Google Earth has a streetview of Newberry and McNamee. Seems like a real nice 10 mile loop with Sauvie Island as a side tour. I saw a lot of turnouts on Newberry. Both are nicely paved.
WSBOB, let me know when you want to do this ride
http://www.mapmyride.com/routes/view/80770543
Thanks for posting the question, Lynnef. Hadn't really thought through one of these excursions until now. Looks quite reasonable for a summer event.