I know that these are a bit out of your way, but for bank bass fishing I would recommend trying where the Tualatin river dumps into the Willamette in West Linn or in the Tualatin itself (at any of its parks).
I have not done it myself, but I have read about folks having good success on the East bank of the Willamette in downtown. I seem to recall folks mentioning the area around OMSI and around the esplanade. This would likely be an early morning bite around any rocky structure you can hit. Also, I have read about folks having good luck shore fishing at Elk Rock island. With the river as low as it is right now you should be able to get out to it. In high water it is a boat only location. Best of luck.