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((Short description|Interstate Highway in southern Arizona))
((Use mdy dates|date=October 2011))
((Use American English|date=March 2023))
((Infobox road
| state = AZ
| type = I
| route = 19
| map = ((maplink|frame=yes|plain=yes|frame-align=center|frame-width=290|frame-height=250|type=line|from=Interstate 19.map|stroke-width=3))
| map_custom = yes
| map_notes = I-19 highlighted in red
| length_km = 102.08
| length_ref = <ref name="ADOT Highway Log"/>
| established = 1963<ref name="ADOT Highway Log 1998" />
| direction_a = South
| terminus_a = ((jct|state=AZ|BL|19|dab1=Nogales)) in [[Nogales, Arizona|Nogales]]
| junction = <!-- Major junctions only; Only 10 most major intersections and cities belong here; please read [[WP:USRD/STDS]] for more info -->((plainlist|1=
* ((jct|state=AZ|AZ|189)) in Nogales
* ((jct|state=AZ|BL|19|dab1=Nogales)) north of Nogales
* ((jct|state=AZ|AZ|289)) in [[Rio Rico, Arizona|Rio Rico]]
* ((jct|state=AZ|AZ|86)) in [[Tucson, Arizona|Tucson]]
))
| direction_b = North
| terminus_b = ((jct|state=AZ|I|10)) in Tucson
| counties = [[Santa Cruz County, Arizona|Santa Cruz]], [[Pima County, Arizona|Pima]]
| previous_type = I
| previous_route = 17
| next_type = AZ
| next_route = 24
))
'''Interstate&nbsp;19''' ('''I-19''') is a north–south [[Interstate Highway]] located entirely within the US state of [[Arizona]]. I-19 travels from [[Nogales, Arizona|Nogales]], roughly ((convert|90|m|ft|sp=us)) from the [[Mexico–United States border|Mexican border]], to [[Tucson, Arizona|Tucson]], at [[Interstate 10 in Arizona|I-10]]. The highway also travels through the cities of [[Rio Rico, Arizona|Rio Rico]], [[Green Valley, Arizona|Green Valley]], and [[Sahuarita, Arizona|Sahuarita]].

Having a total length of just over ((convert|102|km|mi|sp=us)), I-19 is the seventh-shortest primary (two-digit) Interstate Highway in the contiguous 48&nbsp;states, where only [[Interstate 87 (North Carolina)|I-87]] (North Carolina), [[Interstate 97|I-97]] (Maryland), [[Interstate 86 (Idaho)|I-86]] (Idaho), [[Interstate 14|I-14]] (Texas), [[Interstate 11|I-11]] (Nevada), and [[Interstate 2|I-2]] (Texas) are shorter.

While the highway is short, it is a very important corridor, serving as a fast route from Tucson and [[Phoenix, Arizona|Phoenix]] (via I-10) to the Mexican border. The highway is a portion of the US section of the [[CANAMEX Corridor]], a trade corridor that stretches north from [[Mexico]] across the US to the [[Canada|Canadian]] province of [[British Columbia]].

==Route description==
[[File:I-19 southern terminus.jpg|thumb|left|I-19 becomes an at-grade divided freeway just west of its southern terminus in Nogales. The US–Mexico border is just south of the Interstate (left of image).]]
In [[Nogales, Arizona|Nogales]], the southern terminus of I-19 is at West Crawford Street, adjacent to the international port of entry, and southbound travelers can continue into [[Heroica Nogales, Mexico]], via state-maintained surface roads, and connect with [[Mexican Federal Highway 15|Federal Highway&nbsp;15]] (Fed.&nbsp;15) either to the south or west of Nogales, Sonora.<ref name=google>((google maps |url = https://maps.google.com/maps?f=d&hl=en&geocode=15839470934785341138,31.334684,-110.941493&saddr=W+Crawford+St%2FI-19+%4031.334684,+-110.941493&daddr=32.198712,-110.978565&mra=mi&mrsp=1,0&sz=16&sll=32.196678,-110.978479&sspn=0.008207,0.01442&ie=UTF8&ll=31.814563,-111.011353&spn=1.054928,1.845703&z=9 |title = Overview Map of I-19 |access-date = February 15, 2008 ))</ref>

