Black Pool

I know, I know.  It’s not black.  That is the name, though, of this very hot pool.

It used to be black.  Lower water temperature allowed thick mats of dark green and brown thermophiles (heat-loving microorganisms) to grow in the pool, causing it to appear black.  In 1991, the water temperature rose, killing the thermophiles.  It also erupted as a geyser that summer and several times the following winter.  Black Pool is now a quiet and beautiful pool.

2010 08 04 e 006panoed

Posted from Old Faithful Inn, Yellowstone National Park

Comments on this entry are closed.

  • Becky in VA Aug 6, 2010 @ 12:13

    Such a gorgeous pool of water. I love this color. Beautiful picture!

  • Mike Aug 15, 2010 @ 19:50

    Becky – Thanks! It’s even neater in person.

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