Arizona State Route 189 constitutes a 3.76 mile long route in Nogales connecting Business Loop I-19 (Grand Avenue) and Interstate 19 to the Mexican Border. This road was built as a connector to a new Border Crossing built by Mexico in the early 1970s at Nogales. Historically the alignment of State Route 189 was evaluated as a potential route for Interstate 19.
Addressing increasing truck traffic along the route, the Arizona Department of Transportation (ADOT) commenced a $138 million project along SR 189 in 2020. Completed in Fall 2021, construction widened SR 189 from just north of the Mariposa Port of Entry to Grand Avenue, added a roundabout at SR 189 and Target Range Road, and built flyovers linking SR 189 north with I-19 north and I-19 south to SR 189 south.
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| Interstate 19 south connects with SR 189 (Mariposa Road) at Exit 4. Flyovers were constructed above this ramp in 2020-19. 10/25/08 |
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| SR 189 heads west from Interstate 19 to a signalized intersection with Frank Reed Road. Flyovers with I-19 extend bypass the forthcoming signal. 07/26/08 |
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| SR 189 reassurance marker posted west of Frank Reed Road. 07/26/08 |
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| The SR 189 border crossing is open from 6 AM to 10 PM daily. The Nogales border crossing is the only 24 hour one, located along Grand Avenue south of Downtown. 07/26/08 |
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| All truck traffic must turn into the truck crossing in one mile. 07/26/08 |
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| SR 189 was designed to be a truck bypass of Downtown Nogales, which is why there is heavy emphasis on truck traffic. 07/26/08 |
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| This is the final distance sign to the truck crossing. 07/26/08 |
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| SR 189 enters the Mariposa Port of Entry just beyond the turn for the last business before crossing into Mexico. 07/26/08 |
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| SR 189 (Mariposa Road) east at Target Range Road. 07/26/08 |
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| SR 189 next crosses Mariposa Canyon. Mariposa Road follows the canyon away from the border crossing. 07/26/08 |
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| This sign warns through trucks to avoid SR 82 east out of Nogales. 07/26/08 |
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| Flyovers separate from SR 189 (Mariposa Road) east ahead of Frank Freed Road for Interstate 19 northbound. 07/26/08 |
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| A diamond interchange follows Frank Reed Road along SR 189 for I-19 south to Downtown Nogales. 07/26/08 |
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| Confirming marker posted beyond Interstate 19. 04/26/17 |
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| Retail lines both sides of SR 189 (Mariposa Road) east between I-19 and Business Loop I-19 (Grand Avenue). 04/26/17 |
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| Mastick Way north ties into SR 189 across from Mariposa Mall. 04/26/17 |
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| SR 189 concludes at Business Loop I-19 (Grand Avenue) across from Calle Sonora. 04/26/17 |
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| Business Loop I-19 (Grand Avenue) south connects with the west end of SR 82. SR 82 northeast to Patagonia and Sonoita travels through rugged terrain and navigates through many sharp curves. 04/26/17 |
Page Updated 04-18-2022.
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