Aerial Lift Bridge

The Aerial Lift Bridge, earlier known as the Aerial Bridge or Aerial Ferry Bridge, is a landmark in the port city of Duluth, Minnesota. The span began life in 1905 as the United States' first transporter bridge: Only one other was ever constructed in the country, Sky Ride in Chicago. The span was converted in 1929–1930 to a vertical-lift bridge — also rather uncommon, although there are six such bridges along Ontario's Welland Canal — and continues to operate today. The bridge was added to the National Register of Historic Places on May 22, 1973. The bridge is owned and operated by the City of Duluth. The United States Army Corps of Engineers maintains a nearby maritime museum.

The bridge spans the Duluth Ship Canal, which was put through the miles-long sand spit named Minnesota Point — commonly called Park Point by locals — in 1870–1871. The natural mouth of the Saint Louis River is about seven miles farther southeast, and is split between Minnesota and Wisconsin. Creating this gap in the sand spit meant that residents who lived on the new island needed to have a way to get across. Several transportation methods were tried, though they were complicated by the weather. Ferries could work in the summer, but ice caused problems in colder months. A swinging footbridge was used, but was considered rather rickety and unsafe.

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