Drive 4.5km west of the Stoney Trail bridge in Calgary on Hwy#1 and take the exit at the Old Banff Coach Road overpass and turn north. Then in about .5km turn left at the T-intersection with Township Road and 250m further turn right onto Calling Horse Drive. Pull off and park in the ditch about 100m up the steep hill where there is a break in the fence allowing access to the grassy hillsides to the east. Parking is rather hard for some vehicles as the ditch is lipped.Walk across the hillsides above the creek toward the NE.
Find the overlook to the Bearspaw Reservoir under some powerlines and descend a track toward the creek. Cut back right to the rock(20 minutes).You can also drop into the drainage a bit earlier, swampy bushes, or split the difference and sidehill between the two routes. There are many paths since its a popular walking area.You will find the climbing on heavily eroded sandstone outcrops that face generally east. These run intermittently for several hundred metres back upstream(south) from where the path drops around the north end of the reservoir. This is info from about 2001 so it being Calgary and all, maybe this is completely impossible approach now. Let us know with an update.