Mount Crosby Weir

Dam in South East Queensland

27°32′14″S 152°47′52″E / 27.53722°S 152.79778°E / -27.53722; 152.79778PurposePotable water supplyStatusOperationalOpening date1892 (1892)Operator(s)SEQ WaterDam and spillwaysType of damWeirImpoundsBrisbane RiverHeight4.57 m (15.0 ft)Length81.4 m (267 ft)ReservoirTotal capacity3,430 ML (750×10^⁶ imp gal; 910×10^⁶ US gal)^[1]Maximum width30.5 m (100 ft)Normal elevation141.34 m (463.7 ft) AHD Website
www.seqwater.com.au

The Mount Crosby Weir is a heritage-listed weir on the Brisbane River at Mount Crosby and Chuwar, both in City of Brisbane, Queensland, Australia. The project was instigated by John Petrie at the end of the 19th century. The town of Brisbane was expanding and seeking more reliable sources of drinking water than Enoggera Dam and Gold Creek Dam could provide. In conjunction with the Mount Crosby Pumping Station, it was listed on the Queensland Heritage Register on 25 October 2019.^[2]

Location and features

The location was selected because it was just above the upstream tidal flow of seawater at Colleges Crossing. The concrete structure was completed in April 1892.^[3] The dam wall rises 4.57 metres (15.0 ft) and is 81.4 metres (267 ft) in length.^[3] The weir has a capacity of 3,430 megalitres (750×10^⁶ imp gal; 910×10^⁶ US gal), making it one of the largest weirs in the region.^[1] Above the weir is a one-lane road which is open to the public.

The nearby Mount Crosby Pumping Station is used to transport drinking water that is sourced from both the weir and the nearby Lake Manchester Dam, which was built shortly after the Mount Crosby Weir.

Without an ongoing eradication program, water hyacinth weed can choke the waters behind the weir, all the way upstream to Fernvale. In 2009, the weir was flushed to remove algae and organic matter that had built up.^[4]

Heritage listing

References

^ ^a ^b "Weirs". Water supply: Dams and weirs. Seqwater. 2014. Archived from the original on 26 August 2014. Retrieved 5 July 2014.
^ "Mount Crosby Pumping Station Complex (entry 650236)". Queensland Heritage Register. Queensland Heritage Council. Retrieved 28 April 2021.
^ ^a ^b Horton, Helen (1988). Brisbane's Back Door: The story of the D'Aguilar Range. Bowen Hills, Queensland: Boolarong Publications. p. 79. ISBN 0-86439-036-X.
^ Chung, Francis (15 January 2009). "Tests show Mount Crosby Treatment Plant water improving". The Courier-Mail. Queensland Newspapers. Archived from the original on 5 September 2012. Retrieved 16 November 2009.

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Water supply in Queensland, Australia

Dams and reservoirs by region

South East Queensland	Atkinson Baroon Pocket Biggera Creek Bill Gunn Bromelton Cedar Grove Weir Lake Clarendon Enoggera Ewen Maddock Gold Creek Hinze Lake Manchester Leslie Harrison Little Nerang Maroon Moogerah Mount Crosby Weir North Pine Poona Sideling Creek Six Mile Creek Somerset Splityard Creek Wappa Wivenhoe Wyaralong
Darling Downs	Connolly Cooby Coolmunda Cressbrook Glenlyon Leslie Perseverance
South West Queensland	E.J. Beardmore Neil Turner Weir
Wide Bay–Burnett	Ben Anderson Barrage Bjelke-Petersen Boobir Boondooma Borumba Cania Cedar Pocket Cooloolabin Fred Haigh Gordonbrook Lake Gregory Lenthalls McCauley Weir Meandu Creek Paradise Placer Wuruma
Central Queensland	Lake Awoonga Burton Gorge Callide Fairbairn Fitzroy River Barrage Kroombit Middle Creek Number 7 Teemburra Theresa Creek
North Queensland	Bamboo Burdekin Falls Eungella Gattonvale Offstream Storage Kinchant Paluma Peter Faust Ross River Solomon Teviot Creek
Far North Queensland	Copperlode Falls Ibis Irvinebank Koombooloomba Return Creek Southedge Stannary Hills Lake Tinaroo Wild River
North West Queensland	Lake Belmore Corella East Leichhardt Lake Julius Kidston Lake Moondarra Rifle Creek
Historical	Nindooinbah Tallebudgera Creek

Water resource management by function

Companies and government agencies	Gold Coast Water Queensland Urban Utilities seqwater SunWater WaterSecure
Other sources / facilities	Bradfield Scheme Bundaberg Irrigation Scheme Gold Coast Desalination Plant Mount Crosby Pumping Station SEQ Water Grid Toowoomba Water Futures referendum, 2006 Western Corridor Recycled Water Scheme
Regulators	Department of Energy and Water Supply
Historical	Brisbane Water LinkWater Queensland Water Commission SEQ Water Grid Manager