Old Faithful erupts more frequently than any of the other big geysers, although it is not the largest or most regular geyser in the park. Its average interval between eruptions varies from 60 - 110 minutes. An eruption lasts 1 1/2 to 5 minutes and reaches heights of 106 - 184 feet.

It was named for its consistent performance by members of the Washburn Expedition in 1870. Although its average interval has lengthened through the years, Old Faithful is still as spectacular and predictable as it was a century ago.

It's wonderland. Old Faithful and the majority of the world's geysers are preserved here. They are the main reason the park was established in 1872 as America's first national park - an idea that spread worldwide.

A mountain wildland, home to grizzly bears, wolves, and herds of bison and elk, the park is the core of one of the last, nearly intact, natural ecosystems in the Earth’s temperate zone.

Located in Wyoming, Montana, and Idaho, it is home to a large variety of wildlife including grizzly bears, wolves, bison, and elk.