I did it in a 16' driftboat. We put in up the Grande Rhonde River road and floated to Bogans. We were not smallmouth fishing but I did catch a 4 pounder inadvertently. We did it in August I think and the water got skinny in a few places. We ended up walking the boat in a few places. I would do it in my pontoon without thinking twice about it. If you're experienced on the sticks, you shouldn't have any issues. Bring a rope, you can always line it through if you're feeling sketchy about a run.
There is some great smallmouth fishing in there for sure.