Interstate 15 in Arizona

Interstate 15
Veterans Memorial Highway
Map of Arizona with I-15 in red
Route information
Maintained by ADOT
Length:	29.43 mi (47.36 km)
Existed:	1962 (1962) – present
Major junctions
South end:	I‑15 near Mesquite, NV
North end:	I-15 near St. George, UT
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future Arizona Highways Interstate U.S. State Unconstructed Former ← I-10 I-17 →

Interstate 15 (I-15) is an Interstate Highway, running from San Diego, California, United States, to the Canada–US border, through Mohave County in northwest Arizona. Despite being isolated from the rest of Arizona, in the remote Arizona Strip, and short in length at 29.43 miles (47.36 km), it remains notable for its scenic passage through the Virgin River Gorge. The highway heads in a northeasterly direction from the Nevada border northeast of Mesquite, Nevada, to the Utah border southwest of St. George, Utah.

The south portion of I-15's route was built close to the alignment of the old U.S. Route 91 (US 91), but the northern section, through the Virgin River Gorge, was built along roadless terrain. The southern section of the highway was complete and open in the early 1960s, but the gorge section was inaccessible until 1973. When it opened, the Virgin River Gorge passage was the most expensive section of rural Interstate per mile.

The highway is signed and designated the Veterans Memorial Highway, a designation which continues into Utah. Traffic volume along the Arizona section of I-15 is approximately 23,000 vehicles per day. The highway is also a part of the CANAMEX Corridor, a trade corridor in North America linking Edmonton, Alberta in Canada and Mexico City.