St. Paul Union Pacific Rail Bridge, also known as the Hoffman Swing Bridge,[2] is a swing bridge that spans the Mississippi River between South Saint Paul, Minnesota and Saint Paul, Minnesota in the United States.

It was built in 1910 by the St. Paul Bridge and Terminal Railway, and was rebuilt in 1925, after a flood in 1951, and again in 1982.

The current Union Pacific Railroad Albert Lea Subdivision from Des Moines, the former Rock Island "Spine Line", enters the Twin Cities area and terminates in a yard in South Saint Paul.

[5][6] The towboat was the "Cooperative Venture," owned by American River Transportation Company.

Traffic was routed to the St. Paul Union Pacific Vertical-lift Rail Bridge and other locations.