Old Faithful Geyser


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 is about 91 minutes, varying from 65 - 92 minutes. An eruption lasts 1 1/2 to 5 minutes, expels 3,700 - 8,400 gallons (14,000 - 32,000 liters) of boiling water, and reaches heights of 106 - 184 feet (30 - 55m). It was named for its consistent performance by members of the Washburn Expedition in 1870. Although its average interval has lengthened through the years (due to earthquakes and vandalism), Old Faithful is still as spectacular and predictable as it was a century ago. The largest active geyser in the world is Steamboat Geyser in the Norris Geyser Basin.

*Adapted from the NPS Old Faithful Area Trail Guide and the NPS Old Faithful Area Interactive Map

Feature Type


Inventory ID

No inventory id for this feature


Latitude: 44.46031
Longitude: -110.8283
Survey Date: No survey date provided

Geographic Area: Firehole River Drainage
Thermal Region: Upper Geyser Basin
Thermal Complex: Old Faithful Group
Contact: Old Faithful Visitor Center (307) 344-2750

Feature Data

Data Source Supplied By Sample Date Temp Vent Temp pH Cond Extended Data
Park -- -- 0°C -- -- No
Download all data for this feature.