Hi BH:
I have read the same thing somewhere and in another post (brought up by you actually!) That fact was challenged by Bizer (of all people....I decided not to argue with a cartographer in his field of expertise!) Whether it is true or not remains to be seen but I sure would love to find the place where I read that. What little research I have read since that time seems to back up Bizer and agree with what RG quoted from the Winni Historical Society (great web page) in the original post in this thread.
Let us know if you find that reference at the Laconia Library!
McD
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PS - I can provide two references that companies were formed to dig a canal between the Cocheco River and Alton (Merrymeeting) Bay and thus connect the lake with the ocean. Obviously neither company was successful!