 feet (4 m) underwater after a day of flooding. Approximately one third of the Inkerman Bridge was later washed away by the floodwaters.
Further flooding occurred in 1927 with waters running nearly 6 feet (2 m) over the Inkerman Bridge and 3 feet (1 m) over the Burdekin Bridge, the river reached its peak at 66 feet (20 m) above summer levels at Sellheim.
During the 1974 flood event associated with Cyclone Wanda, which lasted from 17 December 1973 to 23 April 1974, an estimated mass discharge peak of 25,000 tonnes of water per second was reached, which affected 450 km of coastline and created a plume with widths ranging from 25 to 100 km.
Apart from the Murray River, it is economically the most important river in Australia, and has the fourth-largest watershed of any exorheic drainage system in Australia. It is also the fourth-largest river in Australia by volume of flow, but is so erratic that its discharge can reach the mean discharge of the Yangtze (after two severe cyclones in 1958) or have as many as seven months with no flow whatsoever (as in 1923). This exceedingly erratic flow is due to the extreme variability of precipitation throughout the entire basin. Annual rainfall at most gauges within the basin can range from 200 mm (8 inches) to over 1,600 mm (64 inches) depending on the monsoon and the number of cyclones that cross the coast. On the coast itself, the variability is even higher: at Bowen not far from the river's mouth, the annual rainfall has ranged from 216 millimetres (9 in) in 1915 to over 2,200 millimetres (87 in) in 1950. It has the highest mean annual flow for any river adjacent to the Great Barrier Reef.
Major tributaries feeding the Burdekin River include the Dry, Clarke, Suttor, Basalt, Running, Star, Fanning, Bowen, Bogie, Belyando and Cape rivers as well as Gray Creek, Douglas Creek, Oaky Creek, Keelbottom Creek, Allingham Creek, Southern Cross Creek and Stones Creek. The source of the Belyando river in central western Queensland is almost 500 kilometres (311 mi) from the mouth of the Burdekin River, and extends into the typical black-soil grassland of Central Queensland. The Burdekin itself almost reaches the Wet Tropics in its upper reaches. It does pass through the Einasleigh Uplands and Desert Uplands bioregions.
Four DIWA wetlands can be found along the course of the river. The first is at the Valley of Lagoons in the upper region of the catchment, the next is a Lake Dalrymple, then at the junction of the Burdekin and Bowen rivers known as the Burdekin-Bowen Junction and Blue Valley Weir Aggregation and the last is at the river delta which forms a 342.5 square kilometres (132 sq mi) wetland.
On the lower Burdekin floodplain an irrigation area was established in the early 1950s. At first only Gorge Weir and Blue Valley Weir provided water to the scheme, until the 1970s when Eungella Dam also provided water. Water is also drawn from the Haughton River. Major pump stations are located at Clare Weir feeding water to both sides of the river. An area of 2,560 km² is irrigated.
In the delta around Ayr and Home Hill, groundwater is used extensively to irrigate crops of sugar cane. This groundwater is recharged artificially during the extreme flood events that occasionally occur, usually due to a La Niña event. The use of groundwater in the floodplain is carefully managed so that supply can be maintained during the dry season and to prevent saltwater intrusion.
The North Coast railway line cross the river at Home Hill via a bridge constructed in 1913. At the same location the Bruce Highway traverses the river via the Burdekin Bridge. Further west it is crossed by the Flinders Highway.
Although on paper most of the basin of the Burdekin appears perfect for rainfed crops like cotton and maize, in fact the rainfall is so erratic that in almost every year a would-be farmer will experience either too little or too much rain for the crop to mature properly. Thus, most of the basin of the Burdekin can be used only for low-density grazing of sheep and cattle which is less likely to be damaged economically and ecologically by the extreme risks of an extraordinarily erratic climate.
The Valley of Lagoons Station was established in 1862 after the area in the upper reaches of the Burdekin was opened up by the government. Initially stocked with sheep the property was later used to raise cattle. Inkerman Station was established toward the lower reaches where the town of Inkerman now stands in 1864. The area was plagued by cattle tick, so the government acquired the property in 1910 and sold-off as farmland where sugarcane was later grown.
The natural vegetation away from the coast is a grassland dominated by perennial Mitchell and annual Flinders grasses, whilst near the coast there are patches of dry eucalypt forest on the typically infertile laterised soils characteristic of most of Australia.
Few mines exist along the waterway, with the notable exception of the Ben Lomond Uranium mine which is situated approximately 50 kilometres (31 mi) west of Townsville. The mine is currently dormant, but in 1981 the mine discharged toxic waste containing unacceptable levels of radioactivity, when its tailing dam overflowed into a creek that feeds into the Burdekin.
Neosilurus mollespiculum is a species of eeltail catfish endemic to the Burdekin. Many other species such as Agassiz's glassfish, Banded grunter, Barramundi, Black catfish, Eastern rainbowfish, Empire gudgeon, Freshwater longtom, Mangrove Jack, Tilapia and Yellowbelly are found throughout the catchment.
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Media related to Burdekin River at Wikimedia Commons
- Burdekin River in flood 1875 This photo is held by John Oxley Library, State Library of Queensland. Image number: raw00143