Corbett's/Eby's Mill Bridge

Destroyed by flooding
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Also known as: Eby's Mill Bridge
Spans Maquoketa River, Scotch Grove Township, Scotch Grove, Iowa

Lost bowstring pony truss bridge over Maquoketa River in Scotch Grove, lost in flooding July 24, 2010



The Corbett's Mill bridge is an example of what was once a common bridge form: the bowstring arch-truss. In the 1860s and 1870s bowstring arch-trusses were used extensively because of their great structural efficiency and relatively low construction costs. During this period many thousands of bowstring arch-trusses were built in the nation. Because the development of Iowa's transportation system coincided with this period, the number of bowstrings built in the state numbered in the many hundreds. Most of these were built by the large Ohio bridge companies, such as the King Iron Bridge and Manufacturing Company, the Massillon Bridge Company, and the Wrought Iron Bridge Company. The Corbett's Mill bridge is an excellent example of a bowstring arch-truss that was built by a smaller company: the Buckeye Bridge Company, also of Ohio. -- Historic American Engineering Record (HAER IA-60)

National Register information 

Posted to the National Register of Historic Places on April 11, 1985
Reference number
Architectural style
Other architectural type; Arch beam truss
Area of significance
Level of significance
Evaluation criteria
A - Event
Property type
Historic function
Periods of significance
1900-1924; 1875-1899; 1850-1874
Significant year

Update Log 

  • September 12, 2012: Updated by J.R. Manning: Added Destruction Date



Corbett's/Eby's Mill Bridge
Posted September 28, 2011, by Steve Hanken (cranken [at] inav [dot] net)

Bridge washed out in a flood recently after the land owner had spent an inordinate amount of money replacing the deck and restoring the bridge piers.