About
The Kacchi Dargah-Bidupur Bridge will be India's longest river bridge when complete — a 9.76 km six-lane access-controlled crossing of the Ganges, surpassing both the existing 5.575 km Mahatma Gandhi Setu (downstream Patna) and the 9.15 km Bhupen Hazarika Setu (Assam).
The project is executed by a consortium of Korea's Daewoo E&C and India's SP Singla Constructions under a MoRTH-funded EPC contract. The alignment includes five extra-dosed cable-stayed spans (a hybrid of cable-stayed and PSC box-girder) at the river's main navigation channels, plus standard 30-40 m PSC continuous box-girder spans across the rest.
Foundations are bored cast-in-situ piles to 60 m depth — necessary because the Ganges floodplain at this site is exceptionally deep alluvium reaching beyond bedrock. The bridge is designed for 18 m river-bed scour during peak monsoon.
When opened (target 2026), the bridge will significantly relieve the chronically overloaded Mahatma Gandhi Setu downstream and provide Bihar's primary north-south road link via NH-119. It is a flagship project under PM Modi's Eastern Region infrastructure focus.
Cross-references
17Indian Standards, IRC codes, and InfraLens knowledge articles that bear on this project's design and execution. Each link opens the relevant reference page.
Related calculators
6InfraLens calculators most relevant for bridge projects.
Notable features
- India's longest river bridge when complete (9.76 km)
- Five extra-dosed cable-stayed spans at navigation channels
- 60 m deep bored piles through deep Ganges alluvium
- Designed for 18 m river-bed scour at peak monsoon
- Six-lane access-controlled (3+3)
- Daewoo E&C Korea executing alongside SP Singla India