Firefighters with the Bureau of Land Management are working a 10-acre grass fire burning on private land near Hilltop along Idaho Highway 21 Wednesday afternoon.

The fire isn’t threatening any structures, and no evacuations have been ordered.

At 3 p.m., the west lane of the highway was closed but traffic was being permitted through.

The fire was reported at 1 p.m. Wednesday, according to Ada County Dispatch.

BLM fire officials say the fire was human-caused but it remains under investigation. Crews are working hotspots along the perimeter, and they expect to have it under control by 2 p.m. Thursday.

At one point, Idaho 21 was shut down between Hilltop and High Bridge but by 2 p.m., one lane of the highway was re-opened, a dispatcher said.

Last July, a grass fire that started about 300 yards south of Hilltop Station burned more than 4,300 acres. That fire was called the Mile Marker 14 fire.