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Yellowstone National Park - Grand Geyser

Location of sign - Upper Geyser Basin near Old Faithful in Yellowstone National Park

Photo taken June 2008

Close-up view of sign

Wide view of sign

Text of sign:

Grand Geyser

World's Tallest Predictable Geyser

Known for the height and beauty of its eruptions, Grand Geyser's activity is linked with that of nearby geysers.  An intricate 

sequence of events that takes place over 7 to 15 hours culminates in explosions of boiling water and steam from Grand's pool.

A full eruption can last from 9 to 12 minutes and reach heights of 180 feet or more.

Fast facts:

Grand Geyser is a fountain-type geyser.

Grand's eruptions occur in one or more bursts from its crater or pool.  There is a short wait between bursts.

Turban Geyser erupts every 15-22 minutes.  Grand erupts at the onset of one of Turban's eruptions.

The Grand "Group"

The prominent sinter bowl next to Grand Geyser is Turban Geyser.  A small crack left of Turban's sinter shoulder is Vent Geyser.

These three geysers share a subterranean source of hot water.

Turban Geyser erupts more frequently than the other two.  Grand will erupt just before or after Turban erupts.  The water level in

Grand fluctuates with each Turban eruption, usually dropping noticeably.  As an eruption of Grand Geyser nears, boiling water

surges over the rim of its pool.  Within seconds, Grand will erupt.  Finally, Vent Geyser comes to life, jetting water to heights of 75

feet.  Though Grand's eruptions last only about 10 minutes, Vent and Turban can continue to erupt for an hour or more.

This exhibit made possible by a generous grant from the Yellowstone Association.

Graphics on the sign

In addition to the text there is a picture of Grand Geyser erupting, a picture of its vent and a background picture of Vent Geyser,

Grand Geyser and Turban Geyser.

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