“We are not evacuating Rikers Island,” Mayor Michael Bloomberg said in a news conference Friday. Bloomberg annouced a host of extreme measures being taken by New York City in preparation for the arrival of Hurricane Irene, including a shutdown of the public transit system and the unprecedented mandatory evacuation of some 250,000 people from low-lying areas. But in response to a reporter’s question, the mayor stated in no uncertain terms (and with a hint of annoyance) that one group of New Yorkers on vulnerable ground will be staying put.

New York City is surrounded by small islands and barrier beaches, and a glance at the city’s evacuation map reveals all of them to be in Zone A (already under a mandatory evacuation order) or Zone B–all, that is, save one. Rikers Island, which lies in the waters between Queens and the Bronx, is not highlighted at all, meaning it is not to be evacuated under any circumstances.