<P> Interstate 40 (I - 40) is an east--west Interstate Highway that has a 359.11 - mile (577.93 km) section in the U.S. state of Arizona connecting sections in California to New Mexico . It enters Arizona from the west at a crossing of the Colorado River southwest of Kingman . It travels eastward across the northern portion of the state connecting the cities of Kingman, Ash Fork, Williams, Flagstaff, Winslow, and Holbrook . I - 40 continues into New Mexico, heading to Albuquerque . The highway has major junctions with U.S. Route 93 (US 93) in Kingman, the main highway connecting Phoenix and Las Vegas, Nevada, and I - 17 in Flagstaff, the Interstate linking Phoenix and Flagstaff . </P> <P> For the majority of its routing through Arizona, I - 40 follows the historic alignment of U.S. Route 66 . The lone exception is a stretch between Kingman and Ash Fork where US 66 took a more northerly, less direct route that is now State Route 66 . Construction of I - 40 was ongoing in the 1960s and 1970s and reached completion in 1984 . With the completion of I - 40 in 1984, the entire routing of US 66 had been bypassed by Interstate Highways which led to its decertification a year later in 1985 . </P> <P> I - 40 enters Arizona from California at a bridge that crosses the Colorado River at Topock in Mohave County . It heads east from Topock and begins to curve towards the north at Franconia and completes the curve to the north at Yucca . The interstate continues to head north until it reaches Kingman . In this city, I - 40 has a junction with US 93 at exit 48 . US 93 heads towards the northwest from this junction to Hoover Dam and Las Vegas . US 93 south begins to run concurrently with I - 40 as they both head east through Kingman . The two separate at exit 71 as US 93 heads towards the south towards Phoenix while I - 40 heads east towards Flagstaff . I - 40 continues towards the east, passing through the town of Seligman and then at Ash Fork, where it meets State Route 89, the main highway that heads south to Prescott . Next, it passes through Williams at exit 165 with SR 64, and heads north towards Grand Canyon National Park . I - 40 continues to the east to Flagstaff, where it has a junction with I - 17 at exit 195 . I - 17 heads south from the interchange with I - 40 to Phoenix . </P> <P> East of Flagstaff, I - 40 heads towards the east - southeast direction as it goes through the town of Winslow . It continues towards this direction until it reaches Holbrook, where it curves towards the northeast . Along this stretch, it passes through Petrified Forest National Park and continues to the northeast, passing through Chambers, and enters the Navajo Indian Reservation . The highway still continues to the northeast to the New Mexico border southwest of Gallup, New Mexico as it continues on towards Albuquerque . </P>

Miles from flagstaff arizona to albuquerque new mexico