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Grand Geyser Grand Geyser is consistently the tallest and most spectacular of the predicted geysers. This excitement doesn't come without a cost though. It has the largest prediction window of the predicted geysers. Even so, it is worth waiting to see.Grand erupts from a pool of water making it a fountain-type geyser as opposed to Old Faithful which is a cone-type geyser. Grand's interval is usually around 8-12 hours, its height about 150-180 feet and its duration is about 10-12 minutes. It will often stop after about 9 minutes and then restart after a minute or so. This second "burst" and any subsequent bursts are often among the tallest if not the tallest of the eruption. Be sure to wait and see if there is a second burst. It is easy to get confused when looking for Grand Geyser. Of course, the Park Service has put out a sign to help you but the first thing most people notice is the large raised rim around nearby Turban Geyser and they miss the large flat pool just to the right of Turban. This large pool, with almost no rim, is Grand Geyser. Grand is closely related to Turban Geyser. During the hours prior to an eruption of Grand, Turban erupts approximately every 20 minutes. When Grand Geyser erupts, it does so just before or after the start of an eruption of Turban Geyser. If Grand doesn't start at this time, you'll have to wait another 20 minutes for the next eruption of Turban and hope Once Grand erupts, there is the possibility of more than one burst. A Grand burst is defined as the continuous eruption of water. The shorter the first burst, preferably less then 10 minutes, the more likely it is that you will see a second, third or even more bursts. (The most bursts seen in one eruption during the last few years is 11 but the average is usually 2 to 4.) After a burst has ended, watch Grand's pool. Sometimes the water will be out of sight, sometimes it will still be visible. Watch to see if the water rises. If the water rises and begins to bubble be prepared for a spectacular sight as Grand erupts to its full height in one continuous motion. If the water drops, well, there's always the next eruption.
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