St. Lawrence Seaway workers issue strike notice, could walk as of midnight Saturday

Unifor says workers at the St. Lawrence Seaway Corp. are ready to strike as of midnight Saturday.

It says it has issued a 72-hour strike notice to the employer and will bargain through Thursday in an attempt to reach a deal. 

The union says a strike would effectively shut down transit through the seaway.

Negotiations began on June 19 and 20 with the help of a conciliator.