Chushul Chakzam is a structure built in 1430 by Thang Tong Gyalpo which literally means iron bridge."
It 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. 
