I don't know how likely this is, but the fluid may have frozen in the hoses from being exposed to the water. I don't know what the freezing temp of hydraulic luid is, but that's a possibility. The other possibility is that the pump itself may have frozen. The last idea is a blown fuse, although I don't know if there's a fuse for the power steering and I don't have access to the manual from work.
Chip
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