CAVE JUNCTION — Highway 46 leading to the Oregon Caves National Monument is now open after emergency crews have doused a series of fires.

CAVE JUNCTION — Highway 46 leading to the Oregon Caves National Monument is now open after emergency crews have doused a series of fires.

The largest of those fires was reported to be five acres, burning in tall, dry grass on both sides of the road.

Oregon Department of Transportation crews closed the road from milepost 0 to 19 because of thick smoke in the area.

"The smoke caused traffic hazards in the area," Oregon State Police Sgt. Steve Mitchell said.

Four smaller fires, the largest of which measured a quarter acre in size, were quickly lined and doused by emergency crews.

The 90-degree temperatures and 15-mph wind gusts caused the fires to grow quickly in size. They briefly threatened barns and other structures before being extinguished, Ballou said.

"That combination caused quite a bit of excitement out there today," Ballou said.

The road was reopened by 5 p.m., though ODF crews would remain vigilant in the area into the evening, Ballou said.

The cause of the fires remains under investigation, Ballou said.