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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.

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