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West Thumb
Geyser Basin

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Blue Funnel Spring

Blue Funnel Spring

Blue Funnel Spring was long known for the distinctive ring of color around its perimeter. However, when Abyss pool began erupting during the winter of 1991-92, the water in Blue Funnel, and in adjacent Perforated Pool and Ephedra Spring, cooled and sank well below the rim. Then the four features appeared to exchange energy: Abyss stopped erupting at the end of that winter, while these features were rejuvenated.


West Thumb Geyser Basin Tour

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Last Updated: Wednesday, 22-Dec-2004 10:11:42 Eastern Standard Time
http://www.nps.gov /archive/yell/tours/westthumb/bluefunnel.htm