Corkscrew follows a stream channel that cut into the Collins Gulch hanging valley after the ice had melted.  This channel represents about 6,000 years of stream erosion.  Alta has widened the run somewhat to accommodate more skier traffic.  Corkscrew Gulley is the same stream channel cutting through gentle terrain at the bottom of the Collins Gulch U-shaped valley.  It forms a spectacular natural half pipe when there is adequate snow.

Corkscrew is partly in shadow at the left side of the photo.

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