page_title: Interstate 15 in Arizona
section_title: History
hierarchical_section_title: Interstate 15 in Arizona / History
caption_attribution_description: English: I-15 at the Cedar Pocket TI, looking SW from the overpass - picture taken 30 Aug 2001 14:50 MST
context_page_description: Interstate 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, 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, 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.
context_section_description: The Old Spanish Trail from Southern California had two routes through northwestern Arizona, splitting at Littlefield; one went north towards central Utah, and the other went northeast through the Virgin River Gorge, straddling the state line to the Four Corners area. When the Arrowhead Trail was marked in the 1920s, and U.S. Route 91 in 1926, automobile travelers between Nevada and Utah followed the northerly routing, turning east in Utah to reach St. George.
  When the Interstates were planned, federal authorities decided to save 12 miles (19 km) over US 91 and pass through the Virgin River Gorge to take advantage of its scenery and lower grades for trucks.  Construction was completed first, in the early 1960s, on the portion between Nevada and the gorge.  The bridges over Big Bend Wash were completed in 1962.  The bridge over the Virgin River near Littlefield was completed by 1964.  By 1965, the overpass over Black Rock Road (northwards) was finally complete.
  Construction through the gorge was slower and much more difficult, and the segment could not fully open until December 14, 1973.  To help quicken construction, the state of Utah loaned a portion of their federal highway funds to Arizona. Even though the highway is of little importance to the transportation needs of Arizona, as it does not link any Arizona communities, it does serve as a vital link between Salt Lake City and Las Vegas and Los Angeles to the southwest. Despite extra funding, however, challenges remained. Flash flooding and quicksand in the gorge repeatedly caused problems, with equipment and materials apparently disappearing overnight. Worse, the project was to claim a life, when in October 1969, a helicopter performing reconnaissance on the gorge crashed due to wind, killing the pilot. To help navigate the gorge's rugged and unforgiving terrain, a special piece of equipment called a swamp buggy had to be brought from Texas. Even with this help, the route still demanded construction of four bridges over Virgin River. The westernmost bridge and the bridge carrying the northbound lanes at the third bridge location from the west were completed in 1972. By 1973, all five bridges were finally complete.
  Even before its opening, it was promoted as the most scenic highway in the state; a 1988 article in Arizona Highways said that the project "enhanced rather than distracted from Nature's handiwork". The Virgin River was rechanneled 12 times in what was the most expensive rural freeway in the country, at the price of approximately $10 million per mile ($6,200,000/km) or $49 million per mile ($30,000,000/km) in 2007 dollars.
caption: I-15 at exit 18
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