The border of Wisconsin and Minnesota, where I-90 comes through, is the Mississippi River. Lock and Dam #7 (as well as all the other locks and dams on the river) were built to increase the depth of the river water to at least nine feet at those places where the river was normally shallower than that. Barges carrying grain and other stuff regularly come through here. It is still a commercial river, unlike the New York State Barge Canal/Erie Canal which is now just for recreation. And never were the locks in New York State able to accommodate the extremely long and wide rafts of barges that these locks can.
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