I havent dont a whole lot of bank fishing on the OP but I can tell you from the little that I have done, the Hoh has the most and the easiest.

Just take the the road that runs along the northside of the river and head East and there are more then a couple spots that you can easily walk into.

Same thing goes the for the Queets as well. Take the road that follows the southside of the river into the National Park and you will find plenty of easy bank access.