I assume you're not wading, so I'll leave out the lecture of wading too close to the dam. ;D
That pool you fished is a good spot to fish. But you gotta use the current to your advantage. Don't fish the standing pool water as much as the part with current. The fish, especially whiteys, like to sit in the deep part of that pool where it's connected to the river. Definitely try some buzz bombs in the pool area. Waynechristie is also correct, trying those spots is a good idea. Infact, that spot in bowness park he is talking about is where my friend caught his first fish a few years ago, a 20" brown.
Also, that pool is a good area to sight fish. Over the years I've seen big pike in there, and lots of trout cruising around feeding near the big bouldery area, even whitefish and a few burbot. I actually grabbed a burbot there once in the shallows, but of course it got away.
Don't hesitate to try right at the drowning pool infront of the dam. There's a big ledge with boulders you can sit on.