Yellowstone National Park Campgrounds Professional Review and Guide
"Camping in Yellowstone National Park can become a test of nerves for the unprepared. Each year the number of visitors grows, putting an even greater strain on the available camping. The increasing size of RV units also creates a very frustrating problem for campers and rangers alike. The campgrounds were originally constructed with pickup campers and tents in mind.
No one at that time ever dreamed that the huge trailers and buses of today would seek a parking area for camping. The more popular areas find visitors waiting for campers to leave in the morning. Reservations can be made in five out of the twelve campgrounds, but some already have been reserved as early as eighteen months in advance.
This eTrail contains detailed descriptions of the following campgrounds: Madison, Grant Village, Lewis Lake, Bridge Bay, Fishing Bridge RV Park, Canyon Village, Mammoth, Indian Creek, Norris, Tower Fall, Slough Creek, and Pebble Creek."