Here's what we know about the two wildfires that have destroyed tens of thousands of acres of forest and burned at least 70 structures.

About 235 structures were in danger, or were already damaged or destroyed by the Dragon Bravo Fire, according to a preliminary structure loss report released by the Grand Canyon National Park on July ...

A water treatment facility at the North Rim had been compromised by the fire, causing chlorine gas to fall to the bottom of the Canyon.