Yeah I saw the pics. That's gonna make it incredibly difficult to perform rescue operations and move clean up crews on and off the island.
About 20 years ago the causeway between the Texas mainland at Port Isabel, and the barrier island of South Padre, had about an 80-foot section collapse after the support pilings and columns were struck by an errant string of barges. It, too, was the only connection between the mainland and the barrier island, and for two months they had to use makeshift ferries to get cars and supplies across to the island. I'm honestly surprised they were able to rebuild it in two months, but people get highly motivated when their sole source of electricity, fresh water, and transportation is completely severed.