Having done a fair amount of clearing around small ponds and streams, my opinion is that even a 10 1/2' backhoe on a TN75 isn't large enough if you venture beyond the very edge. In my case it gets muddy very quickly and the tractor tends to get very tippy. I also have to move the machine almost constantly. I do it with my tractor, it just takes a lot of patience. When I need to do a bunch of it, I usually rent a small (12,000#) excavator for the job. With the ability to move and dig, the job is much safer, and goes many times more quickly. Also as far as dragging something up the banks, at least on my ponds, there are just too many rocks right at the surface for any scrapping type of equipment to work. all that happens is that the weeds get knocked over and a few weeks later they are right back.
Andy