The Karun 4 (Karun IV) Arch Bridge is an arch deck bridge in Lordegan, Chaharmahal and Bakhtiari province, Iran.
The 378 metres (1,240 ft) total length of the bridge comprises 15+17+300+17+17+12m span arrangement.
This arch deck bridge has an orthotropic deck system with 11.8 metres (39 ft) total width which incorporates a two-way carriageway and a walkway at each side.
The bridge flies over Karun-4 Dam Reservoir in Chaharmahal and Bakhtiari, Iran.
Access to the bridge is possible by driving through a couple of tunnels with 550 metres (1,800 ft) and 450 metres (1,480 ft) length at two sides of bridge.