Semi-Centennial Geyser, Thermal spring in Yellowstone National Park, United States.
Semi-Centennial Geyser is a thermal spring in Yellowstone National Park with acidic water reaching about 40 degrees Celsius (105 degrees Fahrenheit), descending roughly 3 meters (9 feet). It sits north of Roaring Mountain along the Grand Loop Road and forms part of the park's active geothermal landscape.
This spring was first noted in 1919 and reached its most intense activity in 1922, when it shot water up to 90 meters (300 feet) high. Over time it transformed from an explosive fountain type into the quieter pool visitors see today.
The name marks the 50th anniversary of Yellowstone National Park's founding and reflects how this place connects to America's natural heritage. Visitors see in this spring one of many geothermal features that define the park's character and draw people from around the world.
The spring is located right along the Grand Loop Road, making it easy to reach by car, though you will need to walk a short distance from the road. Keep a safe distance from the water due to the high heat and acidity, and pay attention to any marked safety areas.
This feature was once a spectacular fountain that shot water nearly 90 meters high and scattered debris across a wide area. The transformation into a smaller, quieter pool reveals how geothermal features in Yellowstone constantly shift and evolve.
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