A geological survey published in 1883 said this landmark was “regular in its operations” that “occur … frequently”
On the December 8, 2025 episode of Jeopardy!, the Final Jeopardy clue came from the category Around the U.S.A. The clue referenced a well-known natural phenomenon and read: “A geological survey published in 1883 said this landmark was ‘regular in its operations’ that ‘occur…frequently.’” This clue directed contestants to think about notable natural landmarks in the United States known for predictable behavior.
What is Old Faithful?
Old Faithful is one of the most famous geysers in the world and a major attraction at Yellowstone National Park in Wyoming. Its fame largely stems from its highly predictable eruptions, which occur approximately every 90 minutes. The 1883 geological survey highlighted this consistent activity, noting that its eruptions happened regularly and could be anticipated, which made it a standout feature in the region long before the park became the heavily visited tourist destination it is today.
The geyser was given the name “Old Faithful” in 1870 by the Washburn-Langford-Doane Expedition, and its reliability has made it one of the most studied geothermal features in the United States. Even over 150 years later, its eruptions are still closely monitored and remain remarkably regular, although slight variations do occur due to natural geothermal shifts.
A Geological Marvel with Historical Recognition
The 1883 survey marked an important step in formal scientific observation of Yellowstone’s geothermal features. At the time, geysers were still considered mysterious and relatively undocumented phenomena. Survey teams from the U.S. Geological Survey began methodically studying Yellowstone, and Old Faithful quickly became a benchmark due to its consistent behavior and accessibility.
This early recognition played a key role in making Yellowstone the first national park in the world. The government and scientists saw the value in protecting unique natural features like Old Faithful, and documentation from these early surveys provided critical justification for its preservation.
A Symbol of Yellowstone National Park
Old Faithful is often viewed as the symbol of Yellowstone National Park, which spans portions of Wyoming, Montana, and Idaho. It was the first national park established in the United States, created by an act of Congress in 1872. As tourism developed in the late 19th and early 20th centuries, Old Faithful became the focal point for many early visitors, with the Old Faithful Inn opening nearby in 1904 to accommodate the growing influx of tourists.
The area remains one of the most visited parts of the park. Its accessibility and relatively frequent eruptions make it a centerpiece of Yellowstone’s geothermal attractions, which also include other geysers, hot springs, mudpots, and fumaroles scattered throughout the park.
Science Behind the Predictability
Old Faithful’s eruptions are driven by underground reservoirs of water heated by volcanic activity beneath Yellowstone. As pressure builds from the superheated water, the geyser erupts, releasing a column of steam and water that can reach heights of over 100 feet. After the eruption, the reservoir refills and reheats, setting the stage for the next burst.
Over time, scientists have used seismic, thermal, and hydrologic tools to study Old Faithful. While still consistent, its average interval between eruptions has gradually increased over the past century, likely due to shifts in subterranean water supply caused by earthquakes and other geothermal changes.
Conclusion: A Landmark of Natural Reliability
Old Faithful’s reputation as “regular in its operations” remains well-deserved, more than a century after that 1883 survey described its frequency. It stands not only as a remarkable geological feature but also as a historic icon that helped shape the national park movement in the United States. Its ongoing activity continues to draw millions of visitors annually and offers scientists invaluable insights into geothermal dynamics beneath the Earth’s surface.