Called the "Dragon's Jaw" (Ham Rung) by the Vietnamese, this bridge was bombed more than any other target in North Vietnam. It was bombed so often because it refused to go down. Fighter-bombers dropping iron bombs failed to even damage the bridge.
At 5,532 feet in length, it was the longest single-span bridge in North Vietnam (the Doumer Bridge in Hanoi was longer but not a single span). It was a 38-foot wide, combined highway and railway bridge. The railway occupied the center of the bridge, with two 10-foot wide roads on either side.