What is an aerial bridge??? That was my question when researching our trip to Duluth. But after getting into town and heading there immediately we "got" it. It raises up when a Great Lake freighter needs to enter the harbor or leave. Fun to watch at anytime of day. If you go into the Maritime Museum right beside it they have a monitor screen telling what ships and what time they will be going through so you can be aware of the bridge lifting up.
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