AHC/WI: International U.S./Canadian Canal(s).

As on the label-As many know, there are two major canals in the area of New York & Ontario-the Erie Canal, and the lesser known Welland Canal in Ontario. What if, however, there was a third canal?

Let's say that, as an alternate outcome of the War of 1812, the Americans make a few small territorial concessions, including parts of northern Maine, and a certain little slice of western New York(including Grand Island). Assuming that both the Erie and Welland Canals are eventually built as IOTL, what might be the effect of a third, smaller canal(that connects to the Erie Canal) that is built on this new border between the U.S. and Canada?
 
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