A few years ago we were at the Sturgis Rally(2nd week Aug) and on a lark, I called Fishing Bridge to see if we could get in ..... they had a cancellation that worked for us. FB is in a central location to tour Yellowstone without the hassle of staying outside the park and commuting in. Sure, the sites are close together, but you are not at FB for the camping experience, but to use it as a base to explore Yellowstone. The rangers also have nightly talks nearby... that all being said, we are going to Grizzly this year for a different experience.