Mount Hood | |
---|---|
Highest point | |
Elevation | 11,249 ft (3,429 m) NAVD 88[1] |
Prominence | 7,706 ft (2,349 m)[2] |
Listing | |
Coordinates | 45°22′25″N 121°41′45″W / 45.37361°N 121.69583°W[1] |
Geography | |
Location | Clackamas / Hood River counties, Oregon, U.S. |
Parent range | Cascade Range |
Topo map | USGS Mount Hood South |
Geology | |
Age of rock | More than 500,000 years[3] |
Mountain type | Stratovolcano |
Volcanic arc | Cascade Volcanic Arc |
Last eruption | 21 September 1865 to January 1866[4] |
Climbing | |
First ascent | July 11, 1857, by Henry Pittock, W. Lymen Chittenden, Wilbur Cornell, and the Rev. T. A. Wood[5] |
Easiest route | Rock and glacier climb |
Mount Hood is an active stratovolcano in the Cascade Volcanic Arc. It was formed by a subduction zone on the Pacific coast and rests in the Pacific Northwest region of the United States. It is located about 50 mi (80 km) east-southeast of Portland, on the border between Clackamas and Hood River counties. In addition to being Oregon's highest mountain, it is one of the loftiest mountains in the nation based on its prominence, and it offers the only year-round lift-served skiing in North America.
The height assigned to Mount Hood's snow-covered peak has varied over its history. Modern sources point to three different heights: 11,249 ft (3,429 m), a 1991 adjustment of a 1986 measurement by the U.S. National Geodetic Survey (NGS),[1] 11,240 ft (3,426 m) based on a 1993 scientific expedition,[6] and 11,239 ft (3,425.6 m)[7] of slightly older origin. The peak is home to 12 named glaciers and snowfields. It is the highest point in Oregon and the fourth highest in the Cascade Range.[8] Mount Hood is considered the Oregon volcano most likely to erupt,[9] though based on its history, an explosive eruption is unlikely. Still, the odds of an eruption in the next 30 years are estimated at between 3 and 7%, so the U.S. Geological Survey (USGS) characterizes it as "potentially active", but the mountain is informally considered dormant.[10]
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