The best approach road to the
Tuweep area of the Grand Canyon National Park is the east side of the
Mount Trumbull loop, which joins AZ 389 along the straight section from the
Pipe Spring National Monument and Fredonia, between mileposts 24 and 25. Much of the first 10-15 miles is quite severely graded making for a very bumpy ride but the surface improves somewhat thereafter and the route remains quite wide and level for a further 15 miles - across the wide open
Antelope Valley then down into the very upper end of
Hack Canyon, a scenic tributary of Kanab Canyon, itself a branch of the main gorge and into which a 4WD track extends for some 20 miles.
The main road begins to become more steep and winding, and the surface deteriorates slightly when approaching Mount Trumbull. The middle of the three Tuweep access roads (
Clayhole Road, from Colorado City) merges from the west, and 6 miles beyond a left turn (the Toroweap Point Road) heads due south towards the canyon, while the main track curves around the south side of Mount Trumbull back west 90 miles to Cedar City in Utah.