logo

UP 570th Street Bridge

Deck Plate Girder Bridge over 570th Street
Williamson, Lucas County, Iowa

Click the Photo Above to See All Photos of This Bridge!
Name UP 570th Street Bridge
Built By Chicago, Rock Island & Pacific Railroad
Contractor American Bridge Company of New York
Currently Owned By Union Pacific Railroad
Length 86 Feet Total, 30 Foot Main Span
Width 1 Track
Height Above Ground 11 Feet (Estimated)
Superstructure Type Deck Plate Girder and Trestle
Substructure Type Concrete and Timber Pile
Date Built 1920
Traffic Count 10 Trains/Day (Estimated)
Current Status In Use
Bridge Number 33.90
Significance Local Significance
Documentation Date August 2019


Located north of Williamson, this deck girder bridge crosses 570th Street at 267th Avenue.
Built in 1920, the bridge features a single deck girder span, set onto concrete piers. Trestle spans approach the main span on either side. The bridge also utilizes a ballasted deck.
Several other deck girder spans of similar designs along this line were replaced around 2015. It appears most of these were open deck structures, and set onto timber piers. Fortunately, this span still appears to be in decent condition.
This type of bridge was common for both crossing small creeks and roadways, due to the simple nature of the design.
Overall, the bridge appears to be in fair to good condition, with little deterioration noted on the steel span.

The author has rated this bridge as being locally significant, due to the common design.
The photo above is an overview.

Citations

Source Type

Source

Build Date American Bridge Company plaque
Contractor American Bridge Company plaque
Railroad Line History Source ICC Valuation Information, Compiled by Richard S. Steele