Bridges with portions missing are obstacle dreams. It's some sort of challenge you have to overcome to get through to the other side. Bridges are traditionally transition symbols, going from one part of your life to the next, and the trouble you have crossing is your difficulty with it.
Dreams CAN predict spouses leaving, but it also may have been that there was some type of problem with your marriage, even very minor, that was causing you some unconscious insecurities about it.
Some dreams can be taken as warnings, to give the dreamer the opportunity to confront and fix whatever is the problem, but all too often people don't pay much notice to their dreams.
There are 3 different types of dream: Processing dreams which is just your mind processing all the things you have done in the day, release dreams which are to release unconscious fears or recover from traumas, and prophetic dreams which are the dreams that come true and show future.
Many people have prophetic dreams and I myself have had them since the age of 13 on a regular basis and I interpret dreams for friends and family and on here, because of this.
