My brother, a geologist, had this to say: "When a river curves, the highest water speed and rate of erosion will be on the outside of the curve. If you study geology you can see exactly how erosion is going to likely affect an area like this. This shouldn't be a surprise. Take a flight over this area and you'll see the patterns of how the rivers eat toward the outside of a curve and create "new" land on the inside of the turn. The river is actually moving sideways over time. It's what rivers do."