logo

CN Mill Creek Bridge (Dunlap)

Through Plate Girder Bridge over Mill Creek
Dunlap, Harrison County, Iowa

Click the Photo Above to See All Photos of This Bridge!
Name CN Mill Creek Bridge (Dunlap)
Built By Illinois Central Railroad
Contractor Unknown
Currently Owned By Canadian National Railway
Length 90 Feet Total, 60 Foot Main Span
Width 1 Track
Height Above Ground 10 Feet (Estimated)
Superstructure Type Through Plate Girder and Concrete Slab
Substructure Type Concrete
Date Built 1916, Using a 1901 span
Original Location Bridge #J390.98 (Bayou Goyoso, Unknown Location)
Traffic Count 2 Trains/Day (Estimated)
Current Status In Use
CN Bridge Number 468.5
Significance Local Significance
Documentation Date December 2018


Located near the town of Dunlap, this simple through girder bridge crosses Mill Creek.
Built in 1916, the bridge consists of a single through girder span, approached by a single concrete slab span on each side, and set onto concrete substructures. The main span was originally fabricated in 1901.
These types of bridges are common as permanent works, built to replace wooden trestles over larger creeks.
Overall, the bridge appears to be in very good condition, with minor deterioration.

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

Citations

Source Type

Source

Build Date 1973 Illinois Central Track Profile
Railroad Line History Source ICC Valuation Information, Compiled by Richard S. Steele