Sawmill Geyser

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Sawmill Geyser
Yellowstone sawmillgeyser.jpg
Sawmill erupting
Name origin Named by Antoine Schoenborn during the 1871 Hayden Survey[1]
Location Upper Geyser Basin, Yellowstone National Park, Teton County, Wyoming
Coordinates 44°27′56″N 110°50′12″W / 44.465553°N 110.836618°W / 44.465553; -110.836618Coordinates: 44°27′56″N 110°50′12″W / 44.465553°N 110.836618°W / 44.465553; -110.836618
Type Fountain geyser
Eruption height up to 35 feet (11 m)
Frequency 1 - 3 hours
Duration 30 - 50 mins
Temperature 92 °C (198 °F)
Sawmill Geyser location in southern portion of Upper Geyser Basin.
Sawmill Geyser location in southern portion of Upper Geyser Basin.

Sawmill Geyser, named for the whirring sound it makes during its eruption, is a geyser in Yellowstone National Park, Wyoming, United States. The geyser was named by Antoine Schoenborn of the Hayden Geological Survey of 1871.

Sawmill is the largest geyser in the Sawmill Complex, a region of geothermal features located in Upper Geyser Basin approximately 10 feet off the path.[2] The geyser has an irregular pattern of eruption due to the underground structural interconnectivity which is characteristic of geyser complexes. Despite this, it tends to have a delay around 1 to 3 hours between eruptions. Often, Sawmill will erupt after the nearby Spasmodic Geyser, but only if Penta Geyser, another significant geyser in the complex, does not erupt first. If Penta erupts before Sawmill, Sawmill is cut off from water, and cannot erupt until the basin is reloaded, indicated by an eruption by Spasmodic. Another eruption indicator is when Sawmill fills with the rest of the geyser's water in the Sawmill Complex or starts to overflow, bubbles tend to rise to the surface. This indicates that an eruption is near. Sawmill drains after its eruptions, and if it had a large eruption prior, unusual behavior can occur in other geysers in the area.


Images of Sawmill Geyser
Approaching Sawmill - July 5, 2010 
Near Sawmill - July 5, 2010 
Sawmill Geyser spout - September 17, 2010 

See also[edit]


  1. ^ Whittlesey, Lee H. (2006). Yellowstone Place Names. Gardiner, MT: Wonderland Publishing Company. pp. 221–22. ISBN 1-59971-716-6. 
  2. ^ GOSA - Sawmill Geyser, GOSA's page on Sawmill