Interstate 15 in Arizona

Interstate 15
Veterans Memorial Highway
I-15 highlighted in red
Route information
Maintained by ADOT
Length	29.43 mi[1] (47.36 km)
Existed	1962 (1962)[2]–present
NHS	Entire route
Major junctions
South end	I-15 near Mesquite, NV
North end	I-15 near St. George, UT
Location
Country	United States
State	Arizona
County	Mohave
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future Arizona State Highway System Interstate US State Proposed 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.