United States UGB - Grotto Geyser

3 images 1 contributors

Lewis Kemper

About This Spot

Grotto Geyser has one of the most unique cones of all the geysers. It is thought that the cone was shaped when the sinter was deposited over a stand of dead trees and that the remaining stumps have become petrified in the geyserite. Grotto Geyser has two types of eruptions. “Normal” or “short mode” eruptions last between 1-3 hours followed by an interval of 5-8 hours. “Marathon” or “long mode” eruptions last between 12-24 hours with an average of 19 hours followed by an interval of about 2 days. So you have a good chance of seeing some activity in Grotto Geyser. The eruptions are not tall averaging around 10 feet (3.04m).

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