A lightning-caused wildfire has now burned two thousand acres on the north rim of the Grand Canyon.

The Galahad Fire was discovered May 23 on the Walla Valley Peninsula. Grand Canyon National Park officials say weather conditions are challenging firefighters.

The fire is now a quarter mile away from a historic cabin and lookout tower, but fire management officials say both structures are well-protected. Potential fuel has been cleared away, and the cabin has been wrapped with material used to make fire shelters.

Crews planned to focus Monday on stopping the blaze from crossing a road on the western side of the fire. But officials say they’re mostly letting the fire burn on its southern and western sides, using the blaze to clear out years of accumulated fuel.

About 150 people are fighting the wildfire, including three hotshot crews.

The Park Service says smoke is visible north of the park in Fredonia and from the canyon's south rim.

Updated 6/2/2014 at 2:44 p.m.

The Associated Press contributed to this report.