Intermittent overnight closures scheduled Tuesday on SR 189, I-19 ramps

Restrictions to allow temporary striping, concrete barriers

PHOENIX – Nogales drivers can expect intermittent closures overnight Tuesday on State Route 189 and on three ramps connecting SR 189 and Interstate 19 for temporary striping and placement of temporary concrete barriers.

SR 189 will have intermittent lane closures between Loma Mariposa Road and Congress Drive from 8 p.m. Tuesday, June 30, until 6 a.m. Wednesday, July 1. At least one lane in each direction will remain open at all times.

At the same time, intermittent closures are planned for three ramps connecting SR 189 and I-19: both the northbound and southbound on-ramps from SR 189 to I-19, and the off-ramp from southbound I-19 to southbound SR 189. The ramp from northbound I-19 to SR 189 will remain open.

Drivers may want to consider using Western Avenue to access I-19 to avoid possible delays. Drivers also can follow Grand Avenue (Business I-19) north to enter northbound I-19.

The Arizona Department of Transportation is making improvements to SR 189, known locally as Mariposa Road, between the international border and Grand Avenue (Business I-19). The work includes two flyover ramps connecting SR 189 with I-19 that will allow commercial trucks to reach I-19 without stopping at three traffic signals. That will save time and money for trucking companies and make Nogales a more attractive port for international commerce. It also will improve safety by removing trucks from the route before they reach the entrance to Nogales High School.

The $134 million project, which is scheduled for completion in fall 2021, also includes building a roundabout at SR 189 and Target Range Road as well as adding a traffic signal, drainage improvements and additional upgrades along the route. The existing freeway on- and off-ramps will remain.

The work is funded in part by a $25 million investment by the Arizona Legislature and a $25 million federal TIGER (Transportation Investment Generating Economic Recovery) grant.

For more information, please visit azdot.gov/SR189.