The Colorado River Bridge is a historic riveted girder bridge in Mesa County that carries US 6 over the Colorado River. Built in 1949, the bridge represents an important mid-twentieth-century phase of Colorado highway engineering and has been identified as one of the preservation-priority bridges in the Historic Bridges of Colorado effort.
This bridge should be understood within the larger transportation history of the Colorado River corridor. In western Colorado, river crossings were essential to highway development, community connection, agricultural access, and regional travel. The Colorado River shaped the alignment of roads and the location of crossings, making bridges critical infrastructure for the movement of people, goods, and services across the Western Slope.
The US 6 Colorado River Bridge is significant as a riveted girder continuous bridge. Riveted girder bridges were widely used during the first half of the twentieth century for highway crossings that required durability, strength, and efficient construction. In these bridges, steel girders carry the roadway deck, while riveted connections join the steel members into a strong structural system. This construction method reflects an important period before welded steel construction became more common in later bridge design.
As a continuous girder bridge, the US 6 Colorado River Bridge also represents a more advanced structural form than a simple-span girder bridge. Continuous girders extend across multiple supports, distributing loads across more than one span. This made the bridge type useful for longer crossings and heavier highway traffic, particularly as automobile and truck travel expanded in the post-World War II period.
The bridge’s construction date places it within a transitional moment in Colorado transportation history. By the late 1940s, the state highway system was adapting to increased traffic volumes, larger vehicles, and new expectations for regional mobility. At the same time, many bridges still relied on established steel fabrication methods, including riveted construction. The US 6 Colorado River Bridge helps document this bridge-building period before later postwar technologies and standardized highway forms became dominant.
The character-defining features of the US 6 Colorado River Bridge include its riveted steel girder superstructure, continuous multi-span form, and its relationship to the Colorado River crossing. These features convey the bridge’s engineering type and its role as a substantial mid-century highway structure. The riveted construction is especially important because this connection method is no longer used in the same way in modern bridge construction.
As part of the Historic Bridges of Colorado preservation effort, the US 6 Colorado River Bridge has been identified by the Colorado Department of Transportation as a preservation-priority bridge. This designation recognizes the importance of preserving representative examples of Colorado bridge types, including bridges that may appear more utilitarian than large arches or steel trusses but are still historically and technologically significant.
Preserving the US 6 Colorado River Bridge helps maintain a visible connection to the era when riveted steel girder bridges carried major highway routes across rivers and other substantial crossings. It also helps tell the story of western Colorado’s transportation development, where bridges across the Colorado River were central to regional connectivity.
The US 6 Colorado River Bridge is part of a broader collection of priority historic bridges that together represent the evolution of Colorado bridge design from the 1920s through the 1970s. Its preservation helps ensure that mid-century steel girder construction remains part of that story and that Colorado’s historic bridge inventory reflects both dramatic landmark structures and the everyday highway bridges that made statewide travel possible.
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.