The bridge was built in 1931 across the South Fork of the Powder River near Kaycee, Wyoming.

AJX Bridge was built to provide a river crossing for U.S. Route 87.

The steel truss cantilever bridge was a major engineering breakthrough since it can span distances of over 1,500 feet (460 m).

The future of the bridge is controlled by an agreement between the Federal Highway Administration, and several Wyoming state agencies.

[3] The AJX Bridge is rated as "structurally deficient" by the Federal Highway Administration.