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Oregon's Forest Atlas 2010 online edition
Oregon Forestland: Dominant Tree Species
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Understanding the tree species composition of Oregon’s forests is an important factor in assessing biological diversity, resiliency, and economic value of forested ecosystems. Unlike tropical forests, Oregon is fortunate that all of its dominant forest tree species have commercial value. Changes in native tree species due to non-native species invasion, climate change, forestland conversion, and land management are all scientific and policy concerns.
Oregon’s forest vegetation is constantly changing as a result of vegetation growth and death, and natural disturbances such and insects and disease, fire, windstorms, floods, volcanic eruptions, and climate change. Human alteration of Oregon’s forest predates European settlement, but has increased significantly over the past 150+ years of Oregon statehood. The tree species composition of forests can serve as indicators of changes to ecosystems, and as indicators of the status of other organisms and ecosystem processes that are difficult to measure directly.
Data description for this map series 

Map for download and viewing
Map showing dominant trees species thoughout Oregon
This map depicts Oregon’s forest coverage – 30,472,000 acres – explaining the dominant tree species in each region of the state. This map uses data from the U.S. Forest Service PNW Research Station in Corvallis, the Oregon Institute for Natural Resources at Oregon State University and the Oregon Department of Forestry.
JPG version of the map - ( 2.5 Mb file)

Ecological Systems Habitat types by dominant forest species in Oregon
Bigleaf Maple / Alder 
Larch / Grand Fir 
Lodgepole Pine 
Madrone / Tanoak 
Mountain Hemlock / Silver Fir 
Oregon White Oak 
Ponderosa Pine 
Shasta Red Fir / White Fir 
Western Hemlock 
Western Juniper 

Detail zoom-in of Three Sisters region in central Oregon
central Oregon region
A 'map zoom' provides additional detail of data for the Three Sisters area of the Cascade Mountain range.

Maps of the zoom area
JPG version of the map - ( 3.4 Mb file)

Important information about Forest Atlas map products
Data for the Forest Atlas was compiled by staff with the Oregon Department of Forestry in 2010 using data generated by the U.S. Forest Service PNW Research Station in Corvallis, Oregon State University and the Oregon Department of Forestry.
This product is for informational purposes, and may not be suitable for legal, engineering or surveying purposes. This information or data is provided with the understanding that conclusions drawn from such information are the responsibility of the user.

Data contained within the map products does not necessarily reflect conditions at a fine-detail level.  Some data models rely on site information at least one year old. All information published herein is gathered from sources which are thought to be reliable, but the reader should not assume that the information is official or final, especially for the purposes of land use determination. The Oregon Department of Forestry does not assume responsibility for errors, and all research information contained within the website is subject to change without notice.
Additional information is contained in the liability notice 

Oregon's Forest Atlas main page 
2010 Forest Assessment and Resource Strategy project information 
Additional questions about Oregon's Forest Atlas 2010 can be addressed by the Oregon Department of Forestry's Agency Affairs Office.