This undated postcard shows a freighter entering the Duluth Shipping Canal at some point in the early 1900s.

The caption on the back of the card reads:

Opening of Navigation Season, First Giant Freighters Entering Duluth-Superior Harbor
The navigation season for Duluth-Superior harbor for Interlake navigation is approximately from April 15th to December 15th or about eight months. This view shows the giant freighters on their first trip of the season to the head of the Great Lakes, as they enter Duluth-Superior harbor.

The start of the 2022 shipping season was March 25. The first oceangoing vessel of the season arriving in the Port of Duluth-Superior was the Resko, a 624-foot bulk carrier from the Polsteam fleet, which passed under the Aerial Lift Bridge on April 13.