Click on the thumbnails below for a preview of the maps. Click on the map citations to download the maps. These are ZIPped (compressed) GIS shapefiles. You will need to uncompress the files and use shapefile-viewing software to view and use the data. There are free spatial tools available from ESRI.

DISCLAIMER FOR GLO VEGETATION MAPS

  Maps of historical vegetation derived from GLO survey notes are for planning and research purposes only. They are only estimates of the occurrence, location, and extent of vegetation types and wetlands as recorded at the time of survey. They do not necessarily include all landscape features that may have been present historically, and the features may not be mapped in their correct historical locations or configurations. The maps should not be used as a substitute for current wetland determinations or delineations performed by a qualified wetland specialist. As a general rule, small landscape features and those that occurred in the interiors of sections usually are under-represented and consequently have artificially low acreages. Per current Federal and Oregon Wetland Mapping Standards, the mapping of historical wetlands is "neither designed, nor intended, to support legal, regulatory, or jurisdictional analyses of wetland mapping products, nor does it attempt to differentiate between regulatory and non-regulatory wetlands." Mapping of historical wetlands is also not intended to be a hydrography dataset, and it should not be used to infer hydrologic connectivity, or lack thereof, between wetland polygons.

Eastern Columbia Gorge, Eastern Slope Mount Hood Christy, J.A. 2009. GLO historical vegetation of eastern Columbia River Gorge and east slope of Mount Hood, Oregon, 1859-1939. ArcMap shapefile, Version 2009_02. Oregon Natural Heritage Information Center, Oregon State University.
Oregon Coast Hawes, S.M., J.A. Hiebler, E.M. Nielsen, C.W. Alton, J. A. Christy, P. Benner. 2008. Historical vegetation of the Pacific Coast, Oregon, 1855-1910. ArcMap shapefile, Version 2008_03. Oregon Natural Heritage Information Center, Oregon State University.
Klamath Basin Christy, J.A. 2006. Historical vegetation of Williamson River delta and southern Klamath Basin, Oregon, 1858-1898. ArcMap shapefile, Version 2.0. Oregon Natural Heritage Information Center, Oregon State University.
Rogue Valley, Lower Applegate, Upper Illinois Valley Hickman, E. & J.A. Christy. 2009. GLO historical vegetation of central Rogue, lower Applegate, and upper Illinois Valleys, Oregon, 1854-1919. ArcMap shapefile, Version 2009_05. Oregon Natural Heritage Information Center, Oregon State University.
Sycan Marsh (Lake and Klamath Counties) Christy, J.A., M.P. Dougherty & S.C. Kolar. 2005. Historical vegetation of Sycan Marsh, Oregon, 1865-1898. ArcMap shapefile, Version 2.0. Oregon Natural Heritage Information Center, Oregon State University.
Umpqua Valley Christy, J.A & Hawes, S.M. 2003. Historical vegetation of the Umpqua Valley, Oregon, 1851-1917. ArcMap shapefile, Version 2.0. Oregon Natural Heritage Information Center, Oregon State University.
Willamette Valley Christy, J.A., E.R. Alverson, M.P. Dougherty, S.C. Kolar, C.W. Alton, S.M. Hawes, L. Ashkenas & P. Minear. 2009. GLO historical vegetation of the Willamette Valley, Oregon, 1851-1910. ArcMap shapefile, Version 2009_07. Oregon Natural Heritage Information Center, Oregon State University.

Mapping Methods and Vegetation Classification

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