Black diamond Sun Valley, ID
Upper River Run drops 909 vertical feet over 2,066 feet of skiing, with a steepest pitch of 33° about 730 feet below the top. That's steeper than 74% of the 4,740 black diamond runs we've measured in North America, and the 11th steepest of 99 named runs at Sun Valley. It faces east.
Facing east at an average 26°, Upper River Run gets about 77% of the winter sun that flat ground at Sun Valley does, December through March. That's shadier than 60% of the runs we've measured, and the 65th shadiest named run at Sun Valley. Its top sits at 8,850 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.