Double black Purgatory, CO
Lower Bull Run drops 781 vertical feet over 3,146 feet of skiing, with a steepest pitch of 39° about 1,740 feet below the top. That's steeper than 66% of the 2,251 double black runs we've measured in North America, and the 3rd steepest of 90 named runs at Purgatory. It faces north.
Facing north at an average 15°, Lower Bull Run gets about 68% of the winter sun that flat ground at Purgatory does, December through March. That's shadier than 75% of the runs we've measured, and the 16th shadiest named run at Purgatory. Its top sits at 10,130 feet.
Shaded snow stays colder and drier, so it holds powder longer after a storm and is slower to crust over or turn to slush in spring. Shading from ridges and trees isn't counted yet.
under 25°25–35°35–45°45°+ Hover to follow the line on the map.
Measured by ZRankings from 1-meter USGS lidar. Steepest pitch is the steepest stretch of about 50 vertical feet along the skiable line. Run lines come from OpenStreetMap and can sit a little off the skied path.