Gwansugyo, an arch bridge illustrating the traditional Daecheong style, was constructed at the present site of Cheonggye 3-ga crossroad by the Japanese in 1918. Juncheonsa (building) was constructed for dredging Cheonggyecheon. The original name of this bridge originated from Juncheonsa, and was located at the present-day Gwansu-dong, which was a place to measure water level.