Semi-Centennial Geyser is located just north of
Roaring Mountain
Roaring Mountain () is in Yellowstone National Park in the U.S. state of Wyoming. Roaring Mountain was named for the numerous fumarole
A fumarole (or fumerole) is a vent in the surface of the Earth or other rocky planet from which hot volca ...
in
Yellowstone National Park
Yellowstone National Park is an American national park located in the western United States, largely in the northwest corner of Wyoming and extending into Montana and Idaho. It was established by the 42nd U.S. Congress with the Yellowston ...
in the
U.S. state
In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its sover ...
of
Wyoming
Wyoming () is a U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Montana to the north and northwest, South Dakota and Nebraska to the east, Idaho to the west, Utah to the south ...
.
Situated next to the Grand Loop Road, the geyser was first noticed when it had a few small eruptions in 1919. A few years later at 6:40am on August 14, 1922 the geyser erupted in the first of a series of increasingly violent eruptions. By the afternoon on the same day reports stated that the ejected water was exceeding in height. By the evening of the 14th, the geyser had scattered debris and rocks a distance of from the crater. Short lived, Semi-Centennial Geyser has been quiet since and a small pool of water now exists where the geyser erupted.
As the geyser showed its biggest activity in 1922, the 50th anniversary of the establishment of Yellowstone National Park in 1872, it was accorded the name of Semi-Centennial.
References
{{Wyoming
Geothermal features of Yellowstone National Park
Geysers of Wyoming
Geothermal features of Park County, Wyoming