Hi dock neighbour
If you're around the marina on Saturday night, we might be chatting on Altera with a guy who's taken his boat (Compass Rose X) down to the Caribbean several times. He hasn't done the ICW all the way but he's done bits of it due to weather.
Once he left late and had to take the St. Lawrence to Montreal and go through Lake Champlain. Jeff did the trip from Hamilton to Montreal that year but that's not a hard part of the route. Jeff did the whole trip coming north last year (not through Montreal) and I don't recall him saying they were short of water anywhere on the Erie Canal.
Found some info on the NY canals: New York State Canal System
Looks like the limiting depth on the Erie, Oswego, and Champlain Canals is 12 or 13'.
We'll probably be heading south around the same time next year but we may not take the ICW all the way. Depends how confident we are in our sailing by then and what the weather looks like.