| CQA Four Mile Bridge | |
| Nearest City: | Thermopolis, Wyoming |
| Coordinates: | 43.6036°N -108.1967°W |
| Built: | 1927 |
| Builder: | Charles M. Smith Company |
| Architecture: | Pennsylvania through truss |
| Added: | February 22, 1985 |
| Mpsub: | Vehicular Truss and Arch Bridges in Wyoming TR |
| Refnum: | 85000423 |
The CQA Four Mile Bridge spans the Big Horn River in Hot Springs County, Wyoming. The bridge was erected in 1927-28 by the Charles M. Smith Company and spans 175feet with a total length of 295feet. The rigid 7-panel Pennsylvania through-truss was nominated for inclusion on the National Register of Historic Places as one of forty bridges throughout Wyoming that collectively illustrate steel truss construction, a technique of bridge design that has become obsolete since the mid-twentieth century. The bridge rests on concrete piers and abutments and is approached by two Warren pony trusses.[1]
The Four Mile Bridge was placed on the National Register of Historic Places in 1985.