ReneeG, I would think that, if you arrive at Colter Bay Campground after 9:00 am and before 11:00 am, which is check-out time, you'll find a camp spot that you will like. We went there, for the second time this year, after the 4th of July and ran into the longest entry line we have ever encountered, however, we got a very nice spot and after all those people checking in, the campground was not full. I would think the traffic would settle down a bit after the Eclipse broohaha and you should have a great chance to score a nice camp site.