The visitor center and a wastewater treatment plant were among the 50 to 80 structures lost, the park superintendent said. The area was evacuated Thursday.

The Dragon Bravo Fire has destroyed dozens of structures and a water treatment facility, and the White Sage Fire, located in Kaibab National Forest, has forced hundreds to evacuate.

The Grand Canyon Lodge was among "numerous" historic structures to burn as two wildfires in northern Arizona triggered evacuations amid hot, dry and gusty conditions, officials said Sunday.