Source: The Great Interpretation of Dreams (Ibn Sirin)
The collapse of a bridge in a dream indicates the death of a man who connects people or the corruption of a matter the dreamer relied upon.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
The collapse of a bridge indicates the death of a ruler or scholar, or the severing of ties between people.
Source: Signs in the Science of Expressions (Ibn Shaheen)
The collapse of a bridge is interpreted as worry and calamity.