They needed to make it high enough 165ft(?) for ships to be able to clear it so there would be non-drawbridge access in and out of West Seattle. The big complaint, even when both drawbridges were functioning, was the frequent openings including during rush hour. Trains crossing at the east end of the bridges was another issue. It wasn’t too rare of an occurrence to finally start across the eastbound span after a ten-minute bridge opening, only to have a train come through on the other side.