The Canning Dam is a gravity dam across the Canning River, located near Ashendon, in the City of Armadale, Western Australia. Completed in 1940, the dam created the Canning Reservoir that serves as a major source of potable water for the city of Perth, Western Australia. The dam's catchment area is dean from the Darling Scarp.
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It is noted for its innovative structural and hydraulic design that was considered to be at the forefront of concrete gravity dam design at the time of construction in from 1933 to its completion. The Canning Dam was Perth's primary water supply up until the 1961 when other sources of fresh water were tapped, such as the Serpentine dam. Currently the dam supplies approximately 20 percent of Perth's fresh water. Inflow into the Canning Reservoir is estimated to be 22 gigalitres (18,000 acre⋅ft) and, when full, the reservoir has a storage capacity of 90.352 gigalitres (73,250 acre⋅ft). Since its completion in 1940, the Canning Dam has contributed to a wide range of environmental and ecological problems in surrounding regions, problems include more common algal blooms, habitat loss and sedimentation. Despite these issues, Canning Dam and the adjacent parks and forests provide a variety of recreational activities for the public such as bushwalking, historic walks and picnic facilities.
