Blue Sun Valley, ID
I-80 drops 757 vertical feet over 5,160 feet of skiing, with a steepest pitch of 16° about 5,080 feet below the top. That's steeper than 16% of the 5,615 blue runs we've measured in North America, and the 93rd steepest of 99 named runs at Sun Valley. It faces north.
Facing north at an average 9°, I-80 gets about 63% of the winter sun that flat ground at Sun Valley does, December through March. That's shadier than 81% of the runs we've measured, and the 52nd shadiest named run at Sun Valley. Its top sits at 9,030 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.