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If I remember correctly, Sunset Point is about the 253 mm, here is a quote of the grade from that point south into Black Canyon City. Here is the source link: http://www.dondepublishing.com/arizonaareas/area10.htmOriginally Posted by Rockee
Having not been there for years I cant remember. How long is the grade, how steep is it. Just because 99% of the trucks do 60 - 65 there, is it safe for them to do so? Not debating here just curious.
At milepost 253 there is a sign for southbound traffic—"Trucks—vehicles pulling trailers check brakes and equipment—use rest area." After coming out of the rest area there are signs stating—"winding road" and "6% grade next 5 miles."
At milepost 251 the 6% grade begins with 60 mph curves. After 2½ miles the grade eases for ½ mile and then goes back to 6% for 2 miles. It eases again for about ¾ mile and then is 4-5% for another mile or so to the exit for Black Canyon City.