I just looked up the area, and mapped it on
www.mapmyride.com
If you climbed "Mountain Rest Rd.", it's 2.5 miles averaging 7.5% grade. That's a pretty good climb.
My best to date is an elevation gain of 1,840' in 8.6 miles averaging only 6mph. Average is only 4.1%, but there's lots of 10%-13% to make up for the somewhat flat spots, and even a few short 16% inclines.
http://app.strava.com/activities/10369166#181954438
Not too bad for a big, fat guy, though.