A.C. Boyle & Co.

of McGregor, Iowa
Dry Run Bridge (Clayton County, Iowa)
Built 1898
Steel stringer bridge over Dry Run on Town Road
Open to traffic

Garnavillo Township Bridge (Clayton County, Iowa)
Built 1902
Stone arch bridge over Unnamed Stream on 250th Street
Closed to all traffic

Motor Mill Bridge (1899) (Clayton County, Iowa)
Built 1899
Pratt through truss bridge over Turkey River on Galaxy Road
Destroyed by flooding in 2008; replica spans now in place and open to traffic