Three Sisters Wilderness

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Three Sisters Wilderness
IUCN category Ib (wilderness area)
Proxy Falls.JPG
Proxy Falls
Location Lane / Deschutes counties, Oregon, USA
Nearest city Sisters, OR (20 miles NE)
Bend, OR (20 miles E)
Coordinates 44°05′00″N 121°57′00″W / 44.08333°N 121.95000°W / 44.08333; -121.95000Coordinates: 44°05′00″N 121°57′00″W / 44.08333°N 121.95000°W / 44.08333; -121.95000
Area 286,708 acres (1,160 km²)
Established January 1, 1964
Governing body U.S. Forest Service

The Three Sisters Wilderness is a wilderness area in the Cascade Range, within the Willamette and Deschutes National Forests in Oregon. It comprises 286,708 acres (1,160.27 km2), making it the second largest Wilderness area in Oregon. It was established by the United States Congress in 1964 and is named for the Three Sisters, three volcanoes.[1]

Oregon Route 242 separates the Three Sisters Wilderness from the Mount Washington Wilderness to the north, while the Waldo Lake Wilderness shares the southern boundary.[1]

Geology[edit]

Many types of landforms make up the wilderness area, but the most common are volcanic features, the most notable being the Cascades which are stratovolcanoes having formed around 1.6 million years ago.[2] Numerous cinder cones have formed on their flanks as well as many lava flows that contain hundreds of lava tubes.[3]

Topography[edit]

South Sister

The Three Sisters Wilderness ranges in elevation from 2,000 to 10,358 feet (610 to 3,157 m). The Three Sisters—North Sister at 10,085 feet (3,074 m), Middle Sister at 10,047 feet (3,062 m), and South Sister at 10,358 feet (3,157 m)—are found in the eastern portion of the Wilderness. Including Broken Top just to the south at 9,175 feet (2,797 m), there are 14 glaciers offering one of the best examples of the effects of glaciation in the Pacific Northwest. Collier Glacier, between North and Middle Sister, is the largest glacier in Oregon.[1] The headwaters of the Wild and Scenic Whychus Creek (formerly Squaw Creek[4]) emerge in the Wilderness.[1]

Vegetation[edit]

Forest cover in the Three Sisters Wilderness includes Douglas fir, Pacific silver fir, subalpine fir, mountain hemlock, western hemlock, lodgepole pine and ponderosa pine. A large area of the Wilderness above timberline contains alpine meadows.[5]

Recreation[edit]

Popular recreational activities in the Three Sisters Wilderness include camping, hiking, rock climbing, and fishing. More than 260 miles (420 km) of trails cross the Wilderness, including 40 miles (64 km) of the Pacific Crest Trail.[5] The 9.8-mile (15.8 km) French Pete Trail and its surrounding old-growth forest, a nationwide political issue in the 1970s, are located west of the Cascade crest and within the wilderness.[6] The South and Middle Sisters are not technically difficult climbs, but the North requires technical expertise and equipment.

Three Sisters with Broken Top partially obscuring Middle Sister. Taken from Paulina Peak.

See also[edit]

References[edit]

  1. ^ a b c d Three Sisters Wilderness - Wilderness.net
  2. ^ "Geologic Provinces of the United States: Pacific". USGS. Retrieved July 6, 2013. 
  3. ^ Matt Skeels. "The Caves of Central Oregon". Oregon High Desert Grotto. Retrieved July 6, 2013. 
  4. ^ "Forest Service Proposes Central Oregon Name Changes". United States Forest Service. August 19, 2005. Retrieved September 8, 2008. 
  5. ^ a b Three Sisters Wilderness - Willamette National Forest
  6. ^ Sullivan, William L. 100 Hikes in the Central Oregon Cascades (2004 ed.). Eugene, Oregon: Navillus Press. pp. 158–159. ISBN 0-9618152-6-4. 

External links[edit]