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IAIS Walnut Creek Bridge (South)

Pratt Pony Truss Bridge over Walnut Creek
West Des Moines, Polk County, Iowa

Click the Photo Above to See All Photos of This Bridge!
Name IAIS Walnut Creek Bridge (South)
Built By Chicago, Milwaukee & St. Paul Railway
Contractor Wisconsin Bridge & Iron Company of Milwaukee
Currently Owned By Iowa Interstate Railroad
Length 142 Feet Total, 105 Foot Main Span
Width 1 Track
Height Above Ground 10 Feet (Estimated)
Superstructure Type Pratt Pony Truss and Trestle
Substructure Type Timber Pile
Date Fabricated 1896
Date Erected 1917
Original Location Bridge #R-18; Marquette, Iowa
Traffic Count 1 Train/Day (Estimated)
Current Status In Use
MILW Bridge Number Y-8
Significance Moderate Significance
Documentation Date September 2017
In April of 1875, the Des Moines, Adel and Western Railway was formed to build a line connecting Des Moines to nearby Adel.
By 1878, the route opened from the town of Waukee to Adel, a distance of approximately 10 miles. By December of 1879, a bridge was completed across the Raccoon River and work continued towards Panora.

In 1881, the route would reach Fonda.
Also in 1881, the DMA&W became part of the Des Moines Northwestern Railroad, which built from Waukee to Clive; and eventually into Des Moines.
At the end of 1888, the route reached Spirit Lake, in Dickinson County. By 1891, the entire route would contain standard gauge track.
Towards the end of the 19th Century, the Chicago, Milwaukee & St. Paul Railway was attempting to acquire the route. The deal would be finalized in 1894.

Despite acquiring the line, the Milwaukee Road never had any critical connections for the route north of Yale. As a result, the route was classified as a branch line.
By the 1970s, major abandonments began throughout Iowa as railroads consolidated routes. On this line, the first section to be removed was from Milford to Spirit Lake in 1974.
The route was later abandoned from Spender to Milford in 1978. A mass closure of the route occurred in 1980, and included portions from Clive to Yale, Spencer to Marathon and Jefferson to Albert City.
The remaining segments, from Jefferson to Yale and from Marathon to Albert City were purchased by the Chicago & North Western Railway in 1985.

By 1990, the segment from Jefferson to Herndon was abandoned, and by 1999 the segment from Herndon to Yale would also be abandoned.
The C&NW became a part of Union Pacific Railroad in 1995. Today, they operate one sole portion of this line, from Albert City to Marathon as the Laurens Subdivision.
South of Jefferson, the route is a trail extending to Clive.
02/25/23


This Pratt Pony Truss bridge crosses Walnut Creek near the intersection of Grand Avenue and 63rd Street.
The main span of the bridge was fabricated in 1896 to cross Bloody Run Creek at Bridge #R-18 near Marquette, Iowa. In 1917, that bridge was replaced by a larger span, likely for flood control reasons and the span was moved to the current location.
The 6 Panel, Pin connected Pratt Pony Truss sits on wooden substructures and is approached by trestle approaches on either end. This type of truss is common on the Milwaukee Road, and it was a standard design from approximately 1895 to 1905.
Fortunately, the bridge continues to retain good historical integrity with little modification to the structure.

The author has ranked the structure as moderately significant, due to the truss design and age of the structure.
The photo above is an overview.

Citations

Source Type

Source

Build Date Milwaukee Road Archives at the Milwaukee Central Library
Contractor Missing Wisconsin Bridge & Iron Works plaque
Railroad Line History Source ICC Valuation Information, Compiled by Richard S. Steele



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