To answer your question, yes, Fishing Bridge is a fine place to stay in August. Yes, it's like a paved lot and the spaces are close together, but it has full hookups and is centrally located in the park.
The campgrounds like Grizzly RV Park and the West Yellowstone KOA are superior in amenities and quality of stay, but driving in and out of Yellowstone to the campground can easily add an hour or more each way to get to the major attractions.
We have stayed both in and out of the park. We prefer staying inside, and Madison campground is a beautiful non-hookup campground centrally located and Fishing Bridge is a good choice for full hookups, pay showers & laundry mat. The draw to Yellowstone is the park, so the campground experience is usually limited to eating dinner and sleeping.
Enjoy Yellowstone!
Army 11 Bravo - Gulf War Veteran
Wife, Two Teen Boys, Hound Dog (Daisy) & Beagles (Lily & Bailey)
2014 Springdale 267SRTWE Bunkhouse Travel Trailer
2009 Chevy Silverado Crew Cab 4x4