Starting from the southern terminus at kilometer post&nbsp;0 ([[#Signage|not milepost&nbsp;0]]), I-19 initially heads briefly south then west on surface streets, navigating its way through the town of Nogales for ((convert|0.2|mi|km|sp=us|order=flip)) before becoming an [[Interstate Highway standards|Interstate-grade freeway]] and making the turn to head north toward Tucson. It has interchanges with two other state highways near the southern end of the route, [[Arizona State Route 189|State Route&nbsp;189]] (SR&nbsp;189) at exit&nbsp;4 and [[Arizona State Route 289|SR&nbsp;289]] at exit&nbsp;12. The interchange with SR&nbsp;189 at exit&nbsp;4 both serves to funnel traffic so as to bypass around Nogales and Heroica Nogales for travelers bound to or from [[Hermosillo]] or [[Mexico City]] and provides for the continuous flow of freight and truck traffic through the larger [[Nogales-Mariposa Port of Entry]] to Fed.&nbsp;15, which has its northern terminus at the US–Mexico border with SR&nbsp;189 and its southern terminus ((convert|2179|km|mi|sp=us)) away in Mexico City.<ref>((cite map |url = http://www.viamichelin.co.uk |title = Calculate your route |publisher = Michelin |access-date = August 11, 2010 ))<!--End points were Nogales and Cuidad de México; kilometers were chosen as this road is in Mexico--></ref> 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 (Arizona)|Santa Cruz River]], including [[Rio Rico, Arizona|Rio Rico]], [[Tubac, Arizona|Tubac]], [[Amado, Arizona|Amado]], [[Green Valley, Arizona|Green Valley]], and [[Sahuarita, Arizona|Sahuarita]]. For several miles near Amado and Green Valley, the eastward view from I-19 provides scenic views of [[Madera Canyon (Arizona)|Madera Canyon]] and the [[Santa Rita Mountains]] in the [[Coronado National Forest]].<ref name=google/>

[[File:I-19 northbound at I-10 junction.jpg|thumb|I-19 northbound at the I-10 interchange; the downtown Tucson skyline can be seen on the left.]]
Just before entering [[Tucson, Arizona|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 with [[Arizona State Route 86|SR&nbsp;86]] at exit&nbsp;99 before reaching its northern terminus at an interchange with I-10.<ref name=google/>

Nearly the entire route of I-19 follows, or is adjacent to, the former routing of [[U.S. Route 89 in Arizona|US Route&nbsp;89]] (US&nbsp;89) and the Santa Cruz River, which flows northward from Mexico, through Tucson and usually disperses into the desert between [[Marana, Arizona|Marana]] and the [[Gila River]], southeast of [[Phoenix, Arizona|Phoenix]]. Most of the time, much of the river is dry, but heavy storms can cause it to overflow its banks, flooding farmland before reaching the Gila River.

===Signage===
((more citations needed|section|date=May 2020))
[[Image:Metric Interstate 19.jpg|thumb|Metric-unit advance guide sign on I-19, installed as part of the Valencia Road interchange renovation]]
I-19 is unique among US Interstates because signed distances are given in meters (hundreds or thousands as distance-to-exit indications) or kilometers (as distance-to-destination indications), and not miles. However, the speed limit signs give speeds in miles per hour. According to the [[Arizona Department of Transportation]] (ADOT), metric signs were originally placed because of the [[Metrication in the United States|push toward the metric system]] in the US at the time of the original construction of the highway.<ref>((cite news |first = Denise |last = Holley |date = May 14, 2009 |title = ADOT Defends Replacing Metric Signs along I-19 |url = http://www.nogalesinternational.com/news/adot-defends-replacing-metric-signs-along-i/article_47be9930-829e-579c-8c88-a706dee9cd40.html |work = Nogales International |access-date = April 23, 2014 ))</ref>

I-19 had originally been signed as it was constructed, in a series of small signing contracts that used customary units.<ref>One example of such a contract was Arizona federal-aid project I-19-1(65), covering I-19 between its Nogales terminus and the Otero TI (title sheet signed August 7, 1970).</ref> In 1980, ADOT awarded a single contract to install new signs which used metric units, to overlay customary-unit expressions on some existing signs with metric-unit expressions, to install kilometer posts, and to provide bilingual signing in select locations. The signing scheme used in 1980 provided explicit units on advance guide signs, but not on interchange sequence signs or post-interchange confirmation (distance) signs.

