Sonora Pass elevation profile can be found here: http://www.geocities.com/banquo_lives/sonora/ I know the signs approaching the pass say there is a 26% grade but it must be a very short segment. The sign on the West side indicates it will be a descent. The sign on the East side indicates an ascent so the 26% part must be on the East side and there are a couple steep hairpin turns on the East side. I have plotted the grade as the average for 6 minute intervals. Since I was climbing about 2200 ft/hr, this would be the average grade for about every 220 feet of climb.