DAIR Sixmile Creek Bridge

Deck Plate Girder Bridge over Sixmile Creek
Chatsworth, Sioux County, Iowa

Click the Photo Above to See All Photos of This Bridge!
Name DAIR Sixmile Creek Bridge
Built By Chicago, Milwaukee St. Paul & Pacific Railway
Contractor Unknown
Currently Owned By D&I Railroad
Length 159 Feet Total, 65 Foot Main Span
Width 1 Track
Height Above Ground 15 Feet (Estimated)
Superstructure Type Deck girder and Trestle
Substructure Type Timber Pile
Date Fabricated 1903
Date Erected 1934
Original Location Bridge #I-792; Elmira, Missouri
Traffic Count 2 Trains/Day (Estimated)
Current Status In Use
DAIR Bridge Number T-546
Significance Local Significance
Documentation Date September 2021
In 1878, the Sioux City & Pembina Railway built a line from Elk Point, South Dakota to Sioux Falls, South Dakota.

The line crossed across the Big Sioux a number of times, crossing between Iowa and South Dakota.

The line was merged into the Sioux City and Dakota Railroad in 1879.

By 1881, the line became a branch of the Chicago, Milwaukee & St. Paul Railway, also known as the Milwaukee Road.

In 1913, following an escapade to the Pacific Ocean, the railroad became known as the Chicago, Milwaukee St. Paul & Pacific Railway.

Heading north out of Sioux Falls, the Milwaukee Road also operated a branch to North Dakota.

By 1981, with the Milwaukee Road falling to bankruptcy, the Dakota & Iowa (D&I) Railroad was formed as a joint coalition between Iowa and South Dakota to operate the former branch to Sioux City.

Today, D&I continues to operate the line from Sioux Falls to Sioux City, as well as the Dell Rapids branch.

Located along Iowa Highway 12 north of Chatsworth, this deck girder bridge crosses Sixmile Creek.
Built in 1934, the bridge consists of a twinned deck girder span, approached by trestle. It rests on timber substructures. The girders use a fishbelly design, which was often used for greater strength while saving materials or space.
The main deck girder was originally built in 1903 across the Crooked River near Elmira, Missouri. When a new line opened, the old bridge was disassembled, twinned and reused here. It is possible that the girder was originally fabricated by McClintic-Marshall Company.
Spans like this were commonly used due to the ease of construction. It is likely that this span replaced an older trestle.
Overall, the bridge appears to be in fair condition, with no major deterioration visible.

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


Source Type


Build Date South Dakota State Historical Society
Railroad Line History Source ICC Valuation Information, Compiled by Richard S. Steele

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