The expressions on advance guide signs were of the form "2&nbsp;km" (((Convert|2|km|mi|disp=output only))) for distances over ((convert|1|km|mi|sp=us|spell=in)) and "500&nbsp;m" (((Convert|500|m|mi|disp=output only))) for distances under ((convert|1|km|mi|sp=us|spell=in)), with no provision for fractional kilometrages. On advance guide signs, the metric unit expressions "km" and "m" were placed on the baseline where "MILES" would otherwise have gone but were sized so that their lowercase loop height matched the uppercase letter height of "MILES" on customary-unit signs.

The exception was a handful of advance guide signs for the SR&nbsp;86 (Ajo Way) exit, which used "KM" (in uppercase, contrary to [[International System of Units|SI]] nomenclature) on the same baseline and at the same letter height as "MILES". The 1980 signing plans also provided design details for speed limit and advisory speed signs using metric units, with the limit values enclosed in a red circle on the speed limit sign and a black circle on the yellow-background advisory signs. These speed signs all had explicit units, with "km/h" below the circle enclosing the limit value. However, the advisory signs were canceled by change order and not installed.

Had the metric speed limit sign been installed, the signed speed limit on I-19 would have been ((convert|88|km/h|mph|abbr=on)), which is a close soft-conversion of the then-existing ((convert|55|mph|km/h|abbr=on)) national maximum speed limit. As Arizona's current maximum speed limit is ((convert|75|mph|km/h|abbr=on)), the metric equivalent would most likely read ((convert|120|km/h|mph|abbr=on)). Information signs, to three distinct designs, were also placed at various locations on or near I-19 to advise motorists that the highway was signed in metric. Notwithstanding the metric legends, the signing plans were dimensioned entirely in feet and inches.<ref>Construction plans for Arizona federal-aid project I-19-1(81) (title sheet signed January 17, 1980).</ref>

In 1999, ADOT awarded two contracts (administered as a single construction project) to renew the signs along the full length of I-19. The general approach toward metric signing differed from that taken in 1980. Explicit units were given not just on advance guide signs, but also on interchange sequence signs, post-interchange confirmation signs, and community interchange signs (the last-listed had not been used in 1980). On the distance signs, "km" appeared after each kilometer measurement except when one or more of the distances was a fractional kilometer.

In such cases, all the distances were given in meters with "meters" (written out in full, not "m") after each distance value. On distance signs in general, "km" or "meters" appeared on the same baseline and with the same letter height as the distance values, while advance guide signs were formatted as in 1980. Since a typical ADOT freeway guide sign rehabilitation contract also replaces surface road signing near those roads' interchanges with the freeway, metric-unit signs also appeared on local roads near I-19, giving distances in kilometers to tourist attractions such as [[Mission San Xavier del Bac]].

As was the case in 1980, the signing plans were dimensioned in feet and inches.<ref>Construction plans for Arizona federal-aid projects NH-19-1(110) (ADOT TRACS H260701C) and NH-19-1(116) (TRACS H260702C) (most sheets sealed March 1997).</ref> However, a number of signs near the Valencia Road interchange were replaced or amended when it was converted from a [[partial cloverleaf interchange]] to a [[single-point urban interchange]] in 2000. One of these signs has a fractional kilometrage greater than ((convert|1|km|mi|sp=us|spell=in)), rendered as "1500&nbsp;m" (((Convert|1500|m|mi|disp=output only))), while others use "m" rather than "meters" as the unit expression. Metric-unit expressions on the advance guide signs installed or modified as part of this contract appear on the same baseline as the metric values, rather than on a raised baseline as on other I-19 advance guide signs. Again, the plans were dimensioned in feet and inches.<ref>Construction plans for Arizona federal-aid project ACNH-19-1(127) (TRACS H260901C) (most sheets sealed June 1999).</ref>

