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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 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.
The High Southern Cascades Montane Forest ecoregion is an undulating, glaciated, volcanic plateau punctuated by isolated buttes and cones. Many tarns occur. With an elevation that varies from 4,000 to 8,200 feet (1,200 to 2,500 m), it is an intermediate zone between the Southern Cascades and the Subalpine/Alpine zone.
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 .
The West Cascades period came to an end 17 million years ago when the Columbia River flood basalts began erupting in eastern Washington and Oregon. [2] For a reason unknown to scientists the initiation of the flood basalts seemingly caused a significant dip in volcanic activity in the cascade chain lasting for over 8 million years. [2]
Location in Oregon relative to other major volcanoes. The major landmark for the Rogue River Valley, [4] Mount McLoughlin reaches an elevation of 9,493 feet (2,893 m). [1] The tallest volcano in between Mount Shasta — located 70 miles (110 km) to the south [5] — and South Sister 120 miles (190 km) to the north, it lies in the Cascade Range, in the southern portion of the U.S. state of ...
The present east portal is nearly four miles (6.5 km) east of the original and is at 2,881 feet (878 m) above sea level, 1,180 feet (360 m) below the pass. The tunnel connects Berne in Chelan County on its east with Scenic Hot Springs in King County on its west and is the longest railroad tunnel in the United States.
Wildlife of the mountains includes bighorn sheep (Ovis canadensis), mountain goat (Oreamnos americanus), grizzly bear (Ursus arctos) and black bear (Ursus americanus), black-tailed deer (Odocoileus hemionus), coyote (Canis latrans) and cougar (Puma concolor couguar) [2] with smaller mammals such as the northern flying squirrel.