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Giantess Geyser, a fountain-type geyser, earns its mighty name during its violent and infrequent eruptions. Multiple water bursts reach between 100 - 200 feet (30-60 m) high. Eruptions generally occur 2 - 6 times a year. The surrounding area may shake from underground steam explosions just before the initial water and/or steam eruptions. Eruptions may occur twice hourly, experience a tremendous steam phase, and continue activity for 4 - 48 hours.
*Adapted from the NPS Old Faithful Area Trail Guide and the Old Faithful Area Interactive Map
Survey Date: October 5, 1998
Geographic Area: Firehole River Drainage
Thermal Region: Upper Geyser Basin
Thermal Complex: Geyser Hill Group
Ranger District Contact: Old Faithful District, Colleen Rawlings (307) 344-2701
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