Double black Crystal Mountain, WA
I-405 drops 175 vertical feet over 1,446 feet of skiing, with a steepest pitch of 37° about 10 feet below the top. That's steeper than 55% of the 2,251 double black runs we've measured in North America, and the 55th steepest of 133 named runs at Crystal Mountain. It faces east.
Facing east at an average 9°, I-405 gets about 102% of the winter sun that flat ground at Crystal Mountain does, December through March. That's sunnier than 74% of the runs we've measured, and the 57th sunniest named run at Crystal Mountain. Its top sits at 5,370 feet.
With little slope to hide behind, it takes nearly the full winter sun of open ground: powder settles and turns heavy sooner after a storm, and spring snow softens early. 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.