The Transportation Safety Board is assessing the incident concerning the Tundra, which ran aground at 1 a.m. Sunday morning near Summerstown, Ontario.
A TSB spokesman said the Tundra has been investigated before, following another grounding incident in 2012.
In that case, the report found fatigue and ineffective communication between the pilot and bridge officers to have been contributing factors.
The causes of the current incident are under investigation.
Navigation on the St. Lawrence Seaway had resumed about nine hours earlier after being closed for 42 hours following an incident with the cruise ship Saint Laurent, which struck a lock Thursday evening.