Double black (extreme) Big Sky, MT
4th Gully drops 655 vertical feet over 994 feet of skiing, with a steepest pitch of 48° about 400 feet below the top. That's steeper than 95% of the 2,251 double black runs we've measured in North America, and the 11th steepest of 290 named runs at Big Sky. It faces northeast.
Facing northeast at an average 42°, 4th Gully gets about 66% of the winter sun that flat ground at Big Sky does, December through March. That's shadier than 77% of the runs we've measured, and the 58th shadiest named run at Big Sky. Its top sits at 10,370 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.