Lowrance, through CMaps, has some very good mapping that you can access for free. Go to
www.genesismaps.com and click on the "Social Maps" tab. You'll have to search around for Canada, and then Alberta, and then by the name of the lake.
You need a Lowrance sonar to download the map and use it live in your sonar unit, but you'll be able to find your favourite lakes and view them online. You can can pan around and zoom in to the areas you want and then take a screen capture and print it. The shoreline shows up as an air photo, which should help you get oriented between the bathymetry contours and where you are on the lake.
It's definitely worth a look!