Planned roadway improvements to TH 12 required a new railroad bridge in Maple Plain, Minnesota. TKDA was commissioned by Minnesota Department of Transportation to provide the design of the new bridge.
In order to accommodate the expansion of a two-lane highway to a separated four-lane highway, TKDA designed a two-span built-up steel plate-girder bridge. Each span is 92 feet long and has four 4-foot 8-inch welded steel-plate girders. The substructures are designed to allow for the expansion of the superstructure from a single track to a double track rail line. During construction of the proposed bridge, railroad traffic was diverted to a shoo-fly alignment requiring extensive use of temporary sheet-pile retaining walls.