Well, Saskatoon is in the process of building a whitewater park. Im sure you can find someting on Google but if not I can email you some details.
There is also the Deifenbacker / Coteau Damn outflow. Check on Playak.net for that one. Ive been twice and its been pretty meaty both times. Not fun meaty but hold-on tight meaty. Ive sene pics when it looks wicked though.