Black Pool

Hot spring in Yellowstone park, United States
44°25′05″N 110°34′19″W / 44.4179953°N 110.5718734°W / 44.4179953; -110.5718734[1]Elevation7,756 feet (2,364 m)[2]TypeHot SpringTemperature72.9 °C (163.2 °F)[1]
West Thumb Geyser Basin

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.[3]

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 intensely blue pools. The name of the pool remains "Black Pool."[4]

Images of Black Pool
  • Black Pool, 2006
    Black Pool, 2006
  • Black Pool, 2003
    Black Pool, 2003
  • Black Pool, 2013
    Black Pool, 2013

References

  1. ^ a b "Black Pool". Yellowstone Geothermal Features Database. Montana State University.
  2. ^ "Black Pool". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
  3. ^ "Black Pool". West Thumb Geyser Basin Tour. National Park Service. Archived from the original on 21 May 2010.
  4. ^ Scott, Bryan T. (1995). The Geysers of Yellowstone. Niwot, CO: University of Colorado Press. ISBN 0-87081-365-X.
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Yellowstone National Park – lake and environs
Historic structures and other attractions in the Yellowstone Lake, West Thumb, South and East Entrance areas
Structures and history
Yellowstone Lake Aerial
West Thumb Geyser BasinGeography and geology