Black diamond Alta, UT
Keyhole Gulch drops 321 vertical feet over 1,417 feet of skiing, with a steepest pitch of 25° about 310 feet below the top. That's steeper than 23% of the 4,740 black diamond runs we've measured in North America, and the 93rd steepest of 117 named runs at Alta. It faces north.
Facing north at an average 14°, Keyhole Gulch gets about 69% of the winter sun that flat ground at Alta does, December through March. That's shadier than 73% of the runs we've measured, and the 29th shadiest named run at Alta. Its top sits at 10,160 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.