Koss Construction Co.
First Avenue Bridge (Linn County, Iowa)Built 1920
Open-spandrel arch bridge over Cedar River on First Avenue (Business US 151/IA 922) in Cedar Rapids
Open to traffic
Keigley Branch Bridge (Story County, Iowa)Built 1913
Concrete arch bridge over Keigley Branch on 550th Avenue
Open to traffic
Shiawasse Street Bridge (Ingham County, Michigan)Built 1923
Lost Closed-spandrel arch bridge over Grand River on Shiawassee Street in Lansing
Replaced by new bridge