Mclean Pond or Allen Bill pond west of Bragg Creek are both stocked with small rainbows, I have seen guys with pontoons at Mclean (Allen Bill is tiny). I have had days of 10+ fish per hour out of Mclean, with the biggest being around the 15" mark. If you are in North Calgary a good spot would also be Sibbald lake/ Sibbald Meadows Pond. Or try this link to the fish stocking report and have a look for yourself:
http://mywildalberta.com/Fishing/StockingReports.aspx