Lake Richmond
Coordinates: 32°17′10″S 115°42′54″E / 32.286°S 115.715°E Lake Richmond is a freshwater lake in Rockingham, Western Australia. It is approximately 1,000 m × 600 m (3,300 ft × 2,000 ft), with an area of 40 ha (99 acres), and is 15 m (49 ft) deep in the centre. It is believed to be named after the London borough.
The lake is less than 1 km (0.62 mi) from the coast, having separated from the ocean at Cockburn Sound within the last 4,000 years.
The shallow waters within about 15 metres (49 ft) of the edges of the lake are home to thrombolites, estimated to be about six million years old. The internal structure of the thrombolites is believed to be unique in the world.
Before 1960, the lake's salinity was 2000–3500 mg/L,. In the 1960s it was used as part of an urban drainage scheme; the Water Board constructed inlet and outlet drains. Subsequently the salinity level dropped to 300–400 mg/L.
A boardwalk extends approximately 115 m (377 ft) into the lake.
Water birds that inhabit the area include the Australian pelican, black swan, Australian shelduck, musk duck, white-faced heron and common greenshank. The lake is home to the Swan River goby (Psuedogobius olorum), eastern mosquitofish, sea mullet, goldfish and yabbies.
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