The McKinley Bridge is the first bridge to carry Route 66 from Illinois to Missouri - from 1926 to 1929.  It's a steel-truss bridge built from 1907 to 1910.

The bridge is 6,313-feet in length and carried both railroad and vehicular traffic for decades. By 1979, the railroad line was closed and additional lanes were opened for vehicles in the inner-roadway.

The bridge was closed in 2001, but reopened to vehicular traffic in 2007.

Today, the inner-two lanes carry vehicles across the river. The outer lanes (outside of the steel trusses) are used for pedestrians and bicyclists 

It is commonly assumed the bridge was named for President William McKinley, but was actually named for the builder, William B. McKinley, the chief executive of the Illinois Traction System interurban electric railway, which ran over this bridge.