Official figures show more than 82,000 roads have been impacted by flood related closures in just the past two months.
The figures, from the Australian Climate Service and obtained by AAP, follow widespread flooding across parts of NSW, Queensland, Victoria and South Australia.
Since October 14 there have been 82,634 roads impacted by flood-related closures with 6,841 roads blocked at different times during that period.
The closures peaked on October 16 when 331 roads were closed impacting supply chains.
As of Friday, 44 roads remain closed nationally including roads feeding into Victorian ports, and parts of major supply routes like the Newell Highway near Forbes in NSW.
NSW Farmers Grenfell chair, Harvey Matthews, told AAP that the closure of a stretch of the Newell is causing a major headache for road users in his area.
"The pressure that it's creating for our shire is that it's putting all this extra traffic onto shire roads that aren't federally funded, and roads that were never built to take B Doubles or B Triples."
"When we take our grain trucks out onto the road, we're competing with the Newell highway traffic, for a space on the road to get our product to the grain site," Mr Matthews told AAP.
Grenfell producer Wayne Dunford from NSW Farmers said the Newell Highway has already been closed for several weeks.
"It's time and money, and it's not only to the local farmer right now, it's also to the whole grain industry."
"That's the supply chain for livestock or grain going to feed lots south, all of it starts to multiply," Mr Dunford told AAP.
Emergency services and agriculture minister Murray Watt has said that his government is working closely with the states and local governments to get the roads moving again.
"We'll keep rolling up that support as much as we need, but I'm very conscious that the roads and infrastructure is a really big issue," he told AAP last week.
The final cost of fixing the country's roads won't be known until all roads are repaired and reopened.
