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WEATHER
Black Pool
Hot Spring
in
Lower Group
,
West Thumb Geyser Basin
on
Yellowstone Lake
on
West Thumb Geyser Basin Trail
in
Yellowstone NP
,
Rocky Mountains
near
Grant Village
,
WY
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On Wikipedia
Black Pool is a hot spring in the West Thumb Geyser Basin of Yellowstone National Park in the United States. The pool was cool enough up until 1991 for dark orange-brown cyanobacteria to grow throughout the pool. When combined with the blue of the water, the pool appeared to be an exceptionally dark green to almost black, hence the name. An exchange of function took place in 1991, shifting thermal energy to Black Pool and nearby Abyss Pool, causing them to heat up. Black Pool's temperature became hot enough to kill all the cyanobacteria in the pool, turning the pool a rich teal blue color. The pool also had frequent boiling eruptions on August 15, 1991, doming the water to 3 feet and causing heavy runoff. Black Pool remains extremely hot, and is now one of Yellowstone's most beautiful and…
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Hot Spring
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Yellowstone Lake
Lake
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