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Geysers of the World   

Geysers of Yellowstone   



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

Upper Geyser Basin
Grotto, Riverside, Chain Lakes

Rocket Geyser erupts with Grotto Geyser. Only on extremely rare occasions has Rocket been reported to erupt by itself. During most of Rocket's eruption, it is not very spectacular. The eruption consists of continual splashing to at most 10 feet. But on occasion, Rocket can take over the entire eruption from Grotto Geyser and turn into a truly spectacular geyser. These Major eruptions start quickly, raising in a six foot wide column of water up to 50 feet into the air. The column then shrinks down to 25-30 feet and holds for a while before continuing to shrink and both geysers returning to their splashing play. The total duration of the major eruption is usually just short of 10 minutes.

What to look for:
Rocket Major eruptions almost exclusively occur during Grotto Geyser's short mode eruptions. They usually come 1.5 to 2 hours into the eruption but sometimes can come earlier or later. Often Grotto finishes its eruption soon after a Rocket Major but not always. Rarely, Rocket can have two eruptions during a Grotto short mode eruption.

Other than the time window, there is not much to look for prior to a Rocket Major. A good sign is a dying down of the activity in Grotto Geyser and larger splashing from Rocket. Once a Rocket Major starts, it takes over the entire eruption from Grotto and Grotto falls completely silent. Towards the end of the major eruption, Grotto slowly starts to come back to life.

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These pictures show major eruptions of Rocket Geyser. Notice Grotto's cone formation to the right of the above picture.

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Click for a larger image

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

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