Giantess Geyser


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

Feature Type


Inventory ID



Latitude: 44.46354
Longitude: -110.8289
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

Feature Data

Data Source Supplied By Sample Date Temp Vent Temp pH Cond Extended Data
Park 10/5/1998 90.4°C 0°C 8.55 2000 µS/cm No
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