Volcanic Springs

Geysers, Hot Springs,
Mud Pots, and Fumaroles

Firehole Lake Drive, Great Fountain Group

Five eye-catching groups of hydrothermal features are lined up along Firehole Lake Drive. Since it is a one-way road, visitors inevitably first come across the Great Fountain Group on the left side of the road and the White Creek Group on the right side.

First feature to the left is Lemon Spring, which is not known to be a geyser. It often exhibits a yellow rim of thermophilic bacteria around its blue-green bowl, hence the name.

Lemon Spring:

Lemon Spring Yellowstone

Lemon Spring Yellowstone
When you proceed east to the subsequent roadway turnout, Broken Egg Spring at its very beginning is easy to miss because Firehole Spring draws all attention to itself. Just like Lemon Spring, Broken Egg Spring is no geyser.

Broken Egg Spring:

Broken Egg Spring Yellowstone

Broken Egg Spring
Firehole Spring, one of the most colorful pools of Yellowstone, shows intermittent spouting caused by steam and gas bubbles.

Firehole Spring:

Firehole Spring Yellowstone

Firehole Spring
In the same way Surprise Pool is served by an own turnout. It's boiling, but has never been seen erupting.

Surprise Pool:

Surprise Pool Yellowstone

Surprise Pool Yellowstone
Great Fountain Geyser is the most popular feature at Firehole Lake Drive. It's one of the major geysers of Yellowstone, and eruption time predictions are usually available at the visitor center. Typically, intervals range from 8 to 15 hours. An upcoming eruption announces itself through a sequence of well-known events. Between 2 to 1 hours in advance, the water level of the central pool rises up to overflow, followed by a boiling around the edges only. A few minutes before the first burst the boiling briefly creates an up to 1 m (3 feet) high dome in center of the pool. Moments later an overwhelming spectacle takes place, which you have to see with your own eyes because a description can't do it justice.

Great Fountain Geyser, pool close to overflow:

Great Fountain Geyser Yellowstone

Great Fountain Geyser Yellowstone
Great Fountain's fan-shaped eruptions are simply magnificent, and on top of that the accessible observation area east and south of the geyser with the Lower Basin flat in background permits to see the up to 45 m (150 feet) high water column against the setting sun. Of course, this will succeed only if times of eruption and sunset coincide, that's the decisive factor. If you are very lucky, you may even witness a so-called "superburst", starting with a giant blue bubble and jetting up to 70 m (230 feet) high into the air.

Great Fountain Geyser erupting:

Great Fountain Geyser Yellowstone

Great Fountain Geyser Yellowstone

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