One of the most scenic places along the Wabash Trace Nature Trail is around Malvern, where the trail crosses two large trusses.
The Silver Creek Bridge, and this bridge are two of the highlights of the 66 mile trail.
This bridge is also one of the most significant in Southwest Iowa. The bridge features a rare Whipple Truss span, which has even more rarely been converted between truss styles.
Originally, the truss span was built in 1884 to cross the Sangamon River in Decatur, Illinois. That bridge was a Whipple Deck Truss bridge, where the tracks ran on top of the truss.
That bridge was replaced in 1907 by a large concrete arch bridge. At least one span was salvaged from the old bridge, and relocated here and in 1910, American Bridge Company was tasked with the job of "modernizing" that span for use at this location.
This modernization included completely reconstructing the floor beams, removing the interior bracing, adding sway and portal bracing, and strengthening the overall structure.
This rare conversion left what was once a deck truss, as a through truss. This is the only known such conversion on this website, and possibly on any railroad in the United States.
Further upgrades occurred to the bridge in 1929, when the trestle spans were replaced; and again in 1951 when a steel stringer span was added to the bridge.
Currently, the bridge features the 9-panel, pin connected Warren Through Truss, a steel stringer span and numerous trestle spans on either side. The bridge rests on concrete and timber substructures.
The bridge has a series of plaques, all of which are the same. They are located in the upper corner of the spans, inside the truss. This unusual location is easily missed, but has allowed the plaques to remain instead of being stolen.
Like many other locations along the trail, the river has been reinforced with old box cars. This is likely due to constant flooding it sees.
Overall, the bridge is in fair to good condition. While the steel components of the bridge are in excellent condition, some of the trestle spans need immediate repairs or upgrades.
The author has ranked this bridge as being highly significant, due to the unique modifications and old age.
The photo above is a photo from the southeast corner of the bridge, while the photo below is a photo of the plaque.
Nathan Holth illustrated the conversion process in picture #22, where he noted extra holes and plates.
Special thank you to James Holzmeier for finding information on this bridge!
| Upstream | BNSF W. Nishnabotna River Bridge |
| Downstream | Confluence with E. Nishnabotna River |
