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  A-1 Geyser
Feature Type: Geyser
Geyser/Spring Type: Fountain geyser

Basin
Lower Geyser Basin
Complex
Great Fountain and White Creek Group

Historically A-1's activity interchanged with A-2. When one was active the other was dormant to nearly dormant. Botryoidal Spring has taken over the activity of both A-1 and A-2, which are currently considered to be dormant. When active A-1 reaches 6 feet for 5-10 minutes and intervals are about 30-40 minutes apart.

Note that pedestrian access to this geyser is currently illegal because of the Park's closure of the White Creek Trail. It's visible from the road between the Firehole Spring parking lot and the larger lot for Great Fountain Geyser. Park in one of these lots and enjoy the view (if and when it starts up again), but respect the barriers and stay off the trail.

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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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