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Yellowstone National Park

Riverside Geyser

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Riverside Geyser in Yellowstone National Park

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Riverside Geyser

Riverside Geyser has one of the most picturesque settings of any geyser. Riverside is a cone-type geyser. Its interval is usually 5 1/2 to 7 hours, its height about 75 feet and its duration about 1/2 hour. The water phase of the eruption lasts about 20 minutes and is followed by a steam phase.

You watch Riverside from a viewing area across the Firehole river from the geyser. From this position, Riverside's formation looks something like a chair. There is a vent high up on the back and another vent in the seat of the chair. Except for some minor splashing, the geyser erupts from the lower vent in the seat of the chair. About 1 1/2 to 2 hours before the eruption the main vent in the seat of the chair begins to overflow into the river. This overflow is variable. About an hour later, the small vents behind the main vent will begin to bubble and boil. The activity fluctuates but seems to build as time progresses. Finally a splash or two will be seen in the upper vent at the top of the chair back. One of these splashes will be large enough to spill water into the river, this usually starts the eruption.

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