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Geysers of the World   

Geysers of Yellowstone   



  Pyramid Geyser
Feature Type: Geyser
Geyser/Spring Type: Cone geyser

Upper Geyser Basin
Daisy Group

Pyramid Geyser received its name from its proximity to the old hot spring cone known as the White Pyramid. The geyser itself is located on a flat geyserite platform to the northeast of the White Pyramid, visible to the right of the large cone as seen from the boardwalk near Daisy Geyser. The best place to view Pyramid Geyser is from the boardwalk past (to the west of) Splendid Geyser on the north side of the Daisy Group.

The distance from the boardwalk is such that the details of the formation cannot be seen, but the formation is visible as a flat platform to the right of the White Pyramid near a lone, small pine tree, as shown in the image.

What to look for:
Pyramid Geyser has erupted about every three hours between 1996 and 2009, but in 2010 has been erupting about every 4h45m. Eruptions are brief, lasting between 45 seconds and one minute. In 2010 most but not all eruptions have been preceded by minor play reaching about a foot in height about an hour before the eruption.

Both the minor activity and the full eruptions are preceded by increased steaming and some small splashing, which builds to a white mass of boiling water about a foot in height. This play either lasts a minute or so and then subsides, or builds rapidly to the 12-15 foot eruption.

Electronic Monitor Files
Pyramid eruptions for 1996.txtPyramid eruptions for 1997.txt
Pyramid eruptions for 1998.txtPyramid eruptions for 1999.txt
Pyramid eruptions for 2000.txtPyramid eruptions for 2001.txt
Pyramid eruptions for 2002.txtPyramid eruptions for 2003.txt
Pyramid eruptions for 2004.txtPyramid eruptions for 2005.txt
Pyramid eruptions for 2006.txtPyramid eruptions for 2007.txt
Pyramid eruptions for 2008.txtPyramid eruptions for 2009.txt
Pyramid eruptions for 2010.txt 

Some of the temperature data used to derive the eruption times and durations used in this section were collected by Ralph Taylor under a National Park Service research permit, and the remainder was collected by personnel working for the Geology Department of the Yellowstone Center for Resources (including Ralph Taylor). The loggers are a combination of loggers owned by the NPS and Ralph Taylor. Analysis of the raw temperature data to extract the eruption data was performed by Ralph Taylor. The eruption time files on this website may be used provided that Yellowstone National Park is credited for the temperature data and Ralph Taylor is credited for the eruption times.

Activity in 2010
Activity in 2009
Activity in 2008
Activity in 2007
Activity in 2006
Activity in 2005
Activity in 2004
Activity in 2003
Activity in 2002
Activity in 2001
Activity in 2000
Activity in 1999
Pyramid Geyser has been monitored electronically since 1996, but the monitoring has been done only in the summer months. The periods of electronic monitoring have ranged from two weeks to three months. No attempt has been made to monitor Pyramid Geyser over the winter months.

From the initial monitoring in 1996 to the 2009 season Pyramid's intervals were consistently around three hours. When monitoring resumed in June of 2010 intervals had increased to about 4h45m.

Activity in 1998  
Pyramid Geyser was monitored from 25 June to 07 October. The overall eruption interval statistics for Pyramid Geyser in 1998 are shown at Pyramid Geyser 1998 Statistics.

The chart at the right shows the activity recorded in 1998.
Click for a larger image

The next graph shows the interval distribution for 1998. The majority of intervals (91%) lie between 2h30m and 3h05m, substantially less widely scattered than the 1996 and 1997 distributions.

Note that in this and the other histograms displayed here the labels shown on the X-axis represent the upper boundary of the class, not the midpoint. Geyser times are traditionally truncated. The graph at the right has class widths of five minutes. The bar appearing above the label "3:00," for example, contains intervals from 2h55m through 3h00m.

Click for a larger image

Activity since 1996  
As the interval graph shows,the summertime activity of Pyramid Geyser was fairly consistend from 1996 to 2009. When logging resumed in 2010 however it became clear that a large change had occurred, with intervals jumping from about three hours to more varied intervals varying from four to six hours.
Click for a larger image

There is considerable variation in intervals in the previous graph. The next graph shows a one-day moving median interval, which removes some of the variation and reveals the long term trends more clearly. The daily median intervals started at three hours in 1996, dropped to just over 2h40m in 199802001, then returned to the three hour mark until 2005 when they dipped by about 10 minutes, returning to the under-three hour range for 2007-9. The large jump to more than 4h30m in 2010 is unprecedented in the time I have been monitoring this geyser.

Click for a larger image

The monthly minimum, mean, median, and maximum intervals further reveal the change in activity in 2010.
Click for a larger image

Activity in 1997
Activity in 1996

Please note - this site is currently under constuction. Please visit for more information.  Last update 01-29-2017

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