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BNSF Mosquito Creek Bridge #8

Warren Pony Truss Bridge over Mosquito Creek
Underwood, Pottawattamie County, Iowa

Click the Photo Above to See All Photos of This Bridge!
Name BNSF Mosquito Creek Bridge #8
Built By Chicago, Milwaukee, St. Paul & Pacific Railway
Contractor Unknown
Currently Owned By BNSF Railway
Length 123 Feet Total
Width 1 Track
Height Above Ground 15 Feet (Estimated)
Superstructure Type Warren Pony Truss
Substructure Type Concrete
Date Built 1934
Traffic Count 2 Trains/Day (Estimated)
Current Status In Use
MILW Bridge Number Z-1544
Significance Moderate Significance
Documentation Date January 2017


Located south of Neola, this large pony truss is the 7th crossing of Mosquito Creek. It is located behind the I-80 westbound rest area at Underwood.
Built in 1934, it is likely that this span replaced an older truss bridge. Currently, the bridge consists of a single 8-panel riveted Warren Pony Truss. The bridge rests on concrete substructures.
It appears that the early 1930s were a time of rebuilding along this route, and many bridges were replaced. This truss was a common design to replace smaller through trusses between 1927 and 1935.
Overall, the bridge appears to be in good condition, with little noted deterioration.

The author has ranked this bridge as being moderately significant, due to the truss design.
The photo above is an overview.

Mosquito Creek Railroad Bridges
Upstream BNSF Mosquito Creek Bridge #7
Downstream BNSF Mosquito Creek Bridge #9

Citations

Source Type

Source

Build Date Milwaukee Road Archives at the Milwaukee Central Library
Railroad Line History Source ICC Valuation Information, Compiled by Richard S. Steele