A wildfire that leveled a historic lodge and a visitors center on the Grand Canyon’s North Rim grew rapidly more than a week after it began as firefighters pushed ahead Monday with efforts to slow its spread.

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.

A rapidly growing White Sage Fire, which started on July 9 approximately 15 miles southeast of Fredonia on Bureau of Land Management lands, has expanded to nearly 50,000 acres with zero containment as of July 14.