18      US HIGHWAY 191 – formerly known as US 666

            (between Clifton and Alpine, AZ)

            From 5 miles south of Hannagan Meadow to the north side of Morenci is prohibited to trucks over 40' in length.  There is also a tunnel just north of Morenci with a 12' 7" vertical clearance.  This road is not suitable for large vehicles from Morenci to just south of Hannagan Meadow.  The grades can be as steep as 8 or 9% but they are usually short.  The road is extremely narrow in many places with an incredible number of 10 and 15 mph hairpin turns, not to mention many 20 and 25 mph curves.  The first 20 miles north of Morenci takes over an hour in a car.

            About 6½ miles south of Hannagan Meadow there is a steady 6% southbound descent for about 5 miles with 20 mph curves.  There is a short 6% descent from Morenci to Clifton and a 2 mile 6% climb out of Clifton going south.