Firefighters continue to battle a wildfire that has grown to 19,100 acres in the Coronado National Forest near Safford in southeastern Arizona.

Forest officials said Monday that the Grapevine Fire now is 75 percent contained. That’s up from 10 percent Sunday when the fire was at about 8,000 acres.

Officials say the blaze is burning at low elevation in grass and brush. The lightning-caused fire began Thursday. No structures have been destroyed and no evacuations ordered.

State Route 266 has been reopened. Drivers should use caution when driving the route, as there will be slow traffic due to firefighters patrolling the road for hot spots, the Forest Service said in a news release. There may also be periodic smoke obscuring vision along the route.