Have never fished the Bow yet but what I have experienced goes for all rivers fished by me up until now. I swing streamers on evry type of water. Slow and deep flowing pools, runs, riffles just as long as it has enough current to move your flies. Most of the time I use a clear intermediate (very very slow sinking) polyleader and an unweighted streamer pattern with lots of movement in it. Big softhackles are good as well. As long as the water is less than 5 feet deep fish will often come up all the way to the surface to take your fly. Only when the action is very slow I will start using weighted flies and sink leaders.
My friend Ducthdryfly started tossing speyflies for trout and grayling about 2 years ago and they work fine. Gonna try something like this on the Bow in about a week...