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Yellowstone NP, Montana
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While Old Faithful is famous for its regular eruptions, Steamboat Geyser holds the record for the tallest active geyser in the world, reaching heights of up to 300 feet.
Old Faithful erupts approximately every 90 minutes, with intervals ranging from 60 to 110 minutes, making it one of the most predictable geysers in the park.
The first documented eruption of Old Faithful was in 1870, and it has been a major attraction ever since, with consistent records kept since the 1930s.
The reliability of Old Faithful is due to its unique underground plumbing system, which allows pressure to build up and release at regular intervals.
Eruptions typically last between 1.5 to 5 minutes, during which the geyser can shoot water up to 180 feet in the air.
Each eruption of Old Faithful releases between 3,700 to 8,400 gallons of boiling water.
While impressive, Old Faithful's water temperature is around 204°F, whereas some other geysers in the park can reach temperatures exceeding 250°F.
Old Faithful was named by the Washburn-Langford-Doane Expedition in 1870 due to its consistent and predictable eruptions.
Old Faithful is just one of over 500 geysers in Yellowstone, which is home to the largest concentration of geysers in the world.
