An irrigation bridge along the road which has sunk over the years will be improved and fixed following a $2.7 million from the NSW government.

It will see a new concrete, three-span bridge and road alignment.

The government said the work will benefit the region through avoiding a 10-kilometre detour for around 12,000 vehicles per year and encouraging the potential growth of freight by up to 17,000 vehicles per year.

Southern Cotton is one of many agricultural businesses along the road, with staff and clients travelling the stretch in question each day.

General manager Kate O'Callaghan said the upgrade work was a long time coming. 

"The bridge has been an issue for about two years now," she said. 

"This upgrade is certainly very welcome.

"At the moment it's quite dangerous. Because the bridge has sunk you can only go 40kmh over it. So in quite a short amount of time you're going from 100kmh, to 60kmh to 40kmh. 

"That road is very busy everyday, so this is good news … hopefully it can be done this coming winter."

The funding comes from the government's Fixing Country Roads program and will also see a widening of the Jerilderie Road.

"The Fixing Country Roads program is one of the largest undertakings ever seen across regional NSW," Member for Murray said.

"These are important (upgrades) for all the community from producers to tourists."