The Monsters of Morgan Island (short story)

The science fiction short story The Monsters of Morgan Island by Sandra McDonald was published (at least) in the June 2009 issue of Asimov's Science Fiction, a U.S. magazine. It tells an uncertain, probably onirical account of the quarry of Morgan Island (Lake Erie, probably US), that captured "monsters" were cast into. One of the possible outcomes is the "monsters" being able to overcome their captivity and taking over the island, first, then some coastal towns or even the whole world.

These "monsters" are not clearly identified in the text, but seem to be human, not extraterrestiral alien, war prisoners. See also here.
António Martins-Tuválkin, 22 June 2009