Puente de Trujillo Alto, historic bridge in Trujillo Alto, Puerto Rico

Puente de Trujillo Alto is a Pennsylvania through-truss road bridge in Trujillo Alto, Puerto Rico, built between 1939 and 1941. Its steel members, manufactured by U.S. Steel, form a truss span that crosses the Río Grande de Loíza about 70 feet (21 meters) above the water.

The structure was built after a previous concrete bridge was destroyed by flooding in 1936 and was funded through the New Deal program. Construction was led by engineer Robert R. Prann, with steel components manufactured by U.S. Steel.

The best access is from the banks of the Río Grande de Loíza, where you can observe the steel structure from below. The historic bridge is today mainly accessible for walking and historical visits, while a modern neighboring bridge carries motor traffic.

The 1945 flood rose over the deck and nearly carried the bridge away, yet the truss held. When the adjacent four-lane concrete span opened in the mid-1980s, the old bridge was slated for demolition; local protests kept it standing. Its steel members were rolled by U.S. Steel.