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UP Boone River Bridge

Deck Plate Girder Bridge over Boone River
South of Renwick, Wright County, Iowa

Click the Photo Above to See All Photos of This Bridge!
Name UP Boone River Bridge
Built By Chicago & North Western Railway
Contractor Unknown
Currently Owned By Union Pacific Railroad
Length 245 Feet Total, 45 Foot Spans
Width 1 Track
Height Above Ground 15 Feet (Estimated)
Superstructure Type Deck Plate Girder and Trestle
Substructure Type Stone Masonry and Timber Pile
Date Built 1902
Traffic Count 2 Trains/Day (Estimated)
Current Status In Use
C&NW Bridge Number 723
UP Bridge Number 61.45
Significance Local Significance
Documentation Date March 2020
In 1874 the Des Moines and Minneapolis Railway constructed a line from Des Moines to Story City, in central Iowa. It was a narrow guage railroad, later standard in 1880.

The line was continued north by the Toledo & Northwestern Railway in late 1879, and was completed to Blue Earth, Minnesota by 1883. It was a standard gauge line. The entire line came into the Chicago North Western Railway system by 1884. The C&NW owned a large amount of track around Iowa at the time.
The line was a critical C&NW route to connect to the Twin Cities.
Starting from Des Moines, the line would start in downtown, and head north towards Ankeny.
The line would cross the east/west Milwaukee Road mainline at Slater, It would go through Kelley, crossing the Fort Dodge, Des Moines & Southern before arriving in Ames.
In Ames, it would cross Squaw Creek, and the busy C&NW east/west mainline.
Near Story City, it had to cross a high trestle over Keigly Creek, which was later filled and replaced with a stone bridge.
The line continued through Randall, crossed an east/west C&NW branch line in Jewell, and came into Webster City after crossing the Boone River.
In Webster City, it crossed the Illinois Central line again, and left town crossing the Boone River again.
Continuing north, the route went through Woolstock, and in Eagle Grove crossed a Chicago Great Western Line, and had a CNW line towards Humboldt break off.
It crossed another CGW line in Goldfield, and continued through Renwick and Lu Verne.
At Algona, it crossed over another Milwaukee Road main, and continued through Burt and Bancroft before crossing a Rock Island line near Lakota.

It crossed into Minnesota at Elmore, and joined with another CNW line at Blue Earth.

Several sections were abandoned over time. This included:

Ledyard to Blue Earth in 1968, Ledyard to Bancroft in 1978, Burt to Bancroft in 1985, and Ankeny to Ames in 1985.

The C&NW merged into Union Pacific in 1995. Since this merger, the Ankeny to Des Moines route has been abandoned and will be reused a trail.
The remaining segment, from Burt to Ames is known as the Jewell Subdivision.
06/26/21


Located southeast of Renwick, this large deck girder bridge crosses the Boone River.
Built in 1902, the bridge consists of three spans of deck plate girder, set onto stone substructures, including a large stone south abutment. In addition, the bridge is approached by 9 spans of timber trestle on the north end. The bridge is typical for this era, and no alterations have been made to the steel or stone since the original construction.
This type of bridge is commonly used to cross creeks and roads. In particular, large multi-span structures such as this are favorites for larger creeks and rivers. This is due to the ease of construction and the limited maintenance required.
Overall, the bridge appears to be in good condition. Even the wooden trestle approaches show signs of health.

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 Chicago & North Western Railway Historical Society Archives
Railroad Line History Source ICC Valuation Information, Compiled by Richard S. Steele



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