BORUMBA Dam is now completely closed to all water-based recreation, following an extension to the partial ban already in force.
The more extensive closure announced this morning follows an apparently worsening outbreak of toxic blue-green algae, in response to heat, sunshine and high levels of nutrients in water flowing into the dam.
Seqwater Chief Executive Officer Peter Dennis said the organisation was fast-tracking the analysis of further lake water samples in an effort to re-open the dam ahead of the Australia Day weekend.
The closure took effect yesterday, he said.
"The decision to close is not one we take lightly. Seqwater has a duty of care to ensure visitors to our lakes are not exposed to blue-green algal blooms and the potential health conditions which can result from exposure,'' Mr Dennis said.
"We are very conscious of the impact water-based recreation closures have on the community, including local business and will be re-opening the lake as soon as it I safe to do so.''
Blue-green algae blooms generally occur in the warmer months due to increased water temperature, abundant nutrients and optimal light conditions.
In normal conditions the algae exist in low numbers in waterways with no detriment to public health. But under certain conditions, particularly during warmer weather, the algae can grow rapidly, resulting in algal blooms which can produce toxins harmful to human health
Borumba Dam is one of four lakes across the region currently closed to algal blooms or other water quality issues.
Visitors are asked to observe signage in place at Lake Borumba and follow the direction of staff.
The Seqwater website (www.seqwater.com.au) and Facebook and Twitter pages will be updated as conditions change at Lake Borumba.
For more information, a fact sheet on blue-green algae is available on our website