US Forest Service announced (News Release) that for public safety, the Overmountain Shelter (aka Yellow Mountain barn) has been closed pending further evaluation of options for the structure and site management. Tent camping in the area is still allowed (and the privy remains open!).
No timeline has been set for the review and decision. The situation with the barn has been discussed and monitored for several years. Damage observed for a key support beam triggered the closure action.