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ADOT marks Infrastructure Week

May 16, 2019 GMT

BULLHEAD CITY — In honor of Infrastructure Week (May 13-20), the Arizona Department of Transportation released a small sampling of the numbers behind the highway system it builds, operates and maintains.

According to ADOT, Arizona’s investment in its highway system has been $22.4 billion.

The number of highways and freeways ADOT oversees is 86, which includes portions of six interstates: I-10, I-17, I-8, I-40, I-19 and I-15.

The number of miles of state highways in Arizona is more than 6,700, according to the ADOT.

The elevation near Hannagan Meadows Along U.S. 191 is above 9,000 feet, which is the highest paved section in the state. The uppermost section of State Route 366/Swift Trail on Mount Graham in southeast Arizona is a similar elevation, but it’s near the top.


The length of I-10 across Arizona, 390 miles, is the longest continuously numbered highway in the state.

Currently, the shortest state highway is State Route 24, which is 1 mile long.

There are four tunnels on Arizona highways: Mule Pass Tunnel on U.S. 80, northwest of Bisbee; Queen Creek Tunnel, on U.S. 60 east of Superior; Rock Tunnel, on U.S. 191 north of Morenci; and the Deck Park Tunnel, on I-10 in Phoenix. According to ADOT, the latter is not strictly a tunnel, as it is a series of connected bridges.

The number of bridges in the state highway system is more than 4,800.

The length of the bridges that make up the Loop 202 Red Mountain Freeway as it crosses the Salt River in Tempe is 1 mile, making up the longest bridge span in Arizona.

The height of Mike O’Callaghan-Pat Tillman bridge above the Colorado River at the Nevada state line is 900 feet.