Citing motorist confusion arising from the metric signs on I-19, ADOT's Tucson district announced that new signs on I-19 would use [[US customary units]]. To avoid the cost of replacing the metric signs all at once, signs would be replaced in specific areas of the freeway during construction projects in those areas.<ref>((cite news |first = Susanna |last = Cañizo |date = January 19, 2004 |url = http://www.azstarnet.com/dailystar/printDS/6429.php |title = Some I-19 Metric Signs Going |work = [[Arizona Daily Star]] |location = Tucson |archive-url = https://web.archive.org/web/20050223220749/http://www.azstarnet.com/dailystar/printDS/6429.php |archive-date = February 23, 2005 |access-date = June 13, 2012 ))</ref> New signs were put into place between exit&nbsp;99 (Ajo Way) and exit&nbsp;101 (I-10) in 2004 after the completion of the new I-10/I-19 interchange.

((As of|2010)), the remainder of the project has been stalled due to local opposition, particularly from businesses that would have to change their directions.<ref name="local opposition NYT story">((cite news |last = Lacey |first = Mark |title = Metric Interstate Divides Arizonans |url = https://www.nytimes.com/2010/09/15/us/15highway.html?hpw |newspaper = [[The New York Times]] |date = September 14, 2010 |access-date = September 14, 2010 ))</ref>

A reconstruction project at the Interstate's northern terminus with I-10 in Tucson (at the interchange commonly called the Crossing) began in 2002 and was completed in August 2004.<ref>((cite web |author = Staff |url = http://www.1019crossing.com/ |title = Home Page |work = The Crossing: I-10/I-19 Interchange |publisher = Arizona Department of Transportation |archive-url = https://web.archive.org/web/20050207012249/http://1019crossing.com/ |archive-date = February 7, 2005 |access-date = November 27, 2011 ))</ref>

==History==
The first sections of I-19 to be opened to traffic were a ((convert|3|mi|km|sp=us|adj=on|order=flip)) stub from I-10 to Valencia Road, in 1962 and a ((convert|2|mi|km|sp=us|adj=on|order=flip)) stretch in [[Green Valley, Arizona|Green Valley]] in 1963. The freeway between [[Rio Rico, Arizona|Rio Rico]] and [[Nogales, Arizona|Nogales]] was completed in 1974. The major section between Green Valley and Rio Rico was finished in 1978. The official completion date of the I-19 segment between Tucson (km&nbsp;100) and Green Valley (actually Helmet Peak Road at km&nbsp;75) was February 12, 1972. A 1978 project report for [[Arizona Department of Transportation|ADOT]] lists the entire I-19 project as "completed", which includes segments between Green Valley and Nogales.

==Future==
I-19 is a very heavily traveled corridor in the Tucson metro area. The freeway is currently two lanes in both directions for most of its length, with the exception of the interchange with I-10 up until Irvington Road, where it transitions to four lanes. Current plans call for widening from Irvington Road to Valencia Road, bringing the freeway to three lanes in each direction.<ref>((cite web |author = Arizona Department of Transportation |url = http://www.azdot.gov/projects/south-central/i-19-ajo-way-traffic-interchange |title = Interstate 19: Ajo Way Traffic Interchange |publisher = Arizona Department of Transportation |access-date = September 25, 2014 ))</ref> Future plans include expansion to up to five lanes in each direction by 2030 from the crossing with I-10 to San Xavier Road.<ref>((Cite web |url = https://azdot.gov/search/content/docs%20default%20source%20projects%20final%20design%20concept%20report%20final%20environmental%20assessment%20report%20vol%201%20pdf |title = Search &#124; ADOT |publisher = Arizona Department of Transportation ))</ref>

