[Bring_Back_Shantz]

Originally Posted by Fuzz

Pretty sure the existence of locks makes it not tidewater. It's also a pretty big impediment to oil and gas shipping considering the size restrictions, distance and time to get through. I don't think I'm behind any export plans using the seaway.

Okay, so there are no tidewater ports, just ports that have access to tidewater.

Does it matter if there is a distinction in name only?

https://tc.canada.ca/en/marine-trans...-safety-canada

From that site:
Tankers carrying oil products account for 7 percent of all shipments completed in the Great Lakes – St. Lawrence Seaway. Heavy crude oil is not currently transported on the Great Lakes – St. Lawrence Seaway.

Refined product is already moving through the St. Lawrence.
Could crude happen? Probably.
Is it ideal? No, but it's an option that is better than nothing.