Old Faithful was the first geyser to be named in Yellowstone. It’s eruptions are not only fairly often but probably the most predictable within the park. It erupts about 17 times per day with an interval of 50 to 110 minutes. Short eruptions (less than 2.5 minutes) are typically followed by approximately 60 minute interval. Eruptions longer than 2.5 minutes are typically followed by approximately 90 minute interval.

Eruptions can shoot water as high as 185 feet; water temperature at the surface has been measured at 204°F with a steam temperature greater than 350°F.

I hardly need to point out that we have a faithful God.