The Colorado River Bridge is a historic steel through truss bridge in Mesa County that carries US 6 across the Colorado River near De Beque. Built in 1945, the bridge is a steel rigid-connected Parker through truss and one of the important surviving historic highway bridges along Colorado’s Western Slope transportation network. It was listed in the National Register of Historic Places in 2002 as part of the Highway Bridges in Colorado Multiple Property Submission.
The bridge is significant for its association with transportation and the development of highway travel through western Colorado. Crossings of the Colorado River were essential to regional movement, connecting communities, agricultural areas, commercial routes, and access between the Front Range and the Western Slope. In places where rivers, canyons, and rugged terrain constrained travel, bridges often became critical pieces of infrastructure that shaped how routes developed and how communities remained connected.
The Colorado River Bridge also reflects the continued importance of steel truss bridge construction into the mid-twentieth century. Truss bridges use a framework of connected members arranged in triangular patterns to distribute loads across a span. A through truss carries traffic through the structural framework, making the bridge’s trusses highly visible to drivers, pedestrians, and observers. This creates a strong visual experience, especially when traveling through the bridge and seeing the steel members rise along both sides of the roadway.
The Parker truss is a variation of the Pratt truss with a polygonal, or sloped, upper chord. This configuration allowed engineers to span longer distances efficiently by placing greater structural depth near the center of the bridge, where forces were greatest. Parker through trusses were once used for major highway river crossings throughout the United States, but many have been replaced as traffic demands, safety standards, and roadway widths changed.
The Colorado River Bridge is notable for its size and form. Extending more than 400 feet over the Colorado River, the bridge features two approximately 200-foot-long Parker through truss spans. Its rigid-connected steel construction reflects the evolution of truss technology away from earlier pinned connections and toward more rigid, durable connections better suited to twentieth-century highway traffic.
The bridge’s character-defining features include its steel Parker through truss superstructure, rigid connections, polygonal upper chords, and the experience of passing through the steel truss framework. These elements convey both the bridge’s engineering significance and its visual presence as a major river crossing. The bridge’s location over the Colorado River also contributes to its importance as part of western Colorado’s historic transportation landscape.
As part of the Historic Bridges of Colorado preservation effort, the Colorado River Bridge has been identified as a preservation-priority bridge. Its preservation is especially important because large steel through trusses have become increasingly uncommon on active state highway systems. Maintaining such bridges requires careful planning, specialized repair knowledge, and a balance between transportation needs and historic integrity.
The Colorado River Bridge helps represent a key phase in Colorado bridge history: the use of substantial steel trusses to carry highway traffic across major waterways before postwar bridge design shifted increasingly toward girder, concrete, and standardized highway structures. Its continued presence allows travelers to experience a type of bridge that once played a much larger role in Colorado’s road system.
Preserving the Colorado River Bridge ensures that the story of Western Slope transportation remains visible in the landscape. The bridge is more than a crossing; it is a reminder of the engineering decisions, regional routes, and river landscapes that shaped travel through Mesa County and along the Colorado River corridor.
This bridge is one of the 23 preservation-priority bridges featured in Colorado Preservation, Inc.’s Historic Bridges of Colorado listing. View the full Historic Bridges of Colorado overview to learn more about the statewide preservation effort.