Which bridge spans the waterway from Detroit, Michigan, United States to Windsor, Ontario, Canada?

Awesome to name it after a true gentleman of the sport of hockey and Detroit.

Julia, Many forget about the tunnel for cars and the train tunnel that goes across too.! ! !

Kris, the crossing in San Diego is by land. The Ambassador Bridge is the busiest, as the answer implies. I crossed that bridge many times, as I grew up in downriver Detroit.