Chushul Chakzam, a suspension bridge which literally means iron bridge, was built in 1430 by Thang Tong Gyalpo.
The Chushul Chakzam (Tibetan: ), or simply Chakzam which literally means "iron bridge" in Standard Tibetan, was a suspension bridge that spanned the Yarlung Tsangpo river in modern-day Quxu County near Lhasa, Tibet. 1430 (1430) It was built in 1430 by Thang Tong Gyalpo. 
