Photographs of Upper Geyser Basin, Yellowstone National Park
Wyoming > Yellowstone National Park > The Southwest > Upper Geyser Basin > Map and Tour > Photographs
Eruptions of Sawmill Geyser are spectacular though also quite variable, lasting from several minutes to 3 or 4 hours, separated by quiet periods of 1 to 3 hours. This activity is evident from the large, well established sinter formations around the vent, measuring 40 feet across. The geyser's name (bestowed in 1871) refers to the fierce grinding sound made during an eruption. When inactive the vent contains gently boiling, light blue water in a nearly pure white crater; the water level is low, not visible, just after an eruption, and gradually rises leading up to the next performance.
Back to map of the Upper Geyser Basin
Back to map of the Upper Geyser Basin
Keywords: Yellowstone National Park, Upper Geyser Basin, Wyoming, thermal features, geysers, hot springs, hot pools, boiling water
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