short tons (54 tonnes) and could carry 350 people plus wagons, streetcars or automobiles. A trip across the canal took about one minute, and the ferry car moved across once every five minutes during busy times of the day. A growing population on Minnesota Point, a greater demand for cars, and an increase in tourism soon meant that the bridge's capacity was being stretched to the limit. A remodeling was planned that would remove the gondola and incorporate a lifting platform into the structure. The firm finally commissioned with designing the new bridge was the descendant of Waddell's company. The new design, which closely resembles the 1892 concept, is attributed to C.A.P. Turner. Reconstruction began in 1929. In order to ensure that tall ships could still pass under the bridge, the top span had to be raised to accommodate the new deck when raised. The support columns on either side were also modified so that they could hold new counterweights to balance the weight of the lifting portion. The new bridge first lifted for a vessel, the U.S. Army Corps of Engineers tugboat Essayons, on March 29, 1930. 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 . 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-short is known as the Captain's Salute and is the most common of the ship signal exchanges. However, on November 10th, the anniversary of the sinking of the with all hands in Lake Superior, the Lift Bridge exchanges a special salute with the when it comes into Duluth Harbor in honor of the Fitzgerald and its crew as the Anderson was the last lake freighter to have contact with the Fitzgerald before it went down and was the first vessel on scene to search in vain for survivors. The exchange is known as the master salute consisting of the horn sequence of long-long-long-short-short. The bridge was designated as a National Historic Civil Engineering Landmark by the American Society of Civil Engineers in 2017. Gallery See also List of bridges documented by the Historic American Engineering Record in Minnesota Transporter bridge – other similar bridges in the world Tees Newport Bridge John A. Blatnik Bridge – the nearby