"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.
How, exactly, do you propose that they tow a multiton hull stuck fast in a mud flat with runabouts???
Geez, they have problems doing that with purpose-built tugs with thousands of horsepower.