The Seongsu Bridge is a bridge over the Han River in Seoul, South Korea. It links the Seongdong and Gangnam districts. The cantilever bridge was completed in 1979 and its total length is 1160 m.

Seongsu Bridge
Seongsu bridge night.JPG
The rebuilt Seongsu Bridge on February 2008.
DateOctober 21, 1994 (1994-10-21)
Time07:40am KST
LocationHan River, Seoul, South Korea
Deaths32
Non-fatal injuries17
Seongsu Bridge
Hangul
Hanja
Revised RomanizationSeongsu Daegyo
McCune–ReischauerSŏngsu Taegyo
Collapsed bridge in 1994

The original bridge collapsed early in the morning of October 21, 1994, when one of its concrete slabs fell due to a failure of the suspension structure. This structural failure was caused by improper welding of the steel trusses of the suspension structure beneath the concrete slab roadway. 32 people died and 17 were injured in the accident. Afterwards, the bridge was supposed to be repaired, but because of a weakness in the structure, it had to be completely redesigned and rebuilt. The new design was finished on 15 August 1997, and is similar to the original design.

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Coordinates: 37°32′15″N 127°02′06″E / 37.53750°N 127.03500°E / 37.53750; 127.03500