By the numbers Old Faithful

20: Number of times a day the geyser erupts

74 minutes: Average time between eruptions

204: Temperature in degrees Fahrenheit of the water at the vent during an eruption

3,700: Estimated gallons of water expelled during an eruption that lasts 1 1/2 minutes

130 to 140: Height in feet of an average eruption

Source: www.nps.gov/yell

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