The 1913 bridge is an example of construction considered quite advanced for its time.  A Kansas company built it using rivets, rather than pinned connections.

Originally a pile bridge, constructed by the Kansas City Bridge Company in 1900, trusses added by the Pueblo Bridge Company include: a 1902 Pratt through truss, a 1906 Pratt through truss on the south portal, three 1909 long-span Camelback through truss on the north portal, and a 1921 Pratt pony after flooding destroyed the north approach.  

Constructed in a rugged mountain setting over Boulder Creek in 1953, the three span bridge runs for 100 feet, with the main 48-foot span flanked by shorter approach spans.  

The 60-foot long single span concrete rigid frame structure crosses North St. Vrain Creek at the southern edge of Lyons. 

Designed by the Colorado Department of Highways, this rigid-connected, six-panel steel Pratt deck truss was constructed by M.E. Carlson in 1937. 

Constructed by the Denver, South Park and Pacific Railroad in 1881, the Morley Bridge is Colorado’s oldest dateable vehicular truss. 

Completed in 1907, this segmental, reinforced concrete Luten arch over the Arkansas River was constructed by the Pueblo Bridge Company, one of the state’s most prolific builders of concrete bridges.

Completed in 1902 by Kuyes and Work to span Clear Creek on the east side of Idaho Springs, this skewed, pin-connected, five-panel steel Pratt pony truss features wide roadways and cantilevered sidewalks. 

Completed in 1892, this pin/rigid connected, eight-panel Thatcher through truss is significant for its unusual structural style, patented in 1884 by Edwin Thatcher, then Chief Engineer of the Keystone Bridge Company.

Completed over Culebra Creek on the western edge of San Luis in 1911, this segmental, reinforced concrete open spandrel arch is one of the earliest unaltered bridges of this type in Colorado.

Consisting of two 18-foot spans, the steel multiplate arch culvert is faced with local volcanic fieldstone. 

The 1878 flooding of the South Platte River prompted a series of bridge replacements. 

Joined and widened in 1970, the 1951 steel girder ribbed deck arch bridges are rare surviving structures associated with the early development of the Valley Highway, the predecessor to I-25 through the Denver’s central corridor.

Completed in 1948 over Cherry Creek, at the rim of Castlewood Canyon by J.H. and N.M. Monaghan & Associates, the main span of this Colorado Highway Department designed 374-foot long five span bridge runs for 232 feet.

The steel rigid connected Parker through truss structure was constructed over the Colorado River in 1935 by Denver bridge builders A.S. Horner and C.A. Switzer. 

The 1933 steel rigid connected Parker through truss structure was constructed over the Eagle River by Denver bridge builders A.S. Horner and C.A. Switzer.

Completed in 1940, the steel deck arch features steel components from the Minnesota-Moline Power and Implement Company. 

Although now largely collapsed, the 1890 wooden pin-connected, six-panel Howe through truss was an essential span over the Grande (Colorado) River.

Removed from the National Register in 2005.

Constructed over the Eagle River in 1916, the well preserved concrete Luten arch bridge was built by Pueblo Bridge Company, functioning under a patent royalty agreement with Daniel B. Luten.

Reportedly the last bridge by the prolific Pueblo Bridge Company, this 1932 two-ribbed, reinforced concrete, open spandrel deck arch in Fountain Canyon was designed by King Burghardt.

In 1906, the city contracted with local masons to construct this semicircular, stone ashlar filled arch bridge to replace an existing timber structure.  Listed under Highway Bridges in Colorado Multiple Property Submission.

his 1907 bridge is nearly identical to the Canon Avenue Bridge.  Still in service, both are considered excellent examples of rubble arch construction.  Listed under Highway Bridges in Colorado Multiple Property Submission.

The 226-foot long bridge features a 150-foot long steel rigid connected Parker through truss as its main span.  

The steel multiplate structure fabricated by Thompson Manufacturing Company supports two barrel arches, each spanning 15 feet.  Faced with well crafted stonework, including cut stone voussoirs and keystones, the bridge appears as a true stone arch structure.  

This site has been delisted from the National Register but remains on the State Register.

V.B. Humphrey designed this pin-connected, six-panel steel Pratt through truss constructed by Pueblo’s Bullen Bridge Company in 1891.  

