Pacific Grade between Mosquito Lake and Hemit Valley on Hwy. 2.5 miles, 1100', grade averages 8% and tops out at 22%. Did I mention the 7000-8000' elevation?
It starts in Nevada, but the east side of Mt Rose. 15 miles and 4100' of climbing. Most of it is only 5-7%, but there is no let up until you hit the last couple of miles in double digit grades.