Though more than just a bridge at the foot of highpeak mountains and Rocky coasts it continues to amaze travellers awed by the beauty of Pasaleng Bay.
Opened to traffic in 1986, the viaduct is 1.3 km long.
Although located near the bounday of Ilocos Norte and Cagayan, it remains as the most important link among six northern territories that also include the provinces of Apayao and Isabela, northeast of Luzon and Abra and Ilocos Sur, in the northwest side.
While it is a very significant factor for business and economic growth in the area it also continues to attract tourists.
Built during the administration of then President Ferdinand E. Marcos Sr., the viaduct is just part of the treacherous Patapat Road along the Pan Philippine Highway passing through the towns of Bangui, Pagudpud both in Ilocos Norte and Sta. Praxedes, the North Westernmost town of Cagayan.
This replaced the old "Kalbaryo" Road up the slopes of the rugged mountains when during the old days it took about two or even more days to travel from CAGAYAN to Ilocos especially during the rainy season from July to November.
Because of that extremely tight situation, people jokingly termed this route as Calbaryo instead of Caraballo.
This side of the range is the North Western edge of the Caraballo Mountains of which Cordillera and Sierra Madre are part of and interconnected.
