A state of emergency has been declared in the Municipal District of Bighorn, west of Cochrane as crews continue to battle a wildfire.

The wildfire, north of Canmore has changed in status from controlled to out-of-control.

The wildfire is in the Forest Reserve at Devil's Head.

The fire was started by an abandoned campfire and has been burning for weeks.

It had been contained, but as of this morning, the fire is now situated 20 km west of the hamlet of Benchlands.

According to Alberta Emergency alert, residents in the following regions should be prepared to evacuate.

Richard's Road
Highway 40
Summer village of Waiparous
Benchlands
Richard's and Pears Road
Ghost Country Place
West Jamieson Road