Go to the Burger Inn my friend, 9669 MacLeod Trail SW, Calgary - (403) 252-4840.
Fries, gravy, cheese, sauteed onions and bacon
Best poutine I have ever had anywhere, but my arteries hate me for it.
Try it at least once, you won't be sorry
EDIT: Just noticed that you are in the NW, there are some closer to you, but I don't know if the menu is the same.
http://www.google.ca/search?hl=en&q=...+calgary&meta=