Zaandam New England--Casino Times?

[FreesiaE]

Hi!
Heading down from Montreal to Boston this summer via the Zaandam. I strongly suspect the casino will not be open on the St. Lawrence river, but what about the St. Lawrence Seaway?  At what point on this route does it open.  Thanks!

[*Miss G*]

The casino was open on the St. Lawrence as I distinctly remember cashing in my winnings on our last night between Quebec City and disembarkation in Montreal the following morning.  Enjoy your cruise!