UP 500th Avenue Bridge

I-Beam Bridge over 500th Avenue (County Road R38)
Ames, Story County, Iowa
Near Jordan, Boone County, Iowa

Click the Photo Above to See All Photos of This Bridge!
Name UP 500th Avenue Bridge
Built By Chicago & North Western Railway
Contractor Des Moines Steel company of Des Moines
Currently Owned By Union Pacific Railroad
Length 45 Feet Total
Width 2 Tracks
Height Above Ground 13 Feet (Estimated)
Superstructure Type Steel Stringer
Substructure Type Concrete
Date Built 1941
Traffic Count 75 Trains/Day (Estimated)
Current Status In Use
UP Bridge Number 193.35
Significance Minimal Significance
Documentation Date September 2016
A brief history of the Chicago & North Western Iowa Division mainline, now part of the Overland Route:


This standard 1940s I-Beam bridge crosses over 500th Avenue/Y Avenue just west of Ames.
The bridge is set onto concrete substructures and contains 2 sets of I-Beams, with 4 beams in each set.
Built in 1941, the bridge replaced an earlier through girder bridge, which can be seen here. Photo is courtesy of the Iowa Department of Transportation.
It is unknown why this bridge was replaced, although it could have possibly had to do with the paving of the road. It is unknown if the original span was moved to another location.

The author has ranked this bridge as being minimally significant, due to the common design and newer age.
The photo above is an overview. The bridge can be accessed from the road below.


Source Type


Build Date Des Moines Steel Company plaque
Contractor Des Moines Steel Company plaque
Railroad Line History Source ICC Valuation Information, Compiled by Richard S. Steele

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