I am a proud Canadian as well, and I have fished the Ottawa river many times. My grandparents live on it near Dunrobin and I have caught many Bass out of it, a lot of hi 3 to low 4lb but nothing enormous. Caught a lot of Muskie too and there are some BIIIIIG ones in there.
I've fished the Big Rideau a few times and had good luck. My dad pulled a 6lb, 13oz largie from under a dock about 5 years back. It's the biggest bass he's ever caught. Definately one of my favourite lakes to fish