WDFW’s PHS_OregonWhiteOak layer consists of “Oak Woodlands in Southwest Washington” polygons (within all of Clark County and small portions of Skamania and Cowlitz counties) that shows modeled, presumed locations of Oregon White Oak Woodlands, as well as older polygons mapped by WDFW Habitat and Wildlife biologists. These oak polygons are defined by WDFW’s Priority Habitats and Species (PHS) program.