Diamond Peak (Oregon)
| Diamond Peak | |
|---|---|
Diamond Peak volcano in October 2005, with the smaller Mount Yoran to the right | |
| Highest point | |
| Elevation | 8,748 ft (2,666 m) NAVD 88 |
| Prominence | 3,104 ft (946 m) |
| Coordinates | 43°31′15″N 122°08′58″W / 43.520696292°N 122.149582933°W |
| Geography | |
| Parent range | Cascades |
| Topo map | USGS Diamond Peak |
| Geology | |
| Rock age | Less than 100,000 years |
| Mountain type(s) | Shield volcano with a stratocone, stratovolcano |
| Volcanic arc | Cascade Volcanic Arc |
| Last eruption | More than ~11,000 years ago, but less than 100,000 years ago |
| Climbing | |
| First ascent | 1852, John Diamond and William Macy |
| Easiest route | Hike or climb |
Diamond Peak is a volcano in Klamath and Lane counties of central Oregon in the United States. It is a shield volcano, though it might also be considered a modest stratocone. Diamond Peak forms part of the Cascade Volcanic Arc, a segment of the Cascade Range in western North America extending from southern British Columbia through Oregon to Northern California. Reaching an elevation of 8,748 feet (2,666 m), the mountain is located near Willamette Pass in the Diamond Peak Wilderness within the Deschutes and Willamette national forests. Surrounded by coniferous forest and visible in the skyline from foothills near Eugene, Diamond Peak offers a few climbing routes and can be scrambled. Diamond Peak is one of Oregon's Matterhorns.
The volcano, consisting mostly of basaltic andesite, has relatively steep slopes and an andesitic volcanic cone that contains pyroclastic materials at its core. The mountain has a number of subfeatures including Mount Yoran, Lakeview Mountain, and a number of cinder cones. Diamond Peak was thoroughly eroded by glaciers and has several cirques as a result.