《徐霞客游记·滇游日记三十三》
往西行一里，又向南陡峻地下走一里，到达坞底，有桥跨在江上，也是铁索交相连接而桥上盖了亭子的桥，这是曲石桥。
西行一里，又南向峻下者一里，及坞底，有桥跨江，亦铁锁交络而覆亭于其上者，是为曲石桥。
Went west for a mile, and then went south steeply for a mile, to reach the bottom of the dock, with a bridge across the river, also a bridge with iron chains connected and a pavilion built on the bridge, this was the Qushi bridge.