Fire crews are fighting a 2-acre fire along the popular McKenzie River trail about 70 miles from Eugene, according to the National Forest.

The fire was reported by a resident there at about 3:45 p.m. Wednesday, McKenzie River Ranger District spokeswoman Joanie Schmidgall said to the Register-Guard. The cause of the fire is under investigation.

Willamette officials have closed six miles of the trail between Trail Bridge Campground and Carmen Reservoir, cutting off access to Blue Pool.

“We realize this is a very popular destination for bikers and hikers,” Fire management officer for the National Forest’s McKenzie River Ranger District Randy Harbick said in a statement, “This closure is in place to protect firefighter and public safety. We will open the McKenzie River Trail and Blue Pool as soon as possible.”

Officials expect the closure to last through Thursday and possibly into the weekend.