If I recall correctly - Sentinel Pass by Morraine Lake is about that length and is absolutely breathtaking at the top of the switchbacks. Great place for lunch before the walk back to the parking lot.
http://hikealberta.com/hike/larch-va...nel-pass-trail
*EDIT - sorry missed the K-country bit. I'm going to leave this up though as it's a hike no one should miss.