I rigged up a 16' lake boat with 20h. merc and installed a middlebuster plow in front of the bow with sturdy braces. We have wide canal-like ditches around here; the beaver would build dams about every three hundred yards.
I'd crank up, get a full throttle running start and ram through the dams, sometimes it would take two or three 'rams' to break through but then was fun to ride the 'tidal wave' on down to the next dam. After the initial dam-breaking we would police the canal with a routine run-through every three or four days, much easier but less fun
