Water bridges - this bridge structures that support water channels, by which the navigation of relatively small vessels.They are built on rivers, valleys, rivers, railroads or highways.
suggest you the three most prominent water bridge in the world, which still then exist and function.

 Beautiful picture of river coa cristales.

In the UK, on the River Thames collapsed stairway that led to the ship during the Second World War.
While on the vessel were 170 people who were trapped.Later, all were evacuated.