The extraordinary extent of damage to the state's roads is slowly being revealed as floodwater starts to recede across regional Victoria.  

The damage bill to fix and re-open Victoria's road network won't be known until floodwater completely subsides, with a significant number of roads and bridges still under water.  

Reports of potholes "the size of cars" emerged within hours of the most significant rain falling on Thursday. 

Victorian Premier Daniel Andrews on Monday said the government would spend $165 million on an "emergency road repair blitz" to find and fix the potholes that could be accessed safely. 

"There'll need to be more funding beyond that, this is an initial funding amount of money and it will underpin those emergency repairs," Mr Andrews said. 

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"Just over the past few days, hundreds of crews have already completed more than 500 individual inspections of larger damaged sites.

The state government's package includes funding for roads and bridges, however the Mr Andrews said more help would be required. 

Nervous wait for farmers

Victorian farmers are anxiously waiting to survey the damage when floodwaters recede.

Victorian Farmers Federation president Emma Germano told ABC Radio Melbourne there was potential for significant losses.

"In some cases we've now got animals that are stranded, we're going to have to be working out how to get feed and fodder to them," Ms Germano said.

Moyne Shire Council Mayor Ian Smith said he was worried about the effect road closures would have on farmers in his south-west Victorian community.

"It's going to have a massive impact — not only on the dairy industry but to farmers across the shire, that's going to be our major priority."

The Commonwealth Government has made funding available to a number of shires, however Moyne Shire was not included. 

The Moyne Shire mayor said he was concerned not only for the region's dairy farmers that rely on the road network to transport product immediately, but grain farmers further north who will start harvesting within months. 

Cr Smith said councils would need to receive financial contributions from federal and state governments to help fix the crumbled infrastructure.

"It's not just Moyne Shire, it's all over the state," he said.

"It's going to quite difficult getting the ear of the (minister) as some of these regions may have been more heavily impacted than us."

Federal Emergency Management Minister Murray Watt said the Australian and Victorian governments were working together to support communities.

"Support to councils is available for the costs of the repair and restoration of essential public assets," he said.

Victorian Emergency Services Minister Jaclyn Symes said it was important that impacted communities received support.

"As the water recedes, the impact of the damage will be clearer and we'll be able to provide the support that's needed," Ms Symes said.