Part of the original Canadian Highway 2 permanently submerged by the creation of the St. Lawrence Seaway in 1958. Map of the submerged area here: http://www.lostvillages.ca/en/html/map_of_villages.html
http://maps.google.com/maps?hl=en&t=k&q=Canada&ie=UTF8&ll=45.005214,-74.883735&spn=0.010969,0.019312&z=16