It is true.
I am new in Ottawa and not have a boat, but tried to explore many locations along the Rideau River! It's really not bad especially in last two weeks! Catched many big bass - at least a 1lb bass each time (but only 3 walleyes in the whole summer)!
Fishing in the white water - near rapids is really exciting!
I went fishing on Yesterday (Monday) I did pretty well. I got 8 LM 1 SM 4 Pikes and a 40 inc Muskie follow.