Looks like the Richelieu is more navigable than I thought. So the Chambly canal goes in earlier.not sure a Canal would have been to Lake Champlain from the St Lawrence...which probably would translate to improvements in river course of the Richlieu R. if anything. Which leads to a trnshipment for trans-Atlantic Crossing at Trois-Rivieres or VdQ rather than Montreal.
the first RR in LC ( and the Canadas in general) though was....Longueuil to Lake Champlain, in the late 30's or Early 40's I think. this were followed of course by spurs in UC and other parts of LC linking the interior (the immediate hinterland anyway) with the St. Lawrence River for transhipment to a port of departure in Montreal or VdQ.
Ah. THanks for the info.