After good weekend rainfall in the catchment Lake Julius is over the spillway for the second time this summer.
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Operators Sunwater released this image overnight saying Julius Dam was at 100.18% capacity and has started spilling excess water.
"If downstream of the dam, expect increased river flows and remember if it's flooded, forget it," Sunwater said.
The good news follows big rainfall totals in Mount Isa and surrounding districts on Saturday.
Mount Isa is 100km upstream of Lake Julius on the Leichhardt River and can store 107,500 ML at capacity.
The lake also went over 100 per cent full in December.
Lake Moondarra closer to Mount Isa went from 67.45% full on Thursday to 72.63% on Monday, a rise of over five per cent.
Lake Moondarra has a 107,000 ML capacity.
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