Mt. Jefferson is the dominant feature of this High Cascades area, along with Three Fingered Jack (7,841 feet). Mt. Jefferson's slopes are mantled by five glaciers: Whitewater, Waldo, Milk Creek, Russell, and Jefferson Park. Other geographic features include steep talus slopes, rock outcrops, and alpine meadows. There are over 150 lakes, many stocked with trout.
Mt. Jefferson Wilderness covers 111,177 total acres. There are 163 miles of trail within this wilderness including a 40 mile stretch of the Pacific Crest Scenic Trail.
Vegetation is predominantly Douglas-fir, silver fir, sub-alpine fir, mountain hemlock, lodgepole pine, ponderosa pine, several species of cedar as well as species like vine maple, huckleberry and rhododendron.
At a Glance
Access: The most popular entry points are the Pacific Crest National Scenic Trail #2000 and Summit Trail #4041 from Highway 20 at the south end; Marion Lake Trail #3436 off Road 2255; Pamelia Lake Trail #3439 off Road 2246, 13 miles southeast of Detroit; Pacific Crest National Scenic Trail #2000 from Breitenbush Lake in the north; Duffy Lake Trail #3427, off Road 2267.
Popular east side entry points are Cabot Lake Trail #3437 and Road 1234 at Jack Lake; Jefferson Lake Trail #4001, from Road 1292; Whitewater Trail #3429, off Road 2243.
For trail information see: