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The Northface Catwalk takes you from the bottom of the Northwoods Express Lift #11 across to the bottom part of Prima and on to the bottom part of Riva Ridge.
This is a green cat track type of traverse although it is green for the first part, it is blue for the second part.
This is because the first part has an option of Skid Road for the beginner or apprehensive skier, which is a green, but if you continue on you will hit the bottom of Riva Ridge, whose last pitch is a blue.
Also, this a alternative way of getting to the bottom of Vail Village or Lionshead for lunch or at the end of the day to avoid going back up to the more crowded top.