Onion Creek Bridge, Spanning Onion Creek .1 mile South of U.S. 166, Coffeyville, Montgomery County, KS
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Significance: From the National Register nomination: "The bridge is unique in that it is one of only two vertical end post Parker trusses in Kansas, and retains a high degree of its integrity. It is also unique in the fact that it is the earliest found use of a concrete floor on a metal truss bridge in the state. Research into inventories of bridges conducted by various other states failed to locate any similar structures."
Survey number: HAER KS-8
Building/structure dates: 1911 Initial Construction
National Register of Historic Places NRIS Number: 89002172