i forget the road names but
from the ferry go into wilsonville. you can do it relatively easily and end up at the north wilsonville exit. cross I5 to the west, then take wilsonville Rd. north into the mess of tualitin sherwood Rd. this route is less hilly than on the east side of the interstate. i ride on it with my team during the winter a lot.
i strongly caution against riding the road between wilsonville and newberg on the north side of the river. people drive way too fast for comfort on the windy road.