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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 .
This roughly follows Beckey's geologic division in Cascade Alpine Guide [3] and the definition used by Peakbagger.com. [4] Sometimes the southern boundary is defined by Snoqualmie Pass and the approximate route of Interstate 90. [5] Sometimes the term "North Cascades" or "northern Cascades" is used for the entire range north of the Columbia ...
The Southern Cascades ecoregion is lower in elevation and less rugged than the surrounding regions and is characterized by gently sloping mountains and broad valleys. Elevation varies from 1,400 to 5,300 feet (430 to 1,620 m). The climate is drier than other parts of the Cascades, and the vegetation reflects the long summer drought.
The high desert is named as such for its generally high elevation, averaging about 4,000 feet (1,200 m) across the region. [4] It is bordered by the eastern foothills of the Cascade Range to the west. The Blue Mountains are the geographical boundary to the north, marking the northern end of the high desert's semi-arid plateau.
In 1892, President Grover Cleveland decided to create the Cascades Forest Reserve, based on the authority of the Forest Reserve Act of 1891. [90] Cascades Reserve was a strip of land from 20 to 60 mi (30 to 100 km) wide around the main crest of the Cascade Range, stretching from the Columbia River almost to the border with California. [91]
The North Cascades include various protected areas. Chief among the areas in Washington is North Cascades National Park, occupying much of the area between Mount Baker and the Cascade divide. Contiguous with the Park are Ross Lake National Recreation Area and Lake Chelan National Recreation Area. Designated wilderness areas in the range include:
With an elevation of 7,795 feet (2,376 m) above sea level, [1] [2] Mount Washington is located in Deschutes and Linn counties in the U.S. state of Oregon. [8] It lies north of McKenzie Pass, [3] and some 12 miles (19 km) west of the city of Sisters. [9]
Adams is one of the long-lived volcanoes in the Cascade Range, with minor activity beginning 900,000 years ago and major cone building activity beginning 520,000 years ago. The whole mountain has been completely eroded by glaciers to an elevation of 8,200 feet (2,500 m) twice during its lifetime.