Keigley Branch Bridge, Spanning Keigley Branch, Gilbert, Story County, IA

Significance: Although the arch was not the preferred bridge type of the Iowa State Highway Commission, state engineers designed several reinforced concrete arches during the 1910s. The Keigley Branch Bridge, constructed in 1913, was one of their earliest designs. With sturdy proportions and generous wingwalls, its plan incorporated many of the features they believed private bridge designers neglected in order to spare expense. Conveniently located on the old Des Moines-Minneapolis Highway not far from the college town of Ames, the Keigley Branch Bridge served for many years as the Highway Commission's model arch.
Unprocessed Field note material exists for this structure: N245
Survey number: HAER IA-74
National Register of Historic Places NRIS Number: 98000483