In Depth - Predicting Old Faithful

Duration:

4 minutes, 41 seconds

Old Faithful was once called “Eternity’s Timepiece” because of the regularity of its eruptions. However, this geyser never erupted at exact hourly intervals as many believe. Ranger Darlene Bos explains how we predict eruptions for this popular geyser. Additional filming by David Restivo and Jay Elhard.

 

Predict Old Faithful

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Hydrothermal Features

More than 10,000 hydrothermal features are found here, of which more than 500 are geysers.

Current Geyser Activity

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Old Faithful FAQs

Is Old Faithful slowing down. Learn that and more.

In Depth: Geysers

Learn about the mechanics of geysers, their role in the park's history and what they teach us about the world in which we live.