sellwood bridge is allright but. . .
i would just ride the hawthorne. the Sellwood bridge is out of the way if you're coming from barbur, unless you come from LO or SW terwilliger area. the bridge sucks to ride on. you either have to ride the sidewalk which is super narrow and only on the north side of the bridge, or take the lane, and the people stuck behind bikes are NOT amicable, in fact, they make me want to carry a firearm when i ride. when i do ride it, i try my best to hold 20 mph all the way across. going westbound, its not as bad, and you can ride through the cemetary up to terwilliger and out.
i would just stay on the hawthorne bridge, and perhaps ride terwilliger by OHSU for a little variety.