Main route of the Interstate Highway System
Main • Auxiliary • Business
State routes in Arizona
Unconstructed • Former
Interstate 19 (I-19) is an intrastate Interstate Highway located entirely within the state of Arizona. I-19 runs from Nogales, roughly 1,500 feet (430 meters) from the Mexican border, to Tucson, at Interstate 10. Having a total length of just over 63 miles, I-19 is the second shortest primary (two digit) interstate in the contiguous 48 States, where only Interstate 97 is shorter.
While the highway is short, it is a very important corridor, serving as a fast route from Tucson and Phoenix (via Interstate 10) to the Mexican Border.
The highway is a portion of the United States section of the CANAMEX Corridor, a trade corridor that stretches north from Mexico across the United States to the Canadian province of Alberta.
In Nogales, Arizona, the southern terminus of I-19 is at West Crawford Street, adjacent to the international port of entry, and southbound travelers can continue into Nogales, Sonora, Mexico, via state-maintained surface roads, and connect with Mexico Federal Highway 15 either to the south or west of Nogales, Sonora. Starting from the southern terminus at kilometer post zero, I-19 initially heads briefly south then west on surface streets, navigating its way through the town of Nogales for two tenths of a mile before becoming an interstate grade highway and making the turn to head north toward Tucson. It interchanges with two other state highways near the southern end of the route, SR 189 at exit 4 and SR 289 at exit 12. The interchange with SR 189 at exit 4 both serves to funnel traffic so as to bypass around Nogales, Arizona and Nogales, Sonora for travelers bound to or from Hermosillo or Mexico City, and provides for the continuous flow of freight and truck traffic through the larger Mariposa Port of Entry to Mexico 15, which has its northern terminus at the US-Mexico Border with SR 189 and its southern terminus 2,179 kilometres (1,354 mi) away in Mexico City. After exiting Nogales to the north, I-19 passes near and around a series of sparsely populated towns and retirement communities along the banks of the Santa Cruz River, including Rio Rico, Tubac, Amado, Green Valley, and Sahuarita. For several miles near Amado and Green Valley, the eastward view from I-19 provides scenic views of Madera Canyon and the Santa Rita Mountains in the Coronado National Forest. Just before entering Tucson, I-19 passes through the eastern section of the San Xavier Indian Reservation where it makes its only crossing of the Santa Cruz River. As I-19 enters the Tucson city limits, it has an interchange at SR 86 at exit 99 before reaching its northern terminus at a junction with I-10.
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