Seongsan Bridge, Road bridge in Yangpyeong-dong and Mangwon-dong, Seoul, South Korea.

Seongsan Bridge is a 1,410 m road bridge over the Han River linking Mangwon-dong in Mapo District with Yangpyeong-dong in Yeongdeungpo District, Seoul. It was built as a truss bridge of the same type as Seongsu Bridge, with crescent-shaped structures on both outer sides that give it a form seen on no other Han River crossing. It carries part of National Routes 1 and 48.

Construction of the bridge was completed in 1980 and represented an important step in improving Seoul's transportation connections. It made travel between two major districts easier and contributed to the city's urban development at that time.

The bridge carries National Routes 1 and 48 and links to the Seobu Expressway, which connects onward to the West Coast Expressway. Its opening in 1980 drew traffic away from the older Yanghwa Bridge and shortened the trip between central Seoul and Gimpo International Airport. The name comes from Seongsan-ro, the road built together with the bridge.

You can reach the bridge easily using several bus routes and nearby subway stations. If you are walking or cycling, the bridge is well accessible with safe, dedicated paths for both types of transport.

Seongsan Bridge was built in the same truss form as Seongsu Bridge, but its designers added half-moon-shaped structures along both outer sides, giving it a form seen on no other Han River crossing. It was the 12th bridge built over the Han River, and it opened on 30 June 1980.