Structural work on the Kachchi Dargah–Bidupur bridge finished in April 2026 when the last segment was placed on pier 61, and only finishing work such as road markings remained in July. The bridge is 22.76 km long — 9.76 km over the Ganga and 13 km of approaches — and 32 m wide, built for 100 km/h on 67 piers.
Built by L&T with South Korea's Daewoo at ₹4,988.4 crore, about ₹3,000 crore of it an Asian Development Bank loan, it will ease the load on the Mahatma Gandhi Setu and JP Setu and help Vaishali, Samastipur, Darbhanga and Madhubani. Its first 4.57-km stretch to Raghopur opened in July 2024.