You may find some useful information at
http://www.myccr.com/phpbbforum/viewtop ... 13&t=42341 The Bigstone was used in the fur-trade days, I believe, as a means to miss the heavy water on the Nelson and so access the bay from Lake Winnipeg.
I recall something about it in Eric Morse's "Fur trade Routes ...".
Part of the Middle Track?
_________________
A literal mind is a little mind. If it's not worth doing to excess, it's not worth doing at all. Good enough isn't. None are so blind as those who choose not to see. (AJ)