This unique pony truss bridge crosses Le Sueur Creek along MN-112, near US Highway 169.
The bridge features a pair of pony truss spans. These trusses follow a standard Double Intersection Warren design.
Originally, these spans were part of a series of 10 pony truss approach spans to a bridge across the St. Croix River at Hudson, Wisconsin; constructed in 1881. As the approach was filled in 1899 to allow for double track, a large causeway was built and the trusses were reused at various locations.
Four trusses were shipped here in 1899. As part of the strengthening, four spans were combined to two with new floors and double trusses. New floor systems were installed during the remodeling.
The original bridge at this location was a girder. An overpass in Illinois states that the trusses were from "Bridge 308", possibly implying the old bridge. It is possible that this "girder" was actually a lattice girder, also known as a pony truss.
The current bridge consists of a pair of double trussed riveted double intersection warren spans. These spans rest on concrete and stone substructures.
An identical span exists in Central Wisconsin. With features similar to this bridge, the Wisconsin Bridge has an unknown history.
Overall, the bridge appears to be in good to fair condition. This truss has not deteriorated as quickly as other trusses of the same era, due to the trusses actually being nearly 20 years older, and likely construction of iron. This is the only remaining truss on the route between St. Paul and Mankato.
The author has ranked this unique bridge as being highly significant, due to the unique design.
The photo above is an overview.