The Minnesota Historical Society reports that the first bridge at this location was a wood truss bridge built in 1873. This bridge was part of a merger deal between the City of Minneapolis and the City of Saint Anthony, which occupied opposite sides of the Mississippi River. When the two cities merged, they agreed to build two bridges, one upstream of the falls, and one downstream of the falls. The bridge at Plymouth Avenue was known as the Upper Bridge.

The 1873 wood bridge was replaced with an iron truss bridge in 1886. That bridge was rebuilt in 1913, and remodeled again in 1952 and 1953. The 1950s project raised the bridge to allow small two boats and barges to travel under the bridge. By the late 1970s, the iron bridge was badly deteriorated. It was closed in 1981, and removed shortly after it was closed.

The current Plymouth Avenue Bridge opened in 1983. It was built by casting the concrete in place. Forms would be extended past the end of the bridge, concrete would be poured, and after the concrete was cured, the new section of bridge would be used as the work platform for the next section of the bridge. Once the concrete was in place, large cables were routed from end to end inside the bridge, and cable jacks were used to stretch the cables to a high tension. This has the effect of squeezing the bridge together, making the structure act like a single large beam.

The Plymouth Avenue Bridge was the first post-tensioned concrete box bridge in the state. Since it was built, variations on that method have been used on the new I-35W Saint Anthony Falls Bridge, Wabasha Street Bridge, and the Wakota Bridge.

The photo above is a view of the Plymouth Avenue Bridge looking southeast from the park along the West River Parkway. This location is about a mile upstream of Saint Anthony Falls. The photo below is a view of the Plymouth Avenue Bridge looking upstream from the northern tip of Nicollet Island.

The photo above is the first of three photos showing a typical crossing of the Plymouth Avenue Bridge heading eastbound from the west side of the Mississippi River. In this view, we are just entering the west end of the bridge. In the photo below, we are cresting the main span over the river channel.

The photo above is a view exiting the bridge on the east end heading into the Saint Anthony West neighborhood. The photo below is a view of the east end of the bridge from a street level vantage point at the corner of 8th Avenue NE and Sibley Street NE.

The photo above is a profile view of the Plymouth Avenue bridge. It is taken from the park on the west bank of the Mississippi River. The photo below is a close view of the main navigation channel. Despite having low clearance, small low-profile river boats can move one or two barges at a time through this area of the river.

These two photo are more views of the structure from the river level. In the photo above, we can see the Boom Island lighthouse, while in the photo below, we see the lumber yard on the northeast side of the structure.

The photo above shows the west end of the bridge as seen from the trail that runs along the west bank of the Mississippi River. The photo below was taken directly under the west end of the bridge. This view shows that the bridge was built as two parallel concrete boxes holding up the traffic deck as opposed to using steel or concrete girders.

The photo above is a view of the side of the Plymouth Avenue bridge and the bridge railing taken from street level. The photo below is a view of the traffic deck take from the sidewalk on the southwest corner of the bridge.