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Black Pool at West Thumb Is Bright Blue in Color

Written by VacationIdea.com Travel Editors.

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The Old Faithful
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West Thumb Geyser Basin
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Black Pool at the West Thumb Geyser Basin is one of the most beautiful pools in Yellowstone National Park. It is bright blue in color with steam rising from its hot surface.

Black Pool got its name when it was actually black. Until 1991 water temperature in this pool was lower so that Black Pool was inhabited by dark green and brown thermophiles, which gave the pool black appearance. Water temperature rose in 1991, followed by several eruptions, which made Black Pool too hot for thermophiles.

Today, Black Pool is quiet and a feature attraction at the West Thumb Geyser Basin.