US-53 is the major through highway across northern Minnesota. It runs from Duluth, through the Iron Range, and ends in International Falls. The route was mapped and designated as a US-highway in the 1930s, and the roadway was mostly paved by 1940. The section between Duluth and the Iron Range was upgraded to a 4-lane expressway in the 1960s, a project that was not completed until the early 1970s.

On this page, we look at the northbound US-53 bridge over the St. Louis River. This is the original 2-way traffic lane of US-53, which became the northbound lanes when the new southbound lanes were added. The bridge appears to be a modern concrete deck bridge with modern style guardrails. Given that this is a 1953 era bridge, it is likely that the deck is not original and has been replaced, and the guardrails are recent modifications. The bridge is a steel girder bridge. That is likely due to this bridge being built before prestressed concrete girder bridges became common. The bridge has an unusual pier arrangement, with a single large pier sunk in the center of the river channel. Bridges of this side tend to have two piers, and tend to not place piers directly in the middle of the river channel.