Polly Hanson was famous for warning us that the seas will rise. Klayton Curtis has commented on this blog that the Rez could become an island.
If you are inclined to see how this would actually look you can buy and use an inexpensive application (for PCs only at this point) to depict how a flood would affect the island and our transportation networks. You can create depictions of a number of scenarios for a variety of disasters and events.
The following video (narration by islanders Isaac and Bremhyr Colgan) explains how it works.
(Full disclosure. We have invested in this company).