The Griffy Fire, about four miles northwest of Murphy in Owyhee County, was reported Thursday.
The U.S. Bureau of Land Management has fire crews on scene, according to posts on the agency’s Twitter account. The fire was estimated at 350 acres at around 12:30 p.m.
BLM spokeswoman Carrie Bilbao said crews are making good progress, aided by air support including single-engine air tankers and one heavy air tanker. The fire is tentatively believed to be human-caused; investigators are on scene.
“As far as firefighting, it’s not easy access,” she said of the area.
Trails in the West Rabbit Creek area, west of Murphy, have been closed due to the fire.
Southwest Idaho — particularly Owyhee County — has already seen several sizeable fires this season, and dry conditions and expected record-high temperatures in the near future mean additional fire risk, Bilbao noted. She asks that the public be cautious when out recreating in the coming weeks, and notes that fireworks are prohibited on public lands.