After failed attempts at Burnt Hill [W7W/NO-108] and Display Mountain [W7W/SO-105], I drove down Donkey Creek Road east of Highway 101 to a spot where the satellite views from Google Maps and AllTrails.com show a road splitting off to the east [47.303033, -123.834128].  

I parked here and passed a gate -- no 'no tresspassing signs' or other indications I was on private land (see photo).