Abbeyard fire has grown to 75,700 hectares and has a 426 permieter but Ovens operations manager Adam Green said they are "taking advantage of conditions" while they can.

"The main task we have been undertaking over the last couple of days, really successfully, has been the implementation of a large blackburn heading north back towards Bright to try and get a greater level of protection to the community," he said.

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"Fire is progressing towards that line but it is managing to achieve depth of 300 to 400 metres from the top of the ridge which we are really comfortable with.

"Crews have been maintaining a 24 hour focus there."

United States firefighters have been working in the Mount Buffalo plateau area undertaking containment lines and hand trails but access has been a problem.

"The challenge is the plateau is a large granite outcrop so trying to get in there is very difficult - we have built a couple of helipads to give us greater access to that area," Mr Green said.

"Over out into the Whorouly and Carboor area we have currently got some challenging conditions to the west of this fire but we are working hard to bring that under control with a backburn in around the Mount Emu area."

More than 200 firefighters, 50 bits of machinery and more than 15 aircraft are on the fire ground.