Lake users, including pumpers, boat operators and recreational users, should consider adjusting their activities for changing water levels until the lake returns to normal operating level in late July.
MDBA head of River Management David Dreverman said the major irrigation offtake orders will continue to be met from Lake Mulwala until the end of the irrigation season on Friday 15 May.
"The level of Lake Mulwala will fall by an average of 15 centimetres a day, until it reaches 3.5 metres below the normal operating level by around 1 June," Mr Dreverman said.
"It will remain at this level until mid-July for works to be completed at the weir and foreshore and to allow the aquatic weed to dry out.
"Depending on the volume of water flowing in from the Ovens and Kiewa rivers, we expect the lake to be back at its normal height in late July, ready for the new irrigation season."
Mr Dreverman said the needs of the local community around Lake Mulwala were an important consideration in timing the draw-down.
"We've sought to limit any disruption these activities might cause by discussing the work with local tourism operators, the council and industry, and we appreciate the community's cooperation.
"It's essential that we maintain river infrastructure for local use and to support the industries and environment that rely on the efficient management of the river."
The structural works will include routine testing of the weir's anchors and erosion control on the lake foreshore. Lowering the lake by 3.5 metres will also dry out the aquatic weed Egeria densa, which will help to stop it spreading in the lake.
Lake users are advised to consult NSW Department of Primary Industries and Roads and Maritime Services information for fishing and boating advice during the drawdown. More information on the drawdown will be provided in the MDBA's River Operations Weekly Report on the MDBA website
ENDS
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