John E. Quackenbush

of Webster City, Iowa
Douglas Avenue Bridge (Yankton County, South Dakota)
Built 1908
Lost Closed-spandrel arch bridge over Marne Creek on Douglas Avenue
Replaced by a new bridge

Oak Street Bridge (1898) (Hardin County, Iowa)
Built 1898
Lost Pratt through truss bridge over Iowa River on Oak Street
Replaced by a new bridge