CQA Four Mile Bridge

{{Use mdy dates|date=August 2023}}

{{Infobox NRHP

| name = CQA Four Mile Bridge

| nrhp_type =

| image = CQA Four Mile Bridge.jpg

| caption =

| nearest_city = Thermopolis, Wyoming

| coordinates = {{coord|43|36|13|N|108|11|48|W|display=inline,title}}

| locmapin = Wyoming#USA

| area =

| built = 1927

| builder = Charles M. Smith Company

| architecture = Pennsylvania through truss

| added = February 22, 1985{{NRISref|2009a}}

| 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 {{convert|175|ft|m}} with a total length of {{convert|295|ft|m}}. 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.{{Cite web |url={{NRHP url|id=85000423}} |title=National Register of Historic Places Inventory - Nomination Form: CQA Four Mile Bridge |last=Fraser |first=Clayton B. |date=May 24, 1982 |publisher=National Park Service |pages=12 |access-date=2009-08-03}}

The Four Mile Bridge was placed on the National Register of Historic Places in 1985.