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Excelsior Geyser

Excelsior Geyser is actually not a geyser anymore, but rather a hot spring, though at one time it is belive to have been tha largest geyser in the world. Aside from two days of small eruptions in 1985, the last known eruptions occured in the 1880's. it is believed that these large eruptions caused a collapse in the internal plumbing system of the geyser, cutting off sufficient thermal energy to erupt, but still provides enough energy to discharge as a hot spring, churning out over 4000 gallons of water per minute from its pool into the Firehole River just below the ridge of its sinter. The ridge has several streams lined with colorful bacteria. The addition of this water, which flows out of the pool at a temperature of 199˚ F (93˚ C), raises the temperture of the Firehole River several degrees and can be as much as 18˚ F (10˚ C) warmer here than up river before it enters the geyser basin areas of Yellowstone. The river flows through the Upper Geyser basin and by the Biscuit Basin before reaching the Excelsior and the Midway Basin.

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Uploaded on December 3, 2010
Taken on June 27, 2010