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Elevation is an important geographical term that refers to how high a location is in relation to sea level. The elevation of Mt Hood has actually changed quite a lot over the years as different surveys have taken place and the technology and methods used to determine the elevation of mountains and other high points have changed. The official elevation of Mt Hood is 11,249 feet (3,429 m), which was calculated by a United States National Geodetic Survey in 1991, using the NAVD 88 system.
The first attempt to measure the elevation of Mt Hood took place back in 1854, with members of Thomas J. Dryer's expedition claiming that the mountain had an elevation of 18,361 feet (5,596 m), much higher than the current official measurement. Other 19th century climbers and explorers gave Mt Hood different elevations including 14,000 feet (4,300 m) and 17,600 feet (5,400 m), but the most accurate measurement of the 19th century came in 1867, when a Colonel Williamson deemed that Mt Hood had an elevation of 11,225 feet (3,421 m).
For a long time, Mt Hood was believed to have the highest elevation of any point in North America, but this quickly changed when it was discovered that the mountain was nowhere near as high as first believed. The actual highest point in North America is Denali, which has an elevation of 20,310 feet (6,190 m) above sea level, making it almost twice as tall as Mt Hood. Hundreds of other mountains around the continent are taller than Mt Hood, but it is still the point of highest elevation in its native state of Oregon and, due to its high prominence, it can be seen from distances of up to 100 miles away.