Dubuque Boat & Boiler Works

of Dubuque, Iowa
The Dubuque Boat & Iron Works was a prolific boat builder between 1851 and 1972. It started out as the Iowa Iron Works in 1851 and was reincorporated as the Dubuque Boat & Boiler Works in 1905. It built, in 1901, the Sprague. The Sprague was the largest stern-wheeler tow boat in the world and set a record for tonnage in 1907.

Little is known about the company's bridge building.

Millville Road Bridge (Clayton County, Iowa)
Built 1916
Pony truss bridge over Peck Creek on Millville Road
Open to traffic