Two wildfires are burning in Box Elder County, including one that started early Friday in Hansel Valley, where the Stratos data center and energy campus is planned.

That blaze, the Salt Wells Fire, started before 6 a.m. Friday and was “growing rapidly,” according to Utah Fire Info. No structures were threatened, but officials said around 8 a.m. that a state task force was on its way from Salt Lake City to help fight flames.

By Friday evening, it had burned about 585 acres and was considered 60% contained, officials said. A containment figure marks the portion of a fire’s perimeter where crews are confident the flames won’t cross.

Officials called the update “great progress” despite triple-digit temperatures and breezy conditions, which can make flames unwieldy.

“Thank you to the firefighters and support crews working hard to keep the fire under control,” Utah Fire Info shared on X.

Elsewhere in Box Elder County, the separate Little Mountain Fire sparked Thursday afternoon.

It’s burning north of the Bear River Migratory Bird Refuge, and south of Tremonton.

As of Friday, it had reached 560 acres and was considered 75% contained, fire officials said.

The Box Elder County Landfill, which temporarily closed Thursday to make room for emergency vehicles responding to the Little Mountain Fire, reopened Friday.

The cause of both fires is unknown, fire officials said.