A bridge is often symbolized in dreams as any transition the dreamer may be facing in real life. Sigmund Freud gave an example before of a woman who wanted to be a man, and she would dream of bridges that wouldn't quite reach each other.
A bridge can also be determined to be a symbol of life changes, crossing a path into new or strange territory of life, or it can even point to male sexual organs, as it "bridges the gap" between male and female sexual partners. Other times bridges can lead to symbols of birth and giving life. The bridge can be a transition from one world to the next, as giving birth is sometimes referred to.