Teams discovered the crack on an edge girder yesterday during an inspection underneath the bridge.
The lane was shut down during rush hour yesterday and is expected to remain closed until at least 2 p.m. today, in order to allow officials enough time to analyze the extent of the damage.
Buses, which normally have priority lanes, will be integrated with regular traffic heading towards Montreal.
Jean-Vincent Lacroix, spokesman for the Jacques Cartier and Champlain Bridges Corporation, said closing the lane is a precaution and that drivers should not be concerned.
“The Champlain Bridge is a safe bridge because we monitor it and we do a lot of safety inspections on a daily basis,” he said.
None of the girders next to the damaged one show signs of deterioration, according to a statement released by the bridge corporation.
Corrosion from road salts have been blamed in the past for the deterioration of some of the bridges' edge girders.
Lacroix said that once they have more information, officials will determine whether traffic can remain flowing during the repairs.