The Spray Lakes Reservoir is located just south and west of Canmore as you climb up towards the Nordic Centre. It is located on the same road and very close to Quarry Pond. The first access point is just past the dam itself on the south side of the road.
There is a small beach and the carry is less than 50 feet. The lake extends back into the mountains for quite a distance. For much of that, the reservoir is narrow.
There is quite a lot of wild life to be seen here. And the picture below was shot from the parking lot of the Canmore Nordic Centre (which has a cafeteria, washrooms, and an equipment rental centre).
This might be a good paddle to combine with a morning or afternoon at Quarry Lake.