FishinRod, you've given me some great options on this- yes, the soil is a sandy/clay mix, but I am having 30 truckloads of pure Southeast clay brought in specifically for the core.
My main concern is not so much the stream (great ideas, btw), but when my grader scoops dirt from the bank, the water table seems to be as high as the stream almost. When he digs, it starts to fill with water. So diverting the stream is one task, but mitigating pools of water is the other.
