Remember, heavy-lift choppers are still making their way to the area. Right now, they're scarce. The lighter Jetranger types cannot lift much (700lbs, at best over the two person crew, if I recall correctly), and the Coast Guard HH-60s and HH-65s are not rigged to carry loads.
Most of those hulls have run aground and cannot be refloated to be moved without a lot more time than they have.
"Most of those hulls have run aground and cannot be refloated to be moved without a lot more time than they have. "
Citizens have to get anything that runs to the lake to tow hulls into the breech area.
When they pass the breech, they will snag and after a few hundred of these, the flow will be drestically reduced as smaller flotsam fills up the nooks and crannies.