Was reading about the Timberline Ski Area, courtesy of Denis posting links, and found their definition of how to determine the type of slope you are about to ski. I hope you all can make sense of this, since it did not copy exactly. Quite interesting, especially when one considers the discussions on DCSki about slope steepness, etc. The actual web site:
http://en.wikipedia.org/wiki/Timberline_Lodge_ski_area#VerticalThe Colonel
Terrain
Timberline categorizes the terrain as beginner 20%, intermediate 50%, advanced 30%. However, the Forest Service published an environmental impact statement containing more detailed information:
Terrain categorization by area and comfortable guest usage
based on industry standard terrain density Full ski area (Winter) Upper mountain closed
(40% of Winter days)
Terrain type Terrain definition
slope gradient Acres Rider
capacity Capacity
distribution Acres Rider
capacity Capacity
distribution
Beginner 8% to 12% 1.4 acres (5,700 m2) 42.6 1% 1.4 acres (5,700 m2) 42.6 3%
Novice to 25% (30% short pitches) 37.6 677.2 14% 37.6 677.2 48%
Low Intermediate to 30% (35% short pitches) 136.8 1,914.8 40% 23.6 329.8 23%
Intermediate to 40% (45% short pitches) 55.5 555.3 12% 19.0 189.7 13%
Advanced Intermediate to 50% (55% short pitches) 223.5 1,564.4 33% 24.1 168.6 12%
Expert over 50% 1.3 3.9 0% 1.3 3.9 0%
Total 456.1 4,758.2 100% 106.9 1,411.8 100%