The Aerial Lift Bridge (earlier known as the Aerial Bridge or Aerial Ferry Bridge) is a major landmark in the port city of Duluth, Minnesota. The span began life as an extremely rare transporter bridge — the first of just two such bridges ever constructed in the United States. Originally built in 1905, the bridge was upgraded in 1929–30 to a vertical lift bridge, which is rather uncommon, and continues to operate today.
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