The Current Summary of Q. garryana on the Washington and Oregon East Cascade Slopes.
The current observation set was mapped against the Little Atlas Quercus garryana mapped range. The data set demonstrates the range is much more extensive than the mapped boundaries. Considerable oak is present in Klickitat County Washington east of Goldendale, Washington and in Wasco County Oregon in the area around Tygh Valley. The boundaries of the Omernik level III & IV EcoRegions have been found to be useful in describing the species range on the east slope. Currently, I am looking at the local soil types as an tool in identifying the local range. This is promising. In Washington the Gunn soil mappes the dominate oak woodlands. In Oregon the Skyline and Wamic soils define the occurrence of oak woodlands.