WATER is expected to cascade from Wellington Dam's wall as early as next week if heavy rain across the South West continues.
The dam, near Collie, is currently sitting at 97 per cent capacity and is expected to break its 185 billion litre threshold.
That is the equivalent of more than 80,000 Olympic-sized swimming pools.
It will be the second year in a row if the dam overflows.
But Water Corporation South West regional manager John Janssen warned people visiting to witness the spectacle to take care.
“Seeing water cascade over the 367 metre long crest of the concrete wall at Wellington Dam is a spectacular sight, with huge numbers of community members usually descending on the area,” Mr Janssen said.
“Even though the dam overflowed last year, we’re still expecting the same reaction this year. It is important the community remain in the designated areas for their own safety, especially in the wet conditions.”
Water Corporation strengthened the wall in 2009, by installing a series of high-tensile steel cables vertically through the wall and into the bedrock below.
Harvey Dam overflowed for the first time in October last year.
Currently Harvey Dam is at about 81 per cent capacity and if current inflows continue it is expected to overflow again this year.
Dams used to supply drinking water in the South West are around 86 per cent of capacity, which is 3 per cent more than the same time last year.
Information on dam levels around the region can be found at watercorporation.com.au