| Hogg Rock | |
|---|---|
 | |
| Highest point | |
| Elevation | 4,823 feet (1,470 m) |
| Coordinates | 44°25′19″N 121°52′37″W / 44.4220636°N 121.8770044°W[1] |
| Geography | |
  Hogg Rock Location in Oregon | |
| Location | Linn County, Oregon, U.S. |
| Parent range | Cascades |
| Topo map | USGS Three Fingered Jack |
| Geology | |
| Rock age | About 80,000 years[2][3] |
| Mountain type(s) | Tuya, lava dome |
| Last eruption | Pleistocene |
| Climbing | |
| Easiest route | Hike |
Hogg Rock is a tuya volcano and lava dome in the Cascade Range of northern Oregon, United States, located close to Santiam Pass. Produced by magma with an intermediate andesite composition, it has steep slopes and thick glassy margins. Hogg Rock exhibits normal magnetic polarity and is probably about 80,000 years old.
Hogg Rock lies south of Three Fingered Jack and north of Hayrick Butte, a somewhat larger tuya of similar age and composition. A tuya is a type of subglacial volcano, formed when lava erupts underneath an overlying glacier or ice sheet and then melts through to the surface and pools, producing the flat plateau on top with near-vertical walls along the ice-contact margin as the lava cools and hardens. It is a historic landmark, with the remnants of Colonel T. Egenton Hogg's Oregon Pacific Railroad, the Santiam Lodge, and a quarry. The mountain offers snowshoe and snowmobile trails, and its summit provides views of the surrounding area including volcanoes like the Black Butte stratovolcano, Mount Washington, Sand Mountain, and Potato Hill.
- ^ "Hogg Rock". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. November 9, 2018. Retrieved November 9, 2018.
- ^ Sherrod et al. 2004, p. 42.
- ^ Sherrod et al. 2004, p. 22.