Hello how may I help you? hello, what river is Montreal on? Montreal is on the St. Lawrence River. Is there a way to access the river in Montreal? Yes many people choose to take boat trips on the river. In the winter does the river completely freeze over? The river does often freeze over during the winter months. About how many Bridges are there that cars can cross to the other side? So many questions! There are four bridge crossings Can you go fishing in the river? Yes, it's legal to fish in the St. Lawrence. Alright, if I visit I'll be sure to bring my pole.