Banpo Bridge, Double-deck girder bridge over Han River in Seoul, South Korea

Banpo Bridge is a double-deck girder bridge spanning the Han River in Seoul, connecting Seobinggo-dong and Banpo-dong districts with its multiple traffic lanes. The structure incorporates a fountain system embedded along its length that shoots water into the air during evening hours.

Construction began in 1980 and finished in 1982, making this South Korea's first double-deck bridge structure. The project represented a significant advancement in Seoul's urban transportation infrastructure.

The fountain was first called simply "Rainbow Fountain" and was renamed Moonlight Rainbow Fountain on 30 March 2009. From May to October, Banpo Hangang Park holds the Moonlight Square Cultural Weekend every Saturday from 7:00 to 8:30 p.m., with classical music and commentary, a cappella, popera, jazz, brass bands and orchestras.

The bridge carries six lanes of traffic and is not open to pedestrians; walkers use the Jamsu Bridge directly beneath it, which has a bike lane and footpath. The fountain runs five to six times daily from April to October, weather permitting, and stops when wind exceeds 7 m/s or rain is forecast.

The fountain system uses 38 pumps to spray water across a wide span of the river while creating a coordinated art show with light and motion. This technical achievement is known internationally for its scale and synchronized precision.