I guess there's a back story here. Anyone care to elaborate?
The planning for the final form of the ICW included the deepening/widening of Delaware and Raritan Canal so that vessels could travel ACROSS New Jersey from NYC to Bristol Penna/Trenton NJ on the Delaware River ... and thus avoiding the shifty New Jersey coast.
The final (but never completed) plans for the ICW did indeed include Boston as the northern terminus .... so that there would be maximum travel through 'protected' waters.
Boston ---> Cape Cod Canal ---> Long Island Sound ---> East River (NYC) ---> Hudson ---> Raritan & Del. Canal ----> Delaware River ---> C&D Canal , etc. etc. etc.
The Delaware & Raritan Canal shut down operation during the Great Depression, some sections are still water filled as part of the NJ state park system.
Delaware and Raritan Canal - Wikipedia, the free encyclopedia