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Sawmill Geyser

Sawmill Geyser's eruptions are highly variable, some lasting only 9 minutes while others may last over 4 hours. The typical interval between eruptions is 1 - 3 hours. Overall it is erupting about 30% of the time. Sawmill received its name because water spins in its crater as it erupts looking somewhat like the rotating circular blade of a lumber mill. The water of Sawmill Geyser spins in its crater during an eruption.
 
Photo © Matthew McLean

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Last Updated: Saturday, 01-Jul-2006 23:59:41 Eastern Daylight Time
http://www.nps.gov /archive/yell/tours/oldfaithful/sawmill.htm