You are going to have a hell-of-a time getting that tree....or should I say trees outta there with a bow saw. I looked at it the last time down and the one log/tree has attracted another and still (i think) another. You will need a chainsaw and a com-a-long or something to get one tree up above water so that you can get to it.
I would say just walk it since it really poses no hazard, yet eventually it will turn into a giant logjam.
I would help, but have a hectic schedule and do my best just to paddle the sucka.