Mount Jefferson is a stratovolcano in the Cascade Volcanic Arc, part of the Cascade Range in the U.S. state of Oregon. 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. Due to the ruggedness of its surroundings, the mountain is one of the hardest volcanoes to reach in the Cascades. It is also a popular tourist destination despite its remoteness, with recreational activities including hiking, backpacking, mountaineering, and photography. Vegetation at Mount Jefferson is dominated by Douglas fir, silver fir, mountain hemlock, ponderosa pine, lodgepole pine, and several cedar species. Carnivores, insectivores, bats, rodents, deer, birds, and various other species inhabit the area.
Three Fingered Jack is a summit of a shield volcano of the Cascade Range in the U.S. state of Oregon. Formed during the Pleistocene epoch, the mountain consists mainly of basaltic andesite lava and was heavily glaciated in the past. While other Oregon volcanoes that were heavily glaciated—such as Mount Washington and Mount Thielsen—display eroded volcanic necks, Three Fingered Jack's present summit is a comparatively narrow ridge of loose tephra supported by a dike only 10 feet (3.0 m) thick on a generally north–south axis. Radiating dikes and plugs that support this summit have been exposed by glaciation. The volcano has long been inactive and has been highly eroded.
Mount Washington is a deeply eroded volcano in the Cascade Range of Oregon. It lies within Deschutes and Linn counties and is surrounded by the Mount Washington Wilderness area.
The North Santiam River is a 92-mile (148 km) tributary of the Santiam River in western Oregon in the United States. It drains 766 square miles (1,980 km2) of the Cascade Range on the eastern side of the Willamette Valley east of Salem.
The Willamette National Forest is a National Forest located in the central portion of the Cascade Range of the U.S. state of Oregon. It comprises 1,678,031 acres (6,790.75 km2). Over 380,000 acres are designated wilderness which include seven major mountain peaks. There are also several National Wild and Scenic Rivers within the forest. The forest is named for the Willamette River, which has its headwaters in the forest. The forest headquarters are located in the city of Springfield. There are local ranger district offices in McKenzie Bridge, Detroit, Sweet Home, and Westfir.
Santiam Pass is a 4,817-foot (1,468 m) mountain pass in the Cascade Range in central Oregon in the United States. It is located on the border between Linn and Jefferson counties, about 18 mi (29 km) northwest of Sisters, between the prominent volcanic horns of Three Fingered Jack to the north and Mount Washington to the south. Several other smaller volcanoes, including cinder cones and tuyas, are found near the summit of the pass. U.S. Route 20 connects eastern Oregon with the valley of the Santiam River on the west via Santiam Pass. One of the 19 or 20 lakes by the name of Lost Lake is located beside the highway just west of Santiam Pass. The pass may be approached from the west by three distinct routes:
The Breitenbush River is a tributary of the North Santiam River in western Oregon in the United States. It drains a rugged, forested area of the Cascade Range east of Salem.
The Mount Hood National Forest is 62 miles (100 km) east of the city of Portland, Oregon, and the northern Willamette River valley. The Forest extends south from the Columbia River Gorge across more than 60 miles (97 km) of forested mountains, lakes and streams to the Olallie Scenic Area, a high lake basin under the slopes of Mount Jefferson. The Forest includes and is named after Mount Hood, a stratovolcano. The Forest encompasses some 1,067,043 acres (4,318.17 km2). Forest headquarters are located in Sandy, Oregon. A 1993 Forest Service study estimated that the extent of old growth in the Forest was 345,300 acres (139,700 ha). The Forest is divided into four separate districts - Barlow, Clackamas River (Estacada), Hood River, and Zigzag (Zigzag).
The Bull of the Woods Wilderness is a wilderness area located in the Mount Hood National Forest in the northwestern Cascades of Oregon, United States. It was created in 1984 and consists of 37,607 acres (15,219 ha) including prime low-elevation old-growth forest, about a dozen lakes of at least 1-acre (4,000 m2) and many large creeks and streams. Adjacent areas, including Opal Creek Wilderness to the west, create a pristine area of nearly 84 square miles (218 km2). There are at least ten trailheads and 60 miles (97 km) of trail.
The Opal Creek Wilderness is a wilderness area located in the Willamette National Forest in the U.S. state of Oregon, on the border of the Mount Hood National Forest. It has the largest uncut watershed in Oregon.
