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WEATHER
Canyons and Dissected Highlands
Ecoregion
on
Columbia Plateau
in
OR
,
WA
,
ID
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The Canyons and Dissected Highlands ecoregion includes the eastern Blue Mountains, the eastern Wallowas, and isolated islands of uplifted Columbia Plateau that have been cut by the Snake River at Hells Canyon. The Canyons And Dissected Highlands ecoregion is on the lee side of the mountains and is drier than the marine-influenced Mesic Forest Zone (11l) that is found at similar elevations to the west. Its closed canopy forest is dominated by Douglas-fir that can withstand the difficult growing conditions and shifting colluvial soils of steep canyon slopes. Below about 4,500 feet elevation, the Douglas-fir forest of The Canyons And Dissected Highlands ecoregion changes abruptly to the grassland of the Canyons and Dissected Uplands (11g). Human activities are limited by the steep terrain of The Canyons And Dissected Highlands ecoregion.
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