old weir/dam

A small weir/dam might provide some play at some optimum water levels, but far more times may dish out danger. While never all that much of a drop, the boil line may trap those who do not successfully land a 'boof', keep perpendicular to the current, and paddle out of the boil.
Be prepared to scout and possibly portage. Very strongly advised not to run this unless you have enough people in your group who have throw ropes and experience in swift-water rescue techniques. Extracting a boater (or their boat, recirculating in the boil at the dam) requires equipment (throw ropes), knowledge, and skills to ensure not giving the river another victim!