I would put a 330 just out from the bank on each side. Using dead wood for stakes I would form a fence with dead brush the rest of the way across the stream.
If there are many of the 2 foot wide spots I would just concentrate of those spots. If these spots are fairly deep just find a dead pole that will fit thru that trap springs and put it across the creek so the pole is right at water level. The beaver will dive under the pole and right into the trap. You will need to find a way to stabilize the pole so that it doesn't swing back and forth.
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