The Deschutes National Forest is a United States National Forest located in parts of Deschutes, Klamath, Lake, and Jefferson counties in central Oregon. It comprises 1.8 million acres (7,300 km2) along the east side of the Cascade Range. In 1908, the Deschutes National Forest was established from parts of the Blue Mountains, Cascade, and Fremont National Forests. In 1911, parts of the Deschutes National Forest were split off to form the Ochoco and Paulina National Forests, and parts of the Cascade and Oregon National Forests were added to the Deschutes. In 1915, the lands of the Paulina National Forest were rejoined to the Deschutes National Forest. A 1993 Forest Service study estimated that the extent of old growth in the forest was 348,100 acres (140,900 ha). Within the boundaries of the Deschutes National Forest is the Newberry National Volcanic Monument, containing cinder cones, lava flows, and lava tubes. The Deschutes National Forest as a whole contains in excess of 250 known caves. The forest also contains five wilderness areas, six National Wild and Scenic Rivers, the Oregon Cascade Recreation Area, and the Metolius Conservation Area. Forest headquarters are located in Bend, Oregon. There are local ranger district offices in Bend, Crescent, and Sisters.
The Middle Santiam Wilderness is a wilderness area located near Mount Washington in the central Cascade Range of Oregon, U.S., within the Willamette National Forest.
The Mount Jefferson Wilderness is a wilderness area located on and around Mount Jefferson in the central Cascade Range of Oregon in the United States. It is situated where the Willamette, Deschutes, and Mount Hood National Forests meet. Mount Jefferson Wilderness is the second most visited Oregon wilderness area after the Three Sisters Wilderness.
Hoodoo Butte is a cinder cone butte in the Cascade Range of northern Oregon, located near Santiam Pass. Immediately to the east lies Hayrick Butte, a prime example of a tuya; the two mountains' names were likely mistaken for each other, but stuck with them over time. The area has been subjected to a number of historic fires. Hoodoo is sometimes considered a subfeature of the Mount Washington shield volcano, and it forms part of the Sisters Reach, which extends from South Cinder Peak to Crane Prairie Reservoir, running for 56 miles (90 km). This region has a high vent density, with many mafic volcanoes of Pleistocene to Holocene age, such as Hoodoo. While Hoodoo has an intact summit crater that was blocked from erosion by glaciers, it has an irregular topography, giving it an open appearance.
Hogg Rock is a tuya volcano and lava dome in the Cascade Range of northern Oregon, 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.
The Cascades ecoregion is a Level III ecoregion designated by the United States Environmental Protection Agency (EPA) in the U.S. states of Washington, Oregon, and California. Somewhat smaller than the Cascade mountain range for which it is named, the ecoregion extends north to Snoqualmie Pass, near Seattle, and south to Hayden Pass, near the Oregon-California border, including the peaks and western slopes of most of the High Cascades. A discontiguous section is located on Mount Shasta in California.
Marion Lake is an alpine lake located in Linn County of the U.S. state of Oregon. The lake is in central Oregon's Cascades within the Mount Jefferson Wilderness. The lake is approximately 300 acres (1.2 km2), at an elevation of 4,134 feet (1,260 m).
The B&B Complex fires were a linked pair of wildfires that together burned 90,769 acres (367.33 km2) of Oregon forest during the summer of 2003. The fire complex began as two separate fires, the Bear Butte Fire and the Booth Fire. The two fires were reported on the same day and eventually burned together, forming a single fire area that stretched along the crest of the Cascade Mountains between Mount Jefferson and Mount Washington. On the western side of the Cascades, the fire consumed mostly Douglas-fir and western hemlock. On the eastern side of the mountains, the fire burned mostly Ponderosa pine, lodgepole pine, and jack pine. Most of the burned area was on public land administered by the United States Forest Service including 40,419 acres (163.57 km2) within the Mount Jefferson Wilderness. The fire also burned forest land on the Warm Springs Indian Reservation and small areas of state and private land. Firefighters battled the blaze for 34 days. At the peak of the firefighting effort, there were over 2,300 personnel working on the fire. Although the cost of fire suppression was over $38 million, no lives were lost and no homes burned as the fire was largely in wilderness areas.
The South Fork Breitenbush River is a 10-mile (16 km) tributary of the Breitenbush River in the U.S. state of Oregon. The river flows generally northwest from Russell Lake in the Mount Jefferson Wilderness of the Cascade Range to near Breitenbush Hot Springs, where it merges with the North Fork Breitenbush River to form the main stem.
