First Ship to Cross the St. Lambert Lock, April 1959 First Ship to Cross the St Lambert Lock April 1959 Source: St. Lawrence Seaway Authority. The Seaway was opened for navigation in 1959. The first ship to cross the St. Lambert Lock in April 1959 was the Frontenac, an icebreaker. Share this: Click to share on LinkedIn (Opens in new window) LinkedIn Click to share on X (Opens in new window) X Click to share on Facebook (Opens in new window) Facebook Click to share on Reddit (Opens in new window) Reddit