A rockslide has temporarily closed the road between Mammoth Hot Springs and Tower Junction in Yellowstone National Park. Rocks and debris were discovered early Saturday morning, covering a section of road at the entrance to Blacktail Plateau Drive, about eight miles east of Mammoth Hot Springs. While much of the debris covering the road was cleared by 9:00 am, park managers remain concerned about the threat posed by a large amount of loose rock and dirt above the roadway, which could easily dislodge and fall. Engineers with the Federal Highway Administration are being brought in to assess the condition of the road. Barricades have been set-up on both sides of the slide area. The road is currently open for emergency travel only. It is unknown when the road may be safe to reopen to travel by area residents, visitors, and park employees. The cause of the early morning rockslide is unknown.