WHEATON, Minn. — The Army Corps warned that ice-fishing is not a not good idea below its White Rock Dam that drains into the Bois de Sioux River. The Corps said that minor adjustments in discharges may disturb ice thickness. The dam backs up 41-mile Lake Traverse, the southernmost body of water in the huge watershed of the mid-continent Hudson Bay.
Hudson Bay. This inland sea of the Arctic Ocean drains west-central Minnesota and parts of the Dakotas.