A wildfire destroyed structures and forced evacuations Monday from the busiest area of Montana's Glacier National Park, as officials in California prepared to reopen Yosemite National Park following a two-week closure at the height of the summer season.

Meanwhile, a Utah firefighter died Monday battling a massive blaze in Northern California — the sixth fatality in a matter of weeks.

The fighter was injured and died at a hospital, state fire officials said, but provided no further details.

Firefighters from many states are on the lines in California, which has seen a series of deadly and devas...