Ansa del Tevere viaduct, Cable-stayed road bridge in Magliana, Rome, Italy

The Ansa del Tevere viaduct is a reinforced-concrete cable-stayed bridge on the A91 Rome–Fiumicino motorway in the Magliana district. Its two square-section piers, 34 m tall and slightly inclined inward, are joined only by a top crossbeam; the stay cables are embedded in square concrete casts. The western stays carry a 24.20 m wide prestressed-concrete box girder resting on the pier base, with a Gerber beam hung at its outer end on piles beyond the 1965 landslide zone. The deck curves with a 400 m radius.

A landslide on 28 June 1965 destroyed the ground under the planned Strada statale 201 dell'Aeroporto di Fiumicino. ANAS commissioned Riccardo Morandi, who chose a cable-stayed span over the slide area; the bridge opened in 1967. It was later named after Franco della Scala, director of ANAS's Centro Sperimentale Stradale, killed in the 1985 Fiumicino airport attack.

Locals call it Ponte Morandi after its designer Riccardo Morandi. In 1985 the viaduct was named for Franco della Scala, director of ANAS's road research centre at Cesano di Roma, killed in the Palestinian attack at Fiumicino airport that year. Drivers on the A91 pass beneath the single 35 m pylon, whose eastern stays are tied to concrete anchor blocks beside the carriageway.

The viaduct carries the A91 Rome–Fiumicino motorway through the Magliana district, about 3 km after the Ponte della Magliana. It is not accessible on foot; the structure is seen in passing from the carriageway. The road curves with a radius of 400 m, and lighting was installed in 2005 and renewed in 2016.

Morandi's design is atypical for him: the deck hangs from only one field on the west side of the pylon, while the eastern cables anchor into large concrete counterweight blocks beside the highway, so no A-shaped pylon was needed. The 35 m pylon stands on foundations sunk 53 m into resistant clay outside the landslide zone.