Planning and timing
Ken, I have sailed the lower St-Lawrence river as well as the portion from Montreal to Lake Ontario many times over the last 25 years. Yes the lower St-Lawrence can be gruesome and it will make you work, but it will reward you with exhilarating sailing and scenery. With careful timing and planning, working with the tide from the ocean to about 40 miles west of Quebec City one can cover much more than the 20 miles your calculations show. Thousand Island area is indeed a paradise (the Indians used to call it Garden of the gods), and except for a few areas, you should average 50 miles per 10 hour day from Montreal to there. You might even get lucky and get an easterly, allowing you to sail or (motor-sail) up river and still cover some ground.I am leaving next week (one more week at the salt mine !!) for a 3-week trip from Montreal up the St-Lawrence into Lake Ontario.If you have the time, I'd say do it and you will not regret it. Like J. Hrab, I can help or put you in touch with people who can. And depending when you'd do that trip, I might even volonteer as crew. Good LuckClaude