We stayed for three nights at Tower Fall Campground in June 2016. This campground is first-come-first-serve and fills remarkably fast. If you don't arrive by 6:30am to get a site, you may as well look elsewhere. As the name states, this campground is located near Tower Falls, which is just south of the Tower Junction. This campground is very, very small and we would not recommend it to anyone with an RV over 25 feet. Ours is a 17-foot trailer, and we had to change sites twice just to find one level and long enough to fit. The fellow campers at this campground were very helpful in rearranging for us to find a site that worked. In general, the campground was quiet even though it is compact.
That said, our stay was still very nice, and it scores high for the location. There is a general store just below the campground. As with all Yellowstone campgrounds, wildlife WILL wander through so be prepared with bear spray and stay aware of bison and elk. We had a bison wander through one evening during dinner, and we were forced to head in to our camper for about 60 minutes to let him pass by. It was fun to watch through the window!
Price for this campground is much less expensive than the reservable ones, but if you need a campground in summer time and have no reservation, we recommend this one for short stays.