I really think it will have a pretty big impact on some of the ledges, and little to no impact on others. I bet some of the contours will change. I can only imagine the amount of debris that will stack up on some of the deeper ledges, especially big bends in the channells. I think there are going to be sandbars, rockpiles, and brush/stumps/trees in places that weren't there before. I bet it is a good year for someone that does skeg and lower unit repairs.