Aerial Lift Bridge

About

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, the 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. It remains in operation, owned and operated by the City of Duluth. The bridge was added to the National Register of Historic Places on May 22, 1973. 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 (11 km) 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. In 1892, a contest was held to find a solution. The winning design came from John Low Waddell, who drew up plans for a high-rise vertical lift bridge. The city of Duluth was eager to build the bridge, which would have been about 130 feet (40 m) wide. However, the War Department objected to the design, and the project was canceled before it could be built. Waddell's design went on to be built in Chicago, Illinois, as the slightly larger South Halsted Street Bridge, which was removed in 1932. New plans were later drawn up for a structure that would ferry people from one side to the other. This type of span, known variously as an aerial transfer, ferry, or transporter bridge, was first demonstrated in Bilbao's Vizcaya Bridge in 1893 and in France in 1898. Duluth's bridge was inspired by the one in France, though the actual construction is quite

Adapted from Wikipedia (CC BY-SA). Photography via Wikimedia Commons.