I-19 is also part of the proposed [[Interstate 11|I-11]] corridor between [[Nogales, Arizona|Nogales]] and [[Sahuarita, Arizona|Sahuarita]].<ref name="adot1215">((Cite press release |author = ADOT Media Relations |title = Interstate 11 receives designation in federal transportation funding bill |date = December 4, 2015 |publisher = Arizona Department of Transportation |url = http://www.azdot.gov/media/News/news-release/2015/12/04/interstate-11-receives-designation-in-federal-transportation-funding-bill |quote = The Fixing America’s Surface Transportation Act, or FAST Act, formally designates Interstate 11 throughout Arizona. It states that the I-11 corridor will generally follow Interstate 19 from Nogales to Tucson, Interstate 10 from Tucson to Phoenix, and US 93 from Wickenburg to the Nevada state line. From there, the Interstate 11 corridor extends north through Nevada, and is designated as an interstate highway north of Las Vegas, through Reno, connecting to Interstate 80. |access-date = December 7, 2015 ))</ref>

==Exit list==
((jcttop|old|unit=km|length_ref=<ref name="ADOT Highway Log">((ADOT log |year = 2009 |pages = 137–145 |access-date = January 13, 2010 ))</ref>|old_ref=<ref>((ADOT log|year=1981|access-date=November 5, 2019|pages=113-121))</ref>))
((AZint|old
|ospan=2
|espan=2
|county=Santa Cruz
|cspan=15
|location=Nogales
|lspan=5
|unitdef=km
|km=0.00
|road=((jct|state=AZ|BL|19|dab1=Nogales|name1=Grand Avenue)) / Crawford Street
|notes=[[Arizona Department of Transportation|ADOT]] defines this intersection as southern terminus; former [[U.S. Route 89 in Arizona|US&nbsp;89]]&nbsp;/ [[Arizona State Route 93|SR&nbsp;93]]
))
((AZint
|unitdef=km
|km=0.28
|road=West Street
|notes=[[At-grade intersection]]; south end of freeway; road continues as Compound Street))
((AZint|old
|unitdef=km
|km=0.71
|type=incomplete
|exit=1A
|road=International Street
|notes=Southbound exit only))
((AZint|old
|unitdef=km
|km=1.90
|exit=1B
|road=Western Avenue
|notes=Signed as exit 1 northbound))
((AZint|old
|unitdef=km
|km=4.76
|old=2
|exit=4
|road=((jct|state=AZ|AZ|189|name1=Mariposa Road))
|notes=))
((AZint|old
|location=none
|unitdef=km
|km=8.55
|type=incomplete
|old=5
|exit=8
|road=((jct|state=AZ|BL|19|dab1=Nogales|name1=Grand Avenue))
|notes=Southbound left exit and northbound entrance; former [[U.S. Route 89 in Arizona|US&nbsp;89]]&nbsp;/ [[Arizona State Route 93|SR&nbsp;93]]
