Black diamond Sun Valley, ID
Arnold's Run drops 470 vertical feet over 1,111 feet of skiing, with a steepest pitch of 30° about 330 feet below the top. That's steeper than 60% of the 4,740 black diamond runs we've measured in North America, and the 28th steepest of 99 named runs at Sun Valley. It faces northwest.
Facing northwest at an average 25°, Arnold's Run gets about 52% of the winter sun that flat ground at Sun Valley does, December through March. That's shadier than 92% of the runs we've measured, and the 29th shadiest named run at Sun Valley. Its top sits at 7,260 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.