The bridge is the third oldest in Australia, and already has state heritage listing.

Ross resident and member of the Friends of Ross group Kim Peart said it had been thought the bridge already had national heritage status.

"The Ross bridge is extremely unique in that it has carvings along all of its arches, there's no other bridge in the world like this," he said.

Mr Peart organised a small event on Sunday to consider the heritage potential of the bridge and to share plans for the project with other residents.

The bridge would require national heritage listing before it could be considered for world heritage listing.

Mr Peart plans to lodge the application for national listing himself by February next year.

"We will be seeking support letters to go with that," he said.

"The [Northern Midlands] council have said they will give us a support letter for the application."