All of those parking lots are open. Be aware to many of them will get very busy on weekends in particular. You have to decide if you think that is safe or not. I guarantee the busiest lots will be Vivian Creek, San Bernardino, South Fork and Forsee Creek in that order. Momyer is usually not as crowded unless it gets overflow from Vivian Creek. Now that the road to Aspen Grove and Fish Creek has opened, those will be much less crowded than the others.
Hope that helps