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Old Faithful Geyser
Photo taken at Yellowstone National Park. The mathematical average between eruptions of Old Faithful is currently 74 minutes, but it doesn't like to act average! Intervals can range from 60-110 minutes. Old Faithful can vary in height from 100-180 feet with an average near 130-140 feet. This has been the historical range of its recorded height. Eruptions normally last between 1.5 to 5 minutes. Information source: yellowstonepark.com.
Old Faithful Geyser
Photo taken at Yellowstone National Park. The mathematical average between eruptions of Old Faithful is currently 74 minutes, but it doesn't like to act average! Intervals can range from 60-110 minutes. Old Faithful can vary in height from 100-180 feet with an average near 130-140 feet. This has been the historical range of its recorded height. Eruptions normally last between 1.5 to 5 minutes. Information source: yellowstonepark.com.