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). In 1929–30, the span was converted 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 United States Army Corps of Engineers maintains a nearby maritime museum.
The bridge can be raised to its full height of 135 feet in about a minute, and is raised about 5,000 times per year.The span is about 390 feet (120 meters). As ships pass, there is a customary horn-blowing sequence that is copied back. The bridge's "horn" is actually made up of two Westinghouse Airbrake locomotive horns. Long-short-long-short means to raise the bridge, and Long-short-short is a friendly salute.
Size: The Aerial Lift Bridge card is 11 inches wide by 8 inches tall.
Quantity: One blank card + one blank envelope + one note for your own message.