| Old Faithful | |
|---|---|
 Eruption of Old Faithful in 1948 | |
 | |
| Name origin | Named by Henry D. Washburn September 18, 1870 |
| Location | Upper Geyser Basin Yellowstone National Park Teton County, Wyoming, U.S. |
| Coordinates | 44°27′38″N 110°49′41″W / 44.46046°N 110.82815°W[1] |
| Elevation | 7,349 ft (2,240 m)[2] |
| Type | Cone geyser |
| Eruption height | 106 to 185 ft (32 to 56 m) |
| Frequency | 60 to 90 minutes |
| Duration | 1½ to 5 minutes |
| Discharge | 3,700–8,400 US gal (14,000–32,000 L) |
Old Faithful is a cone geyser in Yellowstone National Park in Wyoming, United States. It was named in 1870 during the Washburn–Langford–Doane Expedition and was the first geyser in the park to be named.[3][4] It is a highly predictable geothermal feature and has erupted every 44 minutes to two hours since 2000.[5] The geyser and the nearby Old Faithful Inn are part of the Old Faithful Historic District.
- ^ "Old Faithful". Yellowstone Geothermal Features Database. Montana State University.
- ^ "Old Faithful Geyser". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. June 5, 1978. Retrieved September 18, 2017.
- ^ Bauer, Clyde Max (1947). Yellowstone Geysers. Yellowstone Park, Wyoming: Haynes, Inc. OCLC 1517713.
- ^ Cite error: The named reference
tourwas invoked but never defined (see the help page). - ^ Old Faithful Archived February 21, 2012, at the Wayback Machine, Geyser Observation and Study Association, August 17, 2011; "National Park Service Webcam". www.nps.gov. Retrieved January 1, 2017.