description Semi-Centennial Geyser Overview
Semi-Centennial Geyser is a currently inactive thermal feature near the road north of Roaring Mountain in Yellowstone National Park. It received its name after powerful eruptions in 1922, the fiftieth anniversary year of the park's establishment, reportedly opened a large crater and threw debris around the site. The feature is chiefly of historical and geological interest as an example of how Yellowstone's hydrothermal activity can change abruptly.
help Semi-Centennial Geyser FAQ
Where is Semi-Centennial Geyser located in Yellowstone National Park?
Semi-Centennial Geyser is located north of Roaring Mountain in Yellowstone National Park. It sits directly along the main park road. This makes it a notable geologic feature for passing visitors, even though it is rarely active today.
How did Semi-Centennial Geyser get its name?
It received its name following major eruptions in 1922. The year 1922 marked the semi-centennial, or 50th anniversary, of Yellowstone being established as the world's first national park in 1872. The massive eruptions were a highlight of the park's jubilee celebrations.
Is Semi-Centennial Geyser currently active?
No, Semi-Centennial Geyser is considered inactive and has not experienced significant eruptions in many decades. Visitors today will mostly see a quiet crater or occasional minor steam activity depending on the season. It acts more as a steaming pool than a predictable geyser.
How large were the historical eruptions of Semi-Centennial Geyser?
During its major 1922 eruptions, the geyser was reported to blast water an impressive 150 feet into the air. These massive displays are what originally drew the attention of the park's early geologists. Such eruptions have not been seen since the 1920s.
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