List of bridges in Bhutan

Two arms with timber superimposed are built on either side of the river, above the highest flood-level point, while being weighted to allow an increasingly large cantilevering, and solid wooden beams are then fixed on each end of the arms with wooden pegs.

[8] A major innovation was created by Thang Tong Gyalpo regarding the crossing of large spans, he developed iron chains working techniques and adapted them to the construction of bridges.

By adding arsenic to the iron (a bit more than 2.8%),[9] it was easier to work with and had good resistance against rust, some of these chains are still functional today.

[4] After making more than a hundred such bridges in Tibet, Thang Tong Gyalpo came to Bhutan in 1433 where he found big iron ore deposits and locals blacksmiths, many chains forged here were shipped from Bhutan to Tibet.

This table presents the structures with spans greater than 100 metres (330 ft) (non-exhaustive list).