Joel,

Not sure if you have done this yet but I would suggest you take a boat out and see how many cribs are still intact. Given the iceflows on the St L I would caution you to consider design alternatives. I have seen many a fine crib pushed away by an ice flow come spring! Most of the newer docks on the St L are attached to shore with some aspect of floatation, though would not apply to your boar house.

Bruce,