Between Riverton and Baxter Springs, lies the old concrete truss "Rainbow Bridge." This classy historic Marsh Arch "Rainbow Bridge" was built in 1923. Though much smaller than the old Spring River Bridge, this beautiful old bridge did survive, and is today, the only one still standing on Route 66. Through the efforts of the Kansas Historic Route 66 Association this historic bridge was saved and restored. The bridge was completely refurbished and preserved in 1994 in a joint effort between the Route 66 Association and the Cherokee County Commission. Rainbow Arch Bridge Placed on National Register of Historic Places in 1983.