I-15

Current route in Arizona: St. George, UT; Littlefield, AZ; Mesquite, NV
Since: 1969
Length: 29 mi
Current route nationally: San Diego, CA to Canadian border at Sweetgrass, MT

The "forgotten" Arizona Interstate. Hardly anyone will list this one when asked what Interstates run through Arizona. It crosses a very remote area of the Arizona Strip, northwest of the Grand Canyon. I-15 is not reachable by paved road from the rest of the state. I-15 replaced US 91 as the route from Las Vegas to St. George, but took a different alignment. Instead of curving north at Littlefield, I-15 climbs through the Virgin River Gorge, winding along the canyon over the river. Some of the bridges straddling the river are over 800 feet long, and nearly touch the canyon walls on either side of the highway. It's a spectacular sight, but you have to enjoy it at 55mph, as no stopping is permitted.

A 1972 picture showing one of the bridges shortly after it was constructed. (Photo: ADOT)

Click an attraction name to visit it

I-15 EXIT LIST
EXIT	NORTHBOUND EXITS Read down	SOUTHBOUND EXITS Read up
0	Nevada State Line
0	SPEED LIMIT 75	SPEED LIMIT 75
8	Littlefield Beaver Dam	Littlefield Beaver Dam
9	Farm Rd	Farm Rd
11	SPEED LIMIT 65
12	SPEED LIMIT 55	SPEED LIMIT 75
18	Cedar Pocket	Cedar Pocket
18	Virgin River Canyon Recreation Area	Virgin River Canyon Recreation Area
23	SPEED LIMIT 75	SPEED LIMIT 55
23	SPEED LIMIT 75	CURVES MOUNTAIN GRADES NEXT 11 MILES
24		SPEED LIMIT 65
27	Black Rock Rd	Black Rock Rd
29	SPEED LIMIT 75	SPEED LIMIT 75
29	Utah State Line