The birds were in a cut-over area with regenerating with about 10 yr old conifers with dense underbrush (including dense poison oak). The location seems pretty far north and east of other sightings in eBird, only about 1.5 miles south of the Washington County line.
Later in the afternoon I tied in with Paul to visit a variety of productive Yamhill County spots. My thanks to Paul for sharing generously. Checklists on eBird.