Mount Crosby Weir

Mount Crosby Weir
View from the southern side, looking upstream, towards the reservoir
Coordinates	27°32′14″S 152°47′52″E / 27.5373°S 152.7979°E / -27.5373; 152.7979Coordinates: 27°32′14″S 152°47′52″E / 27.5373°S 152.7979°E / -27.5373; 152.7979
Lake type	reservoir
Primary inflows	Brisbane River
Primary outflows	Brisbane River
Basin countries	Australia
Built	1892
Max. length	81.4 m
Max. width	30.5 m
Surface elevation	141.34 m

The Mount Crosby Weir is 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.

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.^[1] The dam wall rises 4.57 m and is 81.4 m in length.^[1] The weir has a capacity of 3430 ML, making it one of the largest weirs in the region.^[2] On top of 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]

See also

Queensland portal

• List of reservoirs and dams in Australia
• South East Queensland Water Grid

References

1. ^ ^{a b} Horton, Helen (1988). Brisbane's Back Door: The story of the D'Aguilar Range. Bowen Hills, Queensland: Boolarong Publications. pp. 79. ISBN 086439036 X. 
2. ^ "Weirs". Seqwater. http://www.seqwater.com.au/public/catch-store-treat/dams/weirs. Retrieved 2009-11-16. 
3. ^ Francis Chung (15 January 2009). "Tests show Mount Crosby Treatment Plant water improving". The Courier-Mail. Queensland Newspapers. http://www.news.com.au/couriermail/story/0,23739,24915860-3102,00.html. Retrieved 2009-11-16. ^{[dead link]}