Small post card of the aerial lift bridge with the span up and an outbound lake vessel in the canal. On Monday, July 1, 1929, the suspended car made its last trip across the canal. The bridge's modification to operate with a lift span began on April 8, 1929, with a low bid of $448,000 by the Kansas City Bridge Company. The Aerial Lift Bridge was first operated on March 19, 1930. During the shipping season it makes about 25 lifts a day.