https://geoscan.nrcan.gc.ca/geoscan-index.htmlThe geoscan index maintained by Natural Resources Canada contains a wealth of historical information about available maps and technical reports (Geological Survey of Canada) produced when the areas you are interested in were originally explored in the late 1800 and early 1900s. Before the internet, many of these publications were distributed to major university libraries across North America, and now much of this information is available for download through the geoscan index – in case you don't have ready access to a large university library where copies might be available.
I was part of a group that explored the Eastmain River area years ago. We found that A. P. Low's reports and maps contained amazingly accurate and detailed canoe route information, since before the advent of travel by air, travel by canoe was the only way people could traverse the North.
I would suggest using the advanced search feature at the link above. You can narrow down the search by several different criteria to get the most useful results. Anything produced after 1950 probably won't offer much information in terms of canoe routes, but maps and reports produced before that time might provide a motherlode of information. Good luck!