Interstate 19 in Arizona


Get started Nogales
End Tucson
Length 63 mi
Length 102 km
1A Downtown Nogales

1B Target Range Road

4 Mariposa Road

8 North Nogales

12 Ruby Road

17 Rio Rico Drive

22 Rio Rico

25 Frontage Road

29 Tumacacori

34 Tubac

40 Frontage Road

42 Frontage Road

48 Valley Manor

56 San Ignacio

63 Green Valley

65 Green Valley

69 Nogales Highway

75 Sahuarita

80 Pima Mine Road

87 Frontage Road

92 San Xavier Road

95 Valencia Road

98 Irvington Road

99 Ajo Way


According to CITYPOPULATIONREVIEW.COM, Interstate 19 or I -19 is an Interstate Highway in the United States, located entirely in the southwestern state of Arizona. I-19 is a relatively short north-south route from the Mexican border at Nogales to Tucson, Arizona’s second largest city. A striking item about this highway is that the signage and exit numbering are based on the metric system, so the exit numbers and distances are based on kilometers. The highway is 102 kilometers long.

Travel directions


The highway begins just after the Mexican border, where Mexican Carretera Federal 15 merges into the United States. This is in Nogales, a border town of 21,000 inhabitants. On the other side of the border, the Mexican town of Nogales is much larger, with a population of 290,000. The first exit leads to a minor road that leads to an alternative border crossing, so you don’t have to go straight through Nogales. It ends up on a Mexican highway. The highway itself runs through desert landscape, at an altitude of about 1,100 meters. the highwayruns through the valley of the Santa Cruz River, which is still somewhat inhabited. The next place is Green Valley, which consists mainly of new housing developments. Mining takes place in this area. One soon arrives at the city of Tucson, one of the largest cities in Arizona with a population of 520,000, and 992,000 in the metropolitan area. Tucson is quite special because the city has only two highways, of which Interstate 10 is the most important. The I-19 only passes through the southern suburbs. At South Tucson, the freeway terminates at I-10, leading west to Phoenix, San Diego, and Los Angeles, and east to El Paso and San Antonio..


Most of the highway follows the route of the former US 89. The first section of the highway opened to traffic in Tucson in 1965. The highway was mainly constructed during the late 1960s and early 1970s, with the last section being opened in 1979. Between 2002 and 2005, the interchange with I-10 in Tucson was reconstructed.

Opening history

From Unpleasant Length Date
km 95 km 102 7 km 1965
km 17 km 25 8 km 1966
km 4 km 17 13 km 1968
km 80 km 95 15 km 1969
km 0 km 4 4 km 1971
km 75 km 80 5 km 1971
km 69 km 75 6 km 1972
km 51 km 69 18 km 1976
km 40 km 51 11 km 1977
km 25 km 33 8 km 1978
km 33 km 40 7 km 1979

Metric Signs

Metric sign on I-19.

On I-19, signposts use the metric system, with meters and kilometers. This is the only Interstate Highway in the United States where this is the case. The speed limit is in miles per hour. In the 1970s, when I-19 was built, there was a push in the United States to adopt the metric system. Other countries such as Canada, Australia and New Zealand also switched to the metric system at the time. In 1980, the Arizona Department of Transportation awarded a contract to make all signposts along I-19 metric. Metric signs were also installed elsewhere in the United States in the 1970s, but these have been replaced by the American system over time.

Traffic intensities

I-19 at Ajo Way in Tucson.

# 2013 2016
Exit 0 Nogales 9.400 9,600
Exit 1 Western Avenue 12,000 13,500
Exit 4 Mariposa Road 21,000 22,500
Exit 8 Grand Avenue 32,000 32,600
Exit 12 Pena Blanca Road 24,000 27,400
Exit 17 Rio Rico Road 18,000 18,000
Exit 34 Tubac 16,000 17,800
Exit 48 Arivaca Road 20,000 38,700
Exit 63 Green Valley 33,000 31,500
Exit 75 Sahuarita 35,000 41,600
Exit 95 Valencia Road 69,000 71.700
Exit 98 Irvington Road 81,000 86,900
Exit 99 Ajo Way 89,000 103,700

Lane Configuration

From Unpleasant Lanes Comments
exit 0 Exit 99 2×2
Exit 99 Exit 101 2×3 Tucson

Mike O’Callaghan-Pat Tillman Memorial Bridge

Mike O’Callaghan–Pat TillmanMemorial Bridge
Spans Colorado River
Lanes 2×2
Total length 579 meters
Main span 323 meters
Bridge deck height 270 meters
Opening 19-10-2010
Traffic intensity 15,000 mvt/day
Location Map

According to ASK4BEAUTY, the Mike O’Callaghan–Pat Tillman Memorial Bridge, also known as the Hoover Dam Bypass is a concrete arch bridge in the United States, located on the border of the states of Arizona and Nevada.


The bridge spans the Colorado River right next to the Hoover Dam. The bridge has a total length of 579 meters and a main span of 323 meters. The bridge deck is above the arch and is 270 meters above the river. It is the highest concrete arch bridge in the world. Over the bridge, US 93 in Arizona and US 93 in Nevada run from Phoenix to Las Vegas in 2×2 lanes. The bridge is toll-free.


Between 1931 and 1936, the Hoover Dam was built on the Colorado River, creating Lake Mead, which supplied the southwestern United States with water. When it opened in 1935, US 93 was routed over it, connecting the then small towns of Las Vegas (pop. 5,000) and Phoenix (pop. 48,000). Both cities grew very quickly from the 1950s, but US 93 remained a two-lane bottleneck. Because the Hoover Dam was still some distance from Las Vegas, commuter traffic in this area was non-existent. However, through traffic was mixed with tourist traffic and pedestrians on the road over the dam.

In 1995, US 93 over the Hoover Dam became part of the CANAMEX Corridor, later to be expanded as Interstate 11. From the late 1990s, the procedures for a bypass at the Hoover Dam were completed. After the September 11, 2001 attacks, the bridge was prioritized because the Hoover Dam would be an easy target for truck bombs, which could endanger the energy and water supplies of southwestern United States.

The bridge was built in 5.5 years between February 2005 and October 2010. The bridge was opened on October 16, 2010, once for pedestrians, and on October 19, 2010 for motorized traffic. The construction of the landmark bridge was covered in many magazines, TV shows and on the Internet because of the technical challenges of building a large arch bridge in a canyon. The Hoover Dam Bypass project cost $240 million, including $114 million for the bridge itself.

The bridge is named after Mike O’Callaghan (1929-2004) who was governor of Nevada between 1971 and 1979, and Pat Tillman (1976-2004) an American football player who enlisted in 2002 and was killed in 2004 by friendly fire. When opened, the bridge was the second tallest in the United States (after the Royal Gorge Bridge ) and the world’s tallest concrete arch bridge. The bridge also has the longest concrete arch in the Western Hemisphere.

Traffic intensities

Approximately 15,000 vehicles cross the bridge every day.

Mike O'Callaghan-Pat Tillman Memorial Bridge