To dream that you are crossing a bridge signifies an important decision or a critical junction in your life. This decision will prove to be a positive change filled with prosperity and wealth in the horizon.
Bridges represent a transitional period in your life where you will be moving on to a new stage. If the bridge is over water, then it suggests that your transition will be an emotional one. If you fall off the bridge and into the water, then the dream indicates that you are letting your emotions hold you back and prevent you from moving forward.
Alternatively, the bridge may indicate that you are trying to "bridge" or connect two things together.