Mahatma Gandhi Setu  was innaugurated by the then former Prime Minister, Indira Gandhi in May 1982. The Mahatma Gandhi Setu (bridge), one of Asia’s longest bridge, linking Patna and north Bihar. Patna is located on the south bank of the river Ganga.The bridge is 5450 meters in length and the longest in the world. Gandhi Setu has helped in better traffic management and speedy transportation in the entire region.

Mahatma Gandhi Setu consists 46 spans of 121.065 Meter each and 2 spans of 63.53 Meter at each end. The deck provides for a 7.5M wide 2 lane roadway for IRC class 70 R loading with 2M wide footpaths on either side. The cantilever segmental construction method is adopted to construct this mega bridge. This bridge was built by Gammon India Limited.  650 million or 65 crore (at 1972 prices of India) rupees were spent on constructing this bridge.

The Indian postal department issued a commemorative postage stamp on Landmark Bridges Of India. Mahatma Gandhi Setu of denomination 0500Paise on 17 August 2007.
Currently this is part of National Highway .