Dartmouth Dam has climbed to a three-year high amid predictions of a wetter than average spring.
The largest capacity dam in the state is 73.05 per cent full compared with 54.77 per cent 12 months ago.
In 2018, Dartmouth reached 89 per cent of its total capacity of almost 4000 gigalitres and has not spilled since 1996.
This week it increased by 21 gigalitres to 2807 gigalitres after heavy rainfall measuring 22 millimetres upstream near Omeo this week.
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Murray Darling Basin Authority executive director of river management Andrew Reynolds said September wasn't expected to pose many problems.
But in October there was a greater risk posed from the potential of Lake Hume filling.
"Predicted rainfall for September is reduced with average rainfall forecast, but the October forecast is still wetter than median," he said.
"If we have above average rainfall spread over a few days it's not an issue.
"However it may become more of a challenge if we get a big rain event.
"(Lake Hume) is at a level that is likely to see it fill if there is more rain in coming weeks."
Pre-releases to maintain airspace in Lake Hume took place in mid-August and environmental water holders have called on water to meet demand at Yarrawonga.
"Around 100 gigalitres of water have been released this month," Mr Reynolds said.
"It is a combination of pre-releases for airspace and (environmental) water releases.
"If more rain falls than forecast we may undertake further pre-releases."
Bureau of Meteorology climatologist Dr Andrew Watkins said predictions for a wet and warmer spring followed a wet winter.
"Nationally, we've seen the wettest winter since 2016," he said.
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