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West Thumb
Geyser Basin

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Twin Geysers

Twin Geysers are connected, placid pools when not in eruption.

Twin Geysers - click to open larger image
Twin Geysers - click to erupt

Twin Geysers—one geyser with two vents—has short periods of dramatic eruptions and extended periods of dormancy. After a 23-year dormancy, it began erupting again in 1998; its last known eruption was in 1999. Visitors lucky enough to witness an eruption see a two-part event. The west vent erupts 70 feet (21 meters), then the east vent erupts more than 100 feet (30 meters).


West Thumb Geyser Basin Tour

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Last Updated: Wednesday, 22-Dec-2004 10:11:50 Eastern Standard Time
http://www.nps.gov /archive/yell/tours/westthumb/twingeysers.htm