Collapse of steel rail bridge over the Ashtabula River in Ohio on 29 December 1876. The bridge failure was caused by design flaws - the truss members merely rested upon each other instead of being bolted together.

Collapse of steel rail bridge over Firth of Tay (Scotland) in 1879, owing to miscalculations and strong winds.

The collapse of the I-35W bridge over the Mississippi River in the US state of Minnesota on 1 August 2007.

The Silver Bridge over the Ohio river, USA, named because of its shiny silver paint, collapsed after a holding pin came loose.

One of the longest cantilevel bridges in the world spans the St Lawrence River in Quebec. The bridge collapsed twice during its construction.

In 1987 the motor bridge over Schoharie Creek in New York state collapsed after scour weakened the foundations.

Scour is the erosion of waterway soils and sediment that support bridge foundations. Soil is loosened from bridge supports and abutments that fortify each end of the bridge. One of the biggest causes of bridge failure, next to human failure, is scour.

The Tacoma Narrows suspension bridge (Galloping Gertie) collapsed four months after its opening in 1940.