Watching Old Faithful Geyser erupt is a Yellowstone National Park tradition. People from all over the world have journeyed here to watch this famous geyser. The park’s wildlife and scenery might be as well-known today, but it was the unique thermal features like Old Faithful Geyser that inspired the establishment of Yellowstone as the world’s first national park in 1872.
Old Faithful is one of nearly 500 geysers in Yellowstone and one of six that park rangers currently predict. It is uncommon to be able to predict geyser eruptions with regularity and Old Faithful has lived up to its name, only lengthening the time between eruptions by about 30 minutes in the last 30 years.
Thermal features change constantly and it is possible Old Faithful may stop erupting someday. Geysers and other thermal features are evidence of ongoing volcanic activity beneath the surface and change is part of this natural system. Yellowstone preserves the natural geologic processes so that visitors may continue to enjoy this natural system.
Watch eruptions from the Old Faithful viewing area or along the boardwalks that weave around the geyser and through the Upper Geyser Basin.
The Old Faithful Inn was designed by Robert C. Reamer, who wanted the asymmetry of the building to reflect the chaos of nature. It was built during the winter of 1903-1904. The Old Faithful Inn is one of the few remaining log hotels in the United States. It is a masterpiece of rustic architecture in its stylized design and fine craftsmanship. Its influence on American architecture, particularly park architecture, was immeasurable.
The building is a rustic log and wood-frame structure with gigantic proportions: nearly 700 feet (213 m) in length and seven stories high. The lobby of the hotel features a 65-foot (20-m) ceiling, a massive rhyolite fireplace, and railings made of contorted lodgepole pine. Stand in the lobby and look up at the exposed structure, or walk up a gnarled log staircase to one of the balconies. Wings were added to the hotel in 1915 and 1927, and today there are 327 rooms available to guests in this National Historic Landmark.
The average interval between eruptions of Old Faithful Geyser changes; as of February 2019, it is 98 minutes ± 10 minutes, with intervals ranging from 79 to 109 minutes. Old Faithful can vary in height from 106 to more than 180 feet (32.3-54.8 m), averaging 130 feet (40 m). Eruptions normally last between 1½ to 5 minutes and expel from 3,700 to 8,400 gallons (14,000-31,800 l) of water. At the vent, water is 203ºF (95.6ºC).
Since its formal discovery in 1870, Old Faithful has been one of the more predictable geysers. Over time, the average interval between eruptions has increased, in part due to ongoing processes within its plumbing. Changes also result from earthquakes. Prior to the Hebgen Lake Earthquake (1959), the interval between Old Faithful’s eruptions averaged more than one hour. After the earthquake, it started erupting with two distinct intervals-a short and a long one. Its average interval increased. After the 1983 Borah Peak Earthquake, centered in Idaho, it increased again. In 1998, an earthquake near Old Faithful lengthened the interval again; subsequent earthquake swarms further increased intervals. Sometimes the average interval decreases.
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