Hurricane Irene likely caused an estimated $500 million in damage to boats, according to Jim Holler, senior vice president of underwriting for BoatUS. That figure, he said, does not include damage to boating facilities, and includes all boats, whether insured or not, in all states affected by the storm. What made Irene so powerful, he said, was not the wind, but the large geographic area it affected, the rain, the flooding and the storm surge.