WATER NSW have continued testing of Lake Hume, but were unable to provide further information on the status of the waterway on Monday.
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It advised people to stay away and not coming into contact with the water, as well as cautioning livestock and pet owners from allowing their animals to come in contact with the water.
Environmental factors, such as low water levels and prevailing hot temperatures, have created ideal conditions for algal growth.
Hot temperatures are forecast to continue throughout this week.
The agency will provide an update on conditions in the coming days.
Water NSW were not able to provide any details of specific areas of Lake Hume which had been affected by outbreaks of blue-green algae.
The red-alert remains in place until further notice.
It comes as many will be expected to head to local waterways this weekend for Australia Day.
In preparation for the deluge of people expected to make use of the Murray River and Lake Hume over the weekend, the Royal Life Saving Society has urged swimmers not to drink if they plan on going swimming.
The organisation's CEO, Justin Scarr, said the most alcohol-related drowning deaths were recorded in the month of January and called for caution this weekend.
“We are deeply concerned about the high level of intoxication of men when in and around waterways,” he said.
“A culture of risk-taking behaviour by men around water can be dangerous, and when combined with alcohol, can be fatal.
“Look out for your mates, leave the booze until away from the water, and pull them into line if they’re under the influence and thinking about swimming or boating.”
Royal Life Saving released the results of research conducted at Noreuil Park in June last year, which showed 16 per cent of swimmers registered a positive blood alcohol reading, averaging .07.
Data collected on the Australia Day weekend in 2018 showed the average blood alcohol reading of people who had been drinking on the day was .110, more than twice the legal limit.
Researchers breathalysed more than 270 people in Albury.