))
((AZint|old
|location=Rio Rico
|lspan=4
|unitdef=km
|km=12.42
|old=7
|exit=12
|road=((jct|state=AZ|AZ|289|name1=Ruby Road))
|notes=))
((AZint|old
|unitdef=km
|km=17.53
|old=10
|exit=17
|road=Rio Rico Drive / Yavapai Drive))
((AZint|old
|unitdef=km
|km=22.45
|old=13
|exit=22
|road=Peck Canyon Road))
((AZint|old
|unitdef=km
|km=25.17
|old=15
|exit=25
|road=Palo Parado Road))
((AZint|old
|location=Tumacacori-Carmen
|unitdef=km
|km=29.34
|old=18
|exit=29
|road=[[Tumacacori-Carmen, Arizona|Tumacacori-Carmen]]
|notes=[[Tumacácori National Historical Park]]))
((AZint|old
|location=Tubac
|unitdef=km
|km=34.94
|old=21
|exit=34
|road=[[Tubac, Arizona|Tubac]]))
((AZint|old
|location1=Tubac
|location2=Amado
|unitdef=km
|km=40.10
|old=24
|exit=40
|road=Chavez Siding Road))
((AZint|old
|location=Amado
|lspan=2
|unitdef=km
|km=42.84
|old=27
|exit=42
|road=Agua Linda Road))
((AZint|old
|unitdef=km
|km=48.39
|old=30
|exit=48
|road=Arivaca Road))
((AZint|old
|county=Pima
|cspan=14
|location=Green Valley
|lspan=3
|unitdef=km
|km=56.26
|old=34
|exit=56
|road=Canoa Road))
((AZint|old
|unitdef=km
|km=63.63
|old=39
|exit=63
|road=Continental Road))
((AZint|old
|unitdef=km
|km=65.74
|old=40
|exit=65
|road=Esperanza Boulevard))
((AZint|old
|location=Sahuarita
|lspan=2
|unitdef=km
|km=69.72
|old=43
|exit=69
|road=Duval Mine Road
|notes=Former [[U.S. Route 89 in Arizona|US&nbsp;89]]&nbsp;/ [[Arizona State Route 93|SR&nbsp;93]]; [[Titan Missile Museum]]))
((AZint|old
|unitdef=km
|km=75.48
|old=46
|exit=75
|road=Sahuarita Road))
((AZint|old
|location_special=[[San Xavier Indian Reservation]]
|lspan=3
|unitdef=km
|km=80.32
|old=49
|exit=80
|road=Pima Mine Road
|notes=Desert Diamond Casino, [[Tohono O'odham Nation]]))
((AZint|old
|unitdef=km
|km=87.98
|old=54
|exit=87
|road=Papago Road
|notes=Dead end, U-turn only))
((AZint|old
|unitdef=km
|km=92.04
|old=56
|exit=92
|road=[[San Xavier Mission|San Xavier]] Road
|notes=Access to [[Mission San Xavier del Bac]]))
((AZint|old
|location=Tucson
|lspan=6
|unitdef=km
|km=95.10
|old=58
|exit=95
|road=((jct|extra=airport)) Valencia Road&nbsp;– [[Tucson, Arizona|Tucson]]
|notes=[[Tucson International Airport]]))
((AZint|old
|unitdef=km
|km=98.35
|exit=98
|road=Irvington Road))
((AZint|old
|unitdef=km
|km=99.97
|old=61
|exit=99
|road=((jct|state=AZ|AZ|86|name1=Ajo Way))
))
((AZint|old
|type=incomplete
|unitdef=km
|km=101.63
|old=—

