Dana, we canoed that section several times last year putting in at Shelly's cottages. The first 1.5 mile or so below Shelly's is IIIish. There was one section that I can remember gathered wood, but it was easily avoidable. Other then that, we never had a wood problem, but that is not to say there may not be wood in there this year. Not sure were you are putting in at, but the lower valley above the park (a 1.5 miles or so below Shelly's is class II, easier then the whitewater park, so if there is wood it should be easily avoidable.
If I remember right, you need about 275-300cfs minimum to paddle down from above the park in a canoe. I think above the park at 130 would be a bottem dragger? The park at 130 is a go.
You can scout the whole thing from the road.