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The Southern Cascades Slope ecoregion is a transitional zone between the Cascades ecoregion and the drier Eastern Cascade Slopes and Foothills, characterized by moderately sloping mountains with medium to high gradient streams. Elevation varies from 3,600 to 6,300 feet (1,100 to 1,900 m).
The Cascades is bordered on the north by the North Cascades ecoregion, on the south by the Klamath Mountains ecoregion, on the east by the Eastern Cascades Slopes and Foothills, and on the west by the Willamette Valley and Puget Lowland ecoregions. It been subdivided into six Level IV ecoregions in Washington and Oregon, as described below ...
The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as many of those in the North Cascades, and the notable volcanoes known as the High Cascades.
In contrast, Eastern Oregon lies in the rain shadow of the Cascades and is much drier. The climatic gradient is evident in the state's landscapes : forested mountains , glaciated peaks , shrub - and grass -covered plains , agricultural valleys , beaches , desert playas , and wetlands .
Both the WWF and the EPA divide the mountains into three ecoregions: the Sierra Nevada, [16] the Klamath Mountains, [17] and the Eastern Cascades Slopes and Foothills (occurring on the Modoc Plateau). [18] The Sierra Nevada are home to half of the vascular plant species of California, with 400 species that are endemic to the region. [16]
The standard reference is The Deciduous Forest of Eastern North America. [4] The adjoining forests in Canada are generally referred to as the Mixedwood Plains Ecozone or the Great Lakes-St.Lawrence Forest Region. 32 Texas Blackland Prairies; 33 East Central Texas Plains; 34 Western Gulf Coastal Plain; 36 Ouachita Mountains; 37 Arkansas Valley
Major road routes through eastern Oregon include I-84 from Ontario to the Columbia River Gorge. The only other interstate freeway in the region is an eleven-mile (18 km) stretch of Interstate 82 that ends at the Columbia River in Umatilla. Other major east–west routes include U.S. Route 26, U.S. Route 30, U.S. Route 20 and U.S. Route 730.
Large blocks of intact forest include North Cascades National Park in Washington and the following areas of British Columbia; Big Creek Provincial Park and Spruce Lake Protected Area, the Stein Valley Nlaka'pamux Heritage Park, E. C. Manning Provincial Park, Tsʼilʔos Provincial Park, Cathedral Provincial Park and Protected Area, Skagit Valley ...