Burro Canyon Bridge is a historic steel multiplate arch culvert in Las Animas County, Colorado. Built in 1936, the bridge carries SH 12 over Burro Canyon near Madrid and is one of the most distinctive Works Progress Administration-era roadway structures in southeastern Colorado. It was listed in the National Register of Historic Places in 1985 and is one of the preservation-priority bridges identified through the Historic Bridges of Colorado effort. History Colorado identifies the bridge as listed under the Highway Bridges in Colorado Multiple Property Submission.
The bridge was constructed during the Great Depression, when the Works Progress Administration funded and built public works projects across Colorado and the nation. WPA projects provided employment while improving roads, bridges, culverts, public buildings, parks, and other civic infrastructure. In southeastern Colorado, the WPA played an especially important role in bridge construction during the 1930s, when flood damage and rural transportation needs created demand for improved crossings.
Burro Canyon Bridge is significant for its association with the WPA and with Depression-era government work-relief programs. It represents a period when public investment in infrastructure addressed both immediate transportation needs and broader economic hardship. The bridge also reflects the WPA’s ability to combine practical construction with design features that gave even modest roadway structures a strong civic and visual presence.
The bridge is a steel multiplate arch culvert with stone facing. A multiplate arch culvert is formed from curved steel plates bolted together to create an arch-shaped structural system. This approach allowed engineers to assemble strong, efficient drainage and crossing structures from prefabricated components. At Burro Canyon Bridge, the steel arch system is paired with extensive stone masonry, producing a structure that is both technologically significant and visually distinctive.
Burro Canyon Bridge is especially notable for its three skewed semicircular arches. The skewed configuration allows the structure to cross the canyon at an angle rather than at a simple perpendicular alignment. This makes the bridge more complex than a standard straight crossing and gives it a distinctive form. History Colorado identifies the multiplates as fabricated by the Hardesty Manufacturing Company, connecting the bridge to an important prefabricated culvert technology of the period.
The bridge’s Rustic stonework is central to its historic character. Its rusticated stone facing and grapevined mortar joints are characteristic of WPA workmanship in southeastern Colorado. These masonry features transform a utilitarian steel culvert system into a visually memorable historic roadway structure. The stonework helps the bridge relate to its canyon setting and gives the crossing a crafted appearance associated with New Deal-era public works.
Burro Canyon Bridge is significant under National Register Criterion A in the area of Government for its association with the Works Progress Administration. It is also significant under Criterion C in the area of Engineering as one of the first WPA structures in Colorado to use steel multiplate arches, representing an advance in WPA culvert technology. Its character-defining features include the steel multiplate arch culvert with stone veneer, stone masonry abutments, wingwalls, and piers, and integral stone masonry parapet railings.
As part of the Historic Bridges of Colorado preservation effort, Burro Canyon Bridge has been identified as a preservation-priority bridge. CDOT selected the bridge for Group B, recommending development of an individual bridge management plan because it is a notable example of its type. CDOT also recognized the bridge as one of the most aesthetically significant historic bridges in Colorado, an assessment supported by its unusual form and extensive stonework.
Preserving Burro Canyon Bridge requires careful attention to both its engineering system and its masonry design. The steel multiplate arches, stone veneer, stone abutments, wingwalls, piers, and parapet railings all contribute to the bridge’s significance. Maintenance or rehabilitation work must therefore consider structural performance, drainage, roadway safety, and the retention of original materials and craftsmanship.
Burro Canyon Bridge helps broaden the story of Colorado’s historic bridges by showing that culverts and smaller canyon crossings can possess exceptional historical and engineering value. Its significance lies in the combination of WPA history, early steel multiplate arch technology, Rustic masonry, and a dramatic skewed form. The bridge is not only a functional highway crossing, but also a highly visible example of Depression-era public works design.
The continued preservation of Burro Canyon Bridge ensures that this distinctive part of Colorado’s transportation heritage remains visible along SH 12. It stands as a reminder of the craftsmanship, engineering experimentation, and public investment that shaped southeastern Colorado’s road network during the 1930s.
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.