[39] The Mount Jefferson vicinity contains at least 40 of the 190 documented lava domes in the Oregon Cascades,[55] including the 7,159-foot (2,182 m) tall Goat's Peak dome;[49] it also contains monogenetic tuyas (flat-topped, steep-sided volcanoes formed when lava erupts through a thick glacier or ice sheet) and emplacements of hyaloclastite among mafic lava flows. [36], The central Oregon Cascades are made up of Eocene to Quaternary volcanic, volcaniclastic, igneous, and sedimentary rock. Jefferson does not lie in one of these grabens, but these tectonic processes continue, albeit at a less dramatic rate.

Parents refers to a larger category under which an object falls. Reaching an elevation of 10,497 feet (3,199 m), the volcano has a proximal relief of 4,890 feet (1,490 m). From there, hike uphill to the right (south) and pick up a faint trail near the ridge. Vegetation at Mount Jefferson is dominated by Douglas fir, silver fir, mountain hemlock, ponderosa pine, lodgepole pine, and several cedar species. [20] In 1937, Thayer analyzed Mount Jefferson's petrography and petrology from segments of the Western Cascades and High Cascades,[73] which he separated into local units. [28], Vegetation at Mount Jefferson is dominated by Douglas-fir, silver fir, mountain hemlock, ponderosa pine, lodgepole pine, and several species of cedar. Routes [6] The Warm Springs Tribal Council does not permit access to the volcano's eastern side, so only the western flanks can be used by the public. (12), Additions & Corrections [18] At their peak rates, the crustal extension and depression of the Cascades area caused eruption of the Minto Lavas, made of basalt, followed by the Santiam basalts, named for their movement into the North Santiam River valley, which they filled to depths of 600 feet (180 m). Vine maple, rhododendron, purple lupine, yellow lupine, Indian paintbrush, wild strawberries, and red huckleberries are also common around Mount Jefferson. [39] Jefferson — with Mount Hood, the Three Sisters-Broken Top area, and Crater Lake — represents one of four volcanic centers responsible for much of the Oregon Cascades' Quaternary andesite, dacite, and rhyolite deposits. Lahars (volcanically induced mudslides, landslides, and debris flows) and tephra could extend far from the volcano, and Mount Jefferson may also produce pyroclastic flows, lava domes, and lava flows. [33], Birds at Jefferson include mallards, northern goshawks, sharp-shinned hawks, red-tailed hawks, dusky grouses, grey partridges, killdeers, spotted sandpipers, California gulls, band-tailed pigeons, great horned owls, mountain pygmy owls, common nighthawks, rufous hummingbirds, Northern flickers, pileated woodpeckers, yellow-bellied sapsuckers, hairy woodpeckers, and white-headed woodpeckers. It is also a popular tourist destination despite its remoteness, with recreational activities including hiking, backpacking, mountaineering, and photography. [54], Volcanic activity in the vicinity of Mount Jefferson tends to originate from either stratovolcanoes that erupt for thousands of years or monogenetic volcanoes, which only erupt for brief periods of time. Whenever weather conditions change, Mount Jefferson snow conditions will change too, so it is important to check the time and date of the Mount Jefferson snow report and to guess what effect the weather will have had on snow quality between then and now.

[23], Wildfires occur within the wilderness area at Mount Jefferson. All Rights Reserved. [4] Rhyodacitic lava flows and pyroclastic material, which have since been significantly altered and stripped by glaciation, originated from eight vents in the area.

[39], Mount Jefferson may form part of a long-lasting intracrustal melting and magma storage area that encompasses an area of 12.4 by 5.0 miles (20 by 8 km), where relatively little mafic eruptive activity has occurred. Moreover, while basaltic lava flows from surrounding monogenetic vents tend to travel slowly and typically only reach 12 miles (19 km) from their source, and therefore would not pose serious hazards to much wildlife or humans, they would still burn and bury anything they encountered. Consisting of basaltic andesite, andesite, and dacite, the mountain has been extensively altered by glacial erosion. (74), Comments Also known as Seekseekqua by Native American populations, the volcano was named after United States President Thomas Jefferson, and was first ascended by E. C. Cross and R. L. Farmer in 1888.
Aconcagua mountain itself has many routes, photos, and trip reports as children. We advise that you check the Mount Jefferson snow forecast to see if conditions are likely to change before your visit. Find the best conditions for skiing and snowboarding near Mount Jefferson using our Snowfinder page. "[72], Mount Jefferson's glaciers were named by Oregon Bureau of Mines scientist Ira A. Williams in 1915, with former professor of geology at the University of Oregon, Edwin T. Hodge, publishing a report on the volcano's glaciers and geology in 1925. [19] In recent years, the glaciers have retreated to form lateral moraines; Whitewater Glacier, for example, shrunk from 5 miles (8.0 km) in width and 1 to 2 miles (1.6 to 3.2 km) in length to 1.9 miles (3.1 km) in width and a length of 0.62 miles (1 km).

It is not usually visible from the city of Portland, though it is visible on clear days from Salemand can be noticed from highways to both the east and the west of the Cascade Range. Hood a mere 1000 feet from our ski objective (the Wy’East Face) due to rain, wind, and general shit weather, we traveled south in search of redemption on Oregon’s 2nd highest volcano, Mt. [81] The Whitewater Trail runs north through the wilderness area for 1.5 miles (2.4 km) before reaching a junction, with the right path moving 2.5 miles (4.0 km) to the Pacific Crest Trail. Photo: Normal route on summit pinnacle dry (and crowded) conditions.

Due to the ruggedness of its surroundings, the mountain is one of the hardest volcanoes to reach in the Cascades. Jefferson Park Glacier provides a more varied and alpine route than is found on most of the volcanoes. Of course some people look for deteriorating conditions in the snow report for the likely development of mogul fields but for powder lovers and particularly snowboarders this can mean tracked out off-piste snow. from Mount Jefferson, Last Updated: 31 October 2020 at 20.00 GMT (Updates so far since 5 May: 339) The web's most comprehensive guide of ski resorts opening around the world during the pandemic. In the late summer to early fall of 2017, the Whitewater and Little Devil fires occurred.

[68] In addition to the hazards from eruptions at Mount Jefferson, other safety threats include debris avalanches and lahars, which could be caused without an eruption[62] as a result of the failure of glacial moraine dams; this has happened in the past at Jefferson. © 2006-2020 SummitPost.org.