|exit=101
|road=((jct|state=AZ|I|10|dir1=east|location1=[[El Paso, Texas|El Paso]]))
|notes=Northbound exit and southbound entrance; I-10 exit 260))
((AZint|old
|type=incomplete
|unitdef=km
|km=101.84
|exit=102
|road=29th Street / 22nd Street / Silverlake Road / Starr Pass Boulevard
|notes=Northbound exit and southbound entrance))
((AZint|old
|unitdef=km
|km=102.08
|exit=—
|road=((jct|state=AZ|I|10|dir1=west|city1=Phoenix))
|notes=Northern terminus; I-10 exit 260))
((jctbtm|old|keys=incomplete))

==Business routes==
Historically, I-19 has had two [[Business route|business loops]], both of which are former sections of [[U.S. Route 89 in Arizona|US&nbsp;89]], [[Arizona State Route 93|SR&nbsp;93]], and [[Arizona State Route 789|SR&nbsp;789]]. One is currently active while the other is decommissioned. Both business loops are currently and formerly recognized under the unsigned designation '''Arizona State Route&nbsp;19 Business''' (also known as '''State Business Route&nbsp;19''').

===Nogales loop===
((Infobox road small
|state=AZ
|type=BL
|route=19
|name=Interstate 19 Business
|alternate_name=State Business Route 19 (1)
|location=[[Nogales, Arizona|Nogales]]
|length_mi=5.88
|length_ref=<ref name="ADOT Highway Log" />
|formed=1992
|yr_ref=<ref name="Nogales BL Start" />
))
((maplink|frame=yes|frame-align=right|frame-width=260|frame-lat=31.365|frame-long=-110.946|zoom=11|type=line|from=Interstate 19 Business (Nogales, Arizona).map|stroke-width=3|text=A map of the Nogales business loop. The route is highlighted in red.|align=right))
[[File:AZ 82 in Nogales.jpg|thumb|right|I-19 Bus. (Grand Avenue) junction with SR&nbsp;82 in Nogales]]
'''Interstate&nbsp;19 Business''' ('''I-19 Bus.''') begins at the Mexican border in Nogales near the southern end of the Interstate. I-19 Bus. follows Grand Avenue in Nogales and has intersections with [[Arizona State Route 82|SR&nbsp;82]] and [[Arizona State Route 189|SR&nbsp;189]] before terminating at I-19 just north of Nogales.<ref name="ADOT Highway Log" /> The route follows the former alignment of [[U.S. Route 89 in Arizona|US&nbsp;89]], [[Arizona State Route 93|SR&nbsp;93]], and [[Former state routes in Arizona#State Route 789|SR&nbsp;789]], back when all three highways traversed through southern Arizona.<ref name="AARoadsMap1963">((cite ADOT map |year = 1963 |access-date = August 24, 2018 ))</ref> The route has been commissioned as I-19 Bus. since US&nbsp;89 was decommissioned from southern Arizona in 1992.<ref name="Nogales BL Start">((ADOT res|link=no|year=1992|A|056|month=08|access-date=October 15, 2019|text=Renumber U.S. 89 from Mexico border to jct of I-19 north of Nogales))</ref>

'''Major intersections'''<br>
((jcttop|state=AZ|county=Santa Cruz|length_ref=<ref name="ADOT Highway Log" />))
((AZint
|location=Nogales
|lspan=4
|mile=0.00
|road=((jct|state=SON|FH|15|dir1=south|location1=[[Mexico]]))
|notes=[[Nogales-Grand Avenue Port of Entry|Dennis DeConcini Port of Entry]]; international border with Mexico; continues south as Mexican Federal Highway 15))
((AZint
|mile=0.14
|road=((jct|state=AZ|I|19|dir1=north|nolink1=yes|name1=Crawford Street|city1=Tucson))
|notes=[[Arizona Department of Transportation|ADOT]] defines this intersection as southern terminus of I-19))
((AZint
|mile=1.66
|road=((jct|state=AZ|AZ|82|dir1=east|name1=Patagonia Highway|city1=Patagonia))
))
((AZint
|mile=2.77
|road=((jct|state=AZ|AZ|189|dir1=south|name1=Mariposa Road|to2=to|I|19|nolink2=yes))
))
((AZint
|location=none
|mile=5.88
|type=incomplete
|road=((jct|state=AZ|I|19|dir1=north|nolink1=yes))
|notes=Northern terminus; no access to I-19 south))
((jctbtm|keys=incomplete))
((-))

