The Two Drives
North Puerto Blanco Drive leaves near the visitor center and runs west and south around the Puerto Blanco Mountains. South Puerto Blanco Drive returns east along the border toward Lukeville. Run together as a circuit they come to 41 miles and most of a day.
Everything as far as the Pinkley Peak Picnic Area is two-way and open to all vehicles. Beyond it the Park Service designates the road one-way, high clearance and four-wheel drive, so a vehicle that cannot keep going has no legal way back.
Quitobaquito Springs
Quitobaquito is a spring-fed pond toward the western end of the loop, one of the few permanent surface waters in the monument, and the far point of the drive.
Two roads reach it, and the choice decides what vehicle the trip needs. The full loop arrives from the north after the one-way high-clearance section. South Puerto Blanco Drive can instead be driven out and back on its own, which the Park Service opens to vehicles under 25 feet and which carries no one-way commitment at any point. For a stock vehicle that is the practical way in.
Stops and Trailheads
Three picnic areas sit on the loop: Pinkley Peak, Golden Bell and Bonita Well. Pinkley Peak and Bonita Well have vault toilets and shade structures. Pinkley Peak is also the junction where the road changes.
Red Tanks Tinaja, Dripping Springs and Dripping Springs Mine are the trailheads along the route. A tinaja is a rock basin that holds rainwater after a storm. The two mine trails reach old workings; mineral mining here began in the late 19th century and was allowed to continue until 1976.
Access and Closures
South Puerto Blanco Drive runs close to the international boundary for much of its length, and the monument periodically closes individual roads, crossover routes and boundary corridors for infrastructure and law enforcement work. Which segments are open changes, and the monument's alerts and conditions page is what tracks it. The park answers at 520-387-6849 if one segment is the reason for the trip.
Carry water for the full day. Four to five hours is the driving estimate and not the total, there is no water and no fuel anywhere on the loop, and the Park Service recommends at least a gallon per person per day. Summer days above 100°F put the workable window between November and April.
Fuel and Water
Lukeville, about 5 miles south of the visitor center, has the nearest fuel. Why and Ajo are the options to the north. There is no fuel or drinking water on the loop itself, so both tanks need filling before leaving Arizona 85.
Nearby
Ajo Mountain Drive runs 21 miles on the east side of Arizona 85 and is the easier of the two, usually passable by all vehicles and one-way after the first mile. Pozo Nuevo Road covers 14 miles between the Puerto Blanco drives and Bates Well Road, past the Cipriano Hills, the Growler Valley and the historic Pozo Nuevo line camp, with high clearance and four-wheel drive highly recommended. Alamo Canyon Road reaches a tent-only primitive campground and takes vehicles up to 25 feet.
