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Mount Jefferson has 35 snow and ice features, including four named glaciers: Whitewater, Jefferson Park, Russell, and Waldo.These features, for the most part on the northern, eastern, and southeastern parts of Mount Jefferson, span elevations from 6,158 to 8,189 feet (1,877 to 2,496 m) and cover an area of 2.1 square miles (5.5 km 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).
The flood on August 21, 1934, at a lake formed near Whitewater Glacier, created a debris flow that reached the Whitewater River drainage and buried parts of Jefferson Park in 1 to 8 feet (0.30 to 2.44 m) of debris; another event took place in 1957, but was poorly documented.
With a width of 16 miles (25 km), it differs from the adjacent northern segment of the Cascades, where volcanoes show a scattered distribution.
Other unusual features of the Jefferson Reach include that the northernmost 19 miles (30 km) of the strip does not include many volcanoes formed since the early Pleistocene and that it features a number of andesitic and dacitic volcanoes, which are unlike the many mafic (rich in magnesium and iron) shield volcanoes within the stretch.
Carnivores, insectivores, bats, rodents, deer, birds, and various other species inhabit the area. The surrounding area contains a number of other volcanic features like cinder cones, shield volcanoes, and tuyas (flat-topped, steep-sided volcanoes formed when lava erupts through a thick glacier or ice sheet).
Also known as Seekseekqua by Native American populations, the volcano was named after United States President Thomas Jefferson, and was first ascended by E. It has not erupted within the past 20,000 years, and is considered a low threat by the United States Geological Survey.
Mount Jefferson is a stratovolcano in the Cascade Volcanic Arc, part of the Cascade Range in the U. Due to the ruggedness of its surroundings, the mountain is one of the hardest volcanoes to reach in the Cascades.
The second highest mountain in Oregon, it is situated within Linn County, Jefferson County, and Marion County and forms part of the Mount Jefferson Wilderness.
Other bird species found in the area consist of Eurasian three-toed woodpeckers, willow flycatchers, olive-sided flycatchers, tree swallows, gray jays, Steller's jays, common ravens, Clark's nutcrackers, black-capped chickadees, mountain chickadees, chestnut-backed chickadees, red-breasted nuthatches, pygmy nuthatches, Eurasian treecreepers, American dippers, wrens, American robins, varied thrushes, hermit thrushes, Townsend's solitaires, golden-crowned kinglets, ruby-crowned kinglets, water pipits, blue-headed vireos, western tanagers, Cassin's finches, gray-crowned rosy finches, pine siskins, red crossbills, green-tailed towhees, dark-eyed juncos, white-crowned sparrows, golden-crowned sparrows, fox sparrows, and Lincoln's sparrows.
Long-toed salamanders, California giant salamanders, rough-skinned newts, tailed frogs, western toads, Pacific tree frogs, northern red-legged frogs, Oregon spotted frogs, pygmy short-horned lizards, common garter snakes, and northwestern garter snakes make up some of the amphibious and reptilian animals in the vicinity.
Within this region, basaltic vents occur at Olallie Butte, Potato Butte, Sisi Butte, North Cinder Peak, and South Cinder Peak, with basaltic lava flows at Cabot Creek, Jefferson Creek, and upper Puzzle Creek.
There are several hundred other basaltic volcanoes within the central Oregon High Cascades, extending up to 110 miles (180 km) away.
Vegetation at Mount Jefferson is dominated by Douglas-fir, silver fir, mountain hemlock, ponderosa pine, lodgepole pine, and several species of cedar.