Old Faithful is Yellowstone`s most popular sight.
The Washburn expedition in 1870 named Old Faithful for its nearly regular schedule of eruptions. It is the grand old geyser of Yellowstone because of its frequent and predictable eruptions.
The intervals between eruptions average between 45-90 minutes and the average duration is about four minutes. Temperature is 199F. Height 110-185 feet.
Old Faithful from away, during one of her eruptions.
(info: http://www.yellowstone.com)
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