UP Timber Creek Bridge (South)

Modified Pratt Through Truss Bridge over Timber Creek
South of Marshalltown, Marshall County, Iowa

Click the Photo Above to See All Photos of This Bridge!
Name UP Timber Creek Bridge (South)
Built By Minneapolis & St. Louis Railway
Contractor Phoenix Bridge Company of Phoenixville, Pennsylvania
Currently Owned By Union Pacific Railroad
Length 116 Feet
Width 1 Track
Height Above Ground 15 Feet (Estimated)
Superstructure Type Baltimore Through Truss
Substructure Type Concrete and Stone Masonry
Date Built 1901
Traffic Count 2 Trains/Day (Estimated)
Current Status In Use
M&StL Bridge Number 322
Significance Regional Significance
Documentation Date October 2016
A brief history of the Minneapolis & St. Louis mainline from Mason City to Peoria and Albia:


Located south of Marshalltown, this unique through truss bridge crosses Timber Creek.
Built in 1901 to replace a previous, lighter bridge; this bridge a single unique through truss span with riveted connections. Unlike some of the other trusses on this route, this bridge is a Pratt through truss, despite the fact that the tension and compression members both cross two panels. In addition, the endposts on this bridge cover two panels, making it a 6 panel structure.
Between Oskaloosa and Eddyville, numerous similar bridges were constructed. However, this bridge is different, as it features heavy rolled steel vertical members, and massive laced box girders for the diagonal members. It rests on stone abutments, encased in concrete.
Diagram of bridge
Diagram of this style bridge

Unfortunately, no plaque can be found on the bridge. More research is being done on the bridge, to determine who designed and built the bridge.
Overall, the bridge appears to be in fair to good condition, with little serious deterioration. Some spalling has begun to occur on the abutments. In addition, a number of rivets have been replaced by high strength bolts.

The author has ranked this bridge as being regionally significant, due to the unique truss design and large size.
The photo above is an overview.


Source Type


Build Date ICC Valuation Summary Report, courtesy Doug Harding collection
Contractor Phoenix Bridge Works Collection at the Hagley Library and Museum
Railroad Line History Source ICC Valuation Information, Compiled by Richard S. Steele

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