Ecoregions of the Pacific Northwest Identified through the analysis and patterns of composition of biotic and abiotic factors of an area.

Ecoregions of the Pacific Northwest

Identified through the analysis and patterns of composition of biotic and abiotic factors of an area.

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1

#1 Coast Range• Highest Peak, 4000 feet Mary’s Peak• Average Height 1,500 feet• Highly productive coniferous forest• Sitka Spruce (historically dominated), Coastal Redwood• Most common trees are the big three: Western Redcedar, Western

Hemlock, Douglas-Fir (planted)

#1 Coast Range

2

#2 Puget Lowlands• Seattle - Puget Sound Estuary• Formed from a glacial trough• Glaciation occurred as recently as 15,000 years ago• Ice sheet up to 3,000 feet thick near Seattle

#2 Puget Lowlands

3

#3 Willamette Valley• Rolling prairies• Mixed forests: coniferous and broadleaves• Oregon White Oak• Great topsoil as a result of historic ice-age floods• Temperate• Highly productive soils, Fluvial Terraces, Floodplains

#3 Willamette Valley

4

#4 Cascades• Volcanic • Average height: 5,000 feet• Highest Peak: Mt. Rainier 14,411 feet• Rivers flow west• Coniferous • Steep ridges due to glaciers

#4 Cascades

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#5 Eastern Cascades Slope• Rainshadow (leeward)• Open Forest• Ponderosa, Lodgepole, Aspen

#5 Eastern Cascade Slope

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#6 Columbia Plateau• Wheat land• Arid Grassland• Result of volcanism

#6 Columbia Plateau

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#7 Blue Mountains• Wallowa Mountains• Not as high as the Rockies of Cascades• Average height: 4,000 feet• Volcanic in origin• Cattle grazing• Sagebrush, Pine, Aspen

#7 Blue Mountains

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#8 North Basin and Range• Steens Mountains –Uplift• Cattle and sheep grazing• Arid • Sagebrush

#8 North Basin and Range

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#9 Snake River Plain• Agricultural Land• River used for irrigation• Sagebrush in areas not irrigated

#9 Snake River Plain

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#10 Rocky Mountains• 14,400 highest peak• Average height: 7,000• Uplift• Span from Canada to Mexico

#10 Rocky Mountains

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#11 Klamath Mountains• Uplift• Siskiyou Mountains• Runs into California

#11 Klamath Mountains