I posted this a few days ago on another thread but it fits here so I'll repost it:
The rock slide just above Asheville will probably send you on a detour on I-40 to NC226 back up to the Parkway.
If you want to make the detour a curve carving motorcycle adventure try this:
Exit on US74east to Bat Cave (if it is chow time consider continuing into Lake Lure for food)
NC9 north for 6.3 miles
Old Fort Road north back to either I-40 or US70
Even if they do open the Parkway I'd still use this route. 74 is a blast!