Located near Green Valley, this large truss bridge crosses the Mackinaw River parallel to IL-29.
Built in 1913 as part of a new line, the bridge features a single Quadrangular Through Truss, approached by a girder on the north side. Originally, these two spans were approached by trestle, however the north approach has been replaced with I-Beams. The bridge rests on concrete, steel and wood substructures.
The deck girder was installed in 1921, and possibly was built with secondhand material.
While nationally the Quadrangular design is uncommon, it was popular with several Midwest railroads, particularly the Chicago & North Western.
The builder, King Bridge Company, is also not known to have built many Quadrangular trusses. However, several were built along this line.
Overall, the bridge appears to be in fair to good condition. The author was not able to inspect under the truss, where other nearby similar bridges have been found with serious deterioration.
The author has ranked this bridge as being moderately significant, due to the truss design.
The photo above is an overview from IL-29.
| Upstream | CN Mackinaw River Bridge |
| Downstream | IMRR Mackinaw River Bridge |