Using your boat propeller works well. I got a little too aggressive with the throttle and it picked up a rock that was in front of the boat propeller and the rock hit the prop on the way by. $$$$. Maybe 3500 RPM's was a but much!
New plan. If you have a circulator or "ice eater" you can anchor it on it's side and move it around as needed. I bolted mine to a 2 X 4 and I can clamp the 2 X 4 to different dock posts at different angles as needed.
If you want to move debris into the water flow you can use a pressure washer with an extension on the wand.
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