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Due to the fact that wolves require an adequate prey base of deer and elk and that winter months are likely to be the most difficult for wolf survival, the Gifford Pinchot National Forest's 1997 deer and elk biological winter range habitat data layer was used as a proxy for priority wolf habitat. Non-major roads that intersected with deer and elk biological winter range were prioritized for removal or winter closure in this data set.
This map is a reinterpretation of a more extensive set of polygons demonstrating estimated original (pre 1850) vegetation types for the Willamette Valley. Vegetation type classifications were simplified and recombined for ease of comparison with currently used classifications: i.e. Shrubland, willow swamp was joined with other wetland types, though areas with that original designation can still be found using the "Information" function in ArcMap. The vegetation polygons can be laid over a basemap of current road system for use in comparing original vegetation with current vegetation status, and for locating extant remnants of original plant communities. I believe that the information contained within these...
This data set combines USGS Hydrologic Units (Subbasins = 5th field HUC) with the Protected Areas Database maintained by the Conservation Biology Institute (http://consbio.org/what-we-do/protected-areas-database-pad-version-4/)