===Sahuarita–Tucson loop===
((Infobox road small
|state=AZ
|type=BL
|route=19
|name=Interstate 19 Business
|alternate_name=State Business Route 19 (2)
|location=[[South Tucson, Arizona|South Tucson]]–[[Green Valley, Arizona|Green Valley]]
|formed=1992
|deleted=2004
|yr_ref=<ref name="Tucson BL Start">((ADOT res|link=no|date=August 21, 1992|year=1992|month=08|A|056|access-date=October 16, 2019|text=Renumber U.S. 89 from jct with I-19 near Green Valley to I-10 in Tucson ))</ref><ref name="Tucson BL End">((ADOT res|link=no|date=March 19, 2004|year=2004|month=03|A|09|access-date=October 16, 2019|text=Abandon B-19 (old 89) from Duval Mine Road going north to Los Reales Road; Portion goes to Pima County, portion goes to the Town of Sahuarita; PR: 9-9-27, p. 26; + various; and 92-08-A-56.))</ref>
|length_mi=20.24
|length_ref=<ref name="ADOT Highway Log 1998">((ADOT log |year = 1998 |access-date = June 10, 2019 |link = no ))</ref>
))
((maplink|frame=yes|frame-align=right|frame-width=260|frame-lat=32.05|frame-long=-110.948|zoom=9|type=line|from=Interstate 19 Business (Tucson, Arizona).map|stroke-width=3|text=A map of the Tucson business loop. The route is highlighted in red.))
'''Interstate&nbsp;19 Business''' ('''I-19 Bus.''') began at I-19 exit&nbsp;69 in Green Valley at West Duval Mine Road and South Nogales Highway. I-19 Bus. followed Nogales Highway north through unincorporated Pima County and Sahuarita into [[Tucson, Arizona|Tucson]]. In Tucson, I-19 Bus. curved from Nogales Highway onto South 6th Avenue where it served as the eastern terminus of [[Arizona State Route 86|SR&nbsp;86]] at West Ajo Way, before terminating at [[Interstate 10 in Arizona|I-10]] exit&nbsp;261 and South 6th&nbsp;Avenue in South Tucson.<ref name="ADOT Highway Log" /> The route follows the former alignment of US&nbsp;89, SR&nbsp;93, and SR&nbsp;789, back when all three highways traversed through southern Arizona.<ref name="AARoadsMap1963" /> The route was commissioned as I-19 Bus. since US&nbsp;89 was decommissioned from southern Arizona in 1992.<ref name="Tucson BL Start" /> In 2002, the state handed maintenance of I-19 Bus. between Los Reales Road and I-10 to the city of Tucson.<ref>((ADOT res|link=no|date=October 18, 2002|year=2002|month=10|A|049|access-date=October 16, 2019|text=Abandon to City of Tucson B19 from I-10 south to Los Reales Rd.))</ref> The rest of the route was handed over to Pima County and the city of Sahuarita in 2004. This also meant the designation was retired from the state highway system completely.<ref name="Tucson BL End" />

'''Major intersections'''<br>
((jcttop|state=AZ|former=yes|county=Pima|length_ref=<ref name="ADOT Highway Log 1998" />))
((AZint
|location=Green Valley
|mile=43.88
|road=((jct|state=AZ|I|19|city1=Nogales|road|West Duval Mine Road|nolink1=yes))
|notes=Southern terminus; I-19 Exit&nbsp;69; road continues west as West Duval Mine Road
))
((AZint
|location=Sahuarita
|mile=48.15
|road=[[Image:I-19 (AZ).svg|20px|alt=link=]] East Sahuarita Road to ((jct|state=AZ|I|19|noshield1=yes|nolink1=yes))
|notes=
))
((AZint
|location=Tucson
|lspan=2
|mile=60.41
|road=((jct|state=AZ|road|East Valencia Road|to2=y|I|19|I|10|BL|10|dab4=Tucson|nolink2=yes|location1=[[Tucson International Airport]]|extra=airport))
|notes=
))
((AZint
|mile=63.50
|road=((jct|state=AZ|SR|86|to2=to|I|19|dir1=west|name1=West Ajo Way|road|East Ajo Way|city1=Ajo|nolink2=yes))
|notes=Eastern terminus of SR&nbsp;86
))
((AZint
|location=South Tucson
|mile=64.12
|road=((jct|state=AZ|I|10|road|South 6th Avenue|city1=Casa Grande|location2=[[El Paso, Texas|El Paso]]))
|notes=Northern terminus; I-10 Exit&nbsp;261; road continues north as South 6th Avenue
))
((jctbtm))
((-))

==See also==
((Portal|Arizona|U.S. Roads))
* [[List of Interstate Highways in Arizona]]
* [[Metrication in the United States]]

==References==
((Reflist))

==External links==
((Commons category|Interstate 19))
((AttachedKML|display=title,inline))
* [http://www.arizonaroads.com/interstate/i19.html I-19] at Arizona Roads
* [http://www.interstate-guide.com/i-019.html I-19] at AARoad's Interstate Guide

((interstates))
((Authority control))

((DEFAULTSORT:I19))
[[Category:Interstate Highway System|19]]
[[Category:Interstate Highways in Arizona|19]]
[[Category:Transportation in Tucson, Arizona]]
[[Category:Transportation in Pima County, Arizona]]
[[Category:Transportation in Santa Cruz County, Arizona]]
[[Category:Metrication in the United States]]

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Retrieved from "https://en.wikipedia.org/wiki/Interstate_19"