Mount Crosby Weir

The Mount Crosby Weir is a weir on the Brisbane River at Mount Crosby in South East 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.

Mount Crosby Weir
View from the southern side of the weir, looking upstream, towards the reservoir.
Location of the Mount Crosby Weir
in Queensland
CountryAustralia
LocationSouth East Queensland
Coordinates27°32′14″S 152°47′52″E
PurposePotable water supply
StatusOperational
Opening date1892 (1892)
Operator(s)SEQ Water
Dam and spillways
Type of damWeir
ImpoundsBrisbane River
Height4.57 m (15.0 ft)
Length81.4 m (267 ft)
Reservoir
Total 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

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.[2] The dam wall rises 4.57 metres (15.0 ft) and is 81.4 metres (267 ft) in length.[2] 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 the weir as well as Lake Manchester Dam 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 algai and organic matter that had built up.[3]

gollark: It's probably cheaper if you don't go to the ISS.
gollark: Laptops are 2kg or so.
gollark: It was probably only £100000 or so.
gollark: You'll not fill that with ONE LAPTOP.
gollark: Space is expensive.

See also

References
  1. "Weirs". Water supply: Dams and weirs. Seqwater. 2014. Archived from the original on 26 August 2014. Retrieved 5 July 2014.
  2. 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.
  3. 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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