To learn more about portages, consult these resources:

Web sites:
Great Canadian Rivers:
http://www.greatcanadianrivers.com/

The Canadian Heritage Rivers System:
http://www.chrs.ca/Main_e.htm

The Methye Portage:
http://thecanadianencyclopedia.com/index.cfm?PgNm=TCE&Params=A1ARTA0006418

Books:
Morse, Eric W. Fur Trade Routes of Canada: Then and Now. Toronto: University of Toronto Press, 1979.