Gus D.
Yelp
Yes, it is tight at Fishing Bridge RV Park. That is why I give it 3 stars. But when choosing a place to stay to see Yellowstone, you should decide what your main goals are. If you wish to see as much of the park as possible in the time you have, you should stay inside the park. Because of traffic, terrain, and the vast number of sites, it takes more time to travel 10 miles than what we are used to. Also, the speed limit for most areas of the park is 45 mph. So, it is difficult to stay in West Yellowstone or Cody (for examples) and see very much in a couple or three days without spending a lot of time driving to and from. Fishing Bridge RV Park is the only park inside that offers full utilities. If you don't need electricity, water, etc., then other campgrounds will give you a better camping experience while letting you still be in the park.
One tip I can offer is that some sections of the campground were better than others. The sections are laid out in loops (A through G, I think). As you go farther back, higher loop sections, the roads were quite rough and the camping experience seemed worse, at least to me. We camped on the B loop, which had smooth paved roads and was fairly organized. We had a "small" area outside our RV to cook, sit, etc. also, there was an area to park our tow vehicle.
You need reservations to get into this park and most others. You are taking a huge chance if you don't have them. If choosing Fishing Bridge, I suggest asking to be put in sections A, B, or C. I don't know if they will do it but it does not hurt to ask. Also, there is a good gift store with a few groceries, a service station, and an auto/ RV repair shop at Fishing Bridge. A camp neighbor had a problem with his tow vehicle and benefited greatly from the repair facility.