Allen Williamson Bridge is the name of a memorial bridge in Payne County, Oklahoma, named after a former State Representative who served in the Oklahoma State House of Representatives from 1966 - 1974.

The bridge carries Oklahoma State Highway 108 over the Cimarron River just north of the town of Ripley and 2.5 miles (4.0 km) north of Oklahoma State Highway 33.

[1] It is accompanied by a monument on one end of the structure and a memorial plaque placed by the Cimarron Valley Historical Society.

The location is marked by steep rust-colored hills overlooking the Cimarron River, populated by a medium coverage of trees and other foliage.

The bridge is of moderate size and of concrete construction, serving as a conduit for a two-lane highway.