Interstate 15 in Arizona From Wikipedia, the free encyclopedia Jump to navigationJump to search This article is about the section of highway in Arizona. For the entire length of highway, see Interstate 15. Interstate 15 marker Interstate 15 Veterans Memorial Highway Wikimedia | © OpenStreetMap I-15 highlighted in red Route information Maintained by ADOT Length 29.43 mi[2] (47.36 km) Existed 1962[1]–present Major junctions South end I‑15 near Mesquite, NV North end I-15 near St. George, UT Location Counties Mohave 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.
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