on two rocks at the narrowest point of the creek. At 34.2 m (112 ft)
clear span, the structure is quite possibly the second largest extant
Roman arch bridge. It is 120 m (390 ft) long and 7 m (23 ft) wide.
The bridge was rebuilt by the Legio XVI Gallica, garrisoned in the ancient city of Samosata (today Samsat) to begin a war with Parthia. Commagenean cities built four Corinthian columns on the bridge, in honor of the Roman Emperor Lucius Septimius Severus (193–211), his second wife Julia Domna, and their sons Caracalla and Publius Septimius Geta as stated on the inscription in Latin on the bridge.
Two columns on the Kâhta side are dedicated to Septimius Severus
himself and his wife, and two more on the Sincik side are dedicated to
Caracalla and Geta, all in 9–10 m in height. Geta's column, however, was
removed after his assassination by his brother Caracalla, who damned Geta's memory and ordered his name to be removed from all inscriptions.
The Severan Bridge is situated within one of the most important national parks in Turkey, which contains Nemrut Dağı with the famous remains of Commagene civilization on top, declared as World Cultural Heritage site by UNESCO.
In 1997, the bridge was restored. Vehicular traffic was restricted to
5 tons or less. The bridge is now closed to vehicles, and a new road
bridge has been built 500 m (550 yd) east of the old bridge.