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Geysers of the World   

Geysers of Yellowstone   



  Fountain Geyser
Feature Type: Geyser
Geyser/Spring Type: Fountain geyser

Lower Geyser Basin
Fountain Group

Fountain is a beautiful geyser. Its 30 minute eruptions can reach over 75 feet and are characterized by highly energetic bursts that wildly explode in all directions. It is a very fun geyser to watch. Since Morning Geyser is usually dormant, Fountain is usually the major performer in the area. It usually erupts every 4 to 15 hours.

What to look for:
In the past Fountain would erupt after the pool filled to nearly overflowing. Lately Fountain gives no such warning and erupts from an empty crater. The best way to see this amazing geyser is to know the current interval and when the last eruption took place.

Electronic Monitor Files
Fountain Geyser eruptions for 2000.txtFountain Geyser eruptions for 2001.txt
Fountain Geyser eruptions for 2002.txtFountain Geyser eruptions for 2003.txt
Fountain Geyser eruptions for 2004.txtFountain Geyser eruptions for 2005.txt
Fountain Geyser eruptions for 2006.txtFountain Geyser eruptions for 2007.txt
Fountain Geyser eruptions for 2008.txtFountain Geyser eruptions for 2009.txt
Fountain Geyser eruptions for 2010.txtFountain Geyser eruptions for 2011.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 Recorded by Data Logger - by Ralph Taylor  

A data logger has been deployed at Fountain Geyser since late August of 2000. We have attempted to obtain a continuous record of Fountain’s activity since that time, but the record has several gaps caused by equipment failure or our inability to recover the data in wintertime. There are gaps from 21 May to 20 June in 2001, 21 February to 23 March 2003, 6 March to 8 April and 23 May to 3 July in 2004, 19 January to 18 March 2005, 2 February to 2 March and 30 March to 21 April 2006, 15 January to 21 March 2007, and 7 January to 28 February 2008. In 2009 there are gaps from 23 February to 1 March due to the logger filling, and from 15 April to 29 May due to the logger filling when access to the area was not allowed because of the bear closure.

Activity in 2011  
The overall statistics for 2011 are shown at Fountain Geyser 2011 Statistics. A pdf of this summary is at Fountain Geyser Recent Activity Summary.

The activity of Fountain Geyser in 2011 is shown in the graph at the right. The blue line shows all of the eruption intervals and the yellow line shows the 1-day moving median interval. The graphs for the current year are updated about every six weeks from October to June and weekly from June to the end of September.

Since the end of 2010 Fountain has become more variable in both interval and duration.

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The second graph expands the time line for the past three months.
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The next graph shows Fountain's intervals for the month prior to the most recent download.
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The next graph shows the interval distribution for 2011. The width of the peak shows the uncertainty in intervals. Blue shows the intervals for the whole year to date, maroon shows the previous month, and yellow the previous week. 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 60 minutes. The bar appearing above the label "5:30," for example, contains intervals from 5h01m through 5h30m.
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The graph at the right shows Fountain's eruption durations for the year to date.
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The next graph shows the duration distribution for 2011. Blue shows the intervals for the whole year to date, maroon shows the previous month, and yellow the previous week.
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The monthly statistics graph shows the maximum, mean, median, and minimum intervals for each month. This chart summarizes the range and gives another perspective on the activity. The minimum value is an indication of how soon after the previous eruption one must arrive at Fountain to be (relatively) sure to see the next eruption and the difference between the minimum and maximum suggests how long the wait could be.
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Activity since August 2000  
One way to present the eruption interval data is to graph the interval as a function of time. The graph shown at the right shows all of the electronically recorded intervals since 2000.
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The interval graph shows the large variation in interval from one eruption to the next. Often a better idea of the change in intervals over time can be seen from the graph of the 1-day moving median intervals, shown at the right.
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The graph at the right shows Fountain's interval statistics on a month by month basis, including the maximum, minimum, mean, and median intervals for each month.
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Activity in 2010
Activity in 2009
Activity in 2008
Activity in 2007
Activity in 2006

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

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