Designed for the Royal Gorge Bridge and Amusement Company by George F. Cole, the steel wires, castings, and rolled components for its towers were assembled at the Minnequa plant of Colorado Fuel and Iron in Pueblo. 

Completed in 1894, as one of numerous bridges constructed when the Florence and Cripple Creek Railroad extended its narrow gauge lines up Phantom Canyon into the Cripple Creek gold district, it features a multi-span trestle with a built-up steel deck girder.

The 1921 bridge was designed by the city engineer, A.B. McFall, and constructed by local contractors Shields & Kimmell. 

Removed from the National Register in 2017.

Constructed in 1931, the cantilevered concrete deck girder bridge consisted of seven 46’-spans supported by reinforced concrete abutments and spill-through piers over the Denver & Rio Grande Western Railroad tracks.

Located in a rugged rural setting, the 1934 filled spandrel arch bridge was designed by the Colorado Department of Highways and built by Gordon Construction Company. 

Constructed in 1927, the eight-panel steel Pratt semi-deck truss extended 150’ over the Arkansas River and Denver & Rio Grande Railroad tracks.

Completed in 1900 by the Pueblo Bridge Company, the bridge is representative of the transition from the Howe to the Pratt truss for use as vehicular bridges.

In 1914, the Missouri Valley Bridge and Iron Company secured the contract to construct a bridge across the Colorado River west of Glenwood Springs in order to replace the existing ferry service.  

The bridge includes two different types of spans, the Pennsylvania and the Parker.  Charles G. Sheely completed this pin-connected, steel twelve-panel Pennsylvania and ten-panel Parker through truss in 1909.

Designed in 1926 to cross the Gunnison River by the Colorado Department of Highways, the 125 foot long steel rigid connected Pratt through truss was fabricated by American Bridge Company.  

Designed in 1926 to cross the Gunnison River the Colorado Department of Highways, the 125- foot long steel rigid connected Pratt through truss was fabricated by American Bridge Company.  

Constructed in 1940, the Colorado Department of Highways designed the 123-foot long timber stringer bridge that includes six 20-foot long spans. 

The 1928-29 concrete slab bridge includes seven 19-foot spans.  It crosses Spring Creek on a now lightly traveled portion of US Hwy. 24 that runs parallel to I-70 between Siebert and Vona.

Constructed in 1933, the steel rigid connected camelback pony truss extends for 100 feet across the Big Thompson River.  Designed by the Colorado Department of Highways, fabricated by Midwest Steel & Iron Works, and built by Lawrence Construction Company, the 134-foot long bridge continues to provide an important transportation link along the route to Rocky Mountain National Park. 

Constructed in 1933, the steel rigid connected camelback pony truss extends for 100 feet across the Big Thompson River.  Designed by the Colorado Department of Highways, fabricated by Midwest Steel & Iron Works, and built by Lawrence Construction Company, the 164-foot long bridge continues to provide an important transportation link along the route to Rocky Mountain National Park.

Completed in 1936, the bridge consists of three skewed semicircular arches with multiplates fabricated by the Hardesty Manufacturing Company.  It features rusticated stone facing and grapevined mortar joints, trademarks of Works Progress Administration workmanship in southeastern Colorado.

Extending for 407 feet over the Colorado River, the 1945 steel rigid connected Parker through truss structure features two 200-foot long spans.  The bridge was designed by the Colorado Department of Highways, fabricated by Minneapolis-Moline Power Implement Company, and built by A.S. Horner. 

This three-span, pinned Parker through truss was completed in 1907 and served the main highway south of Fruita until the road was realigned in 1970.

Constructed in 1935, on Colo. Hwy. 149 in the Rio Grande National Forest, it was moved to Mineral County to provide access to the Marshall Park Campground.

Crossing the Dolores River in a remote location just east of Bedrock, the 1952 steel rigid connected Pennsylvania through truss structure’s single span runs for 129 feet.  The bridge was designed by the Colorado Department of Highways, fabricated by Midwest Steel & Iron Works, and built by Gardner Construction Company. 

Charles Sheely’s Colorado Bridge and Construction Company completed this multi-span, reinforced concrete fixed rainbow arch in 1923.  

The South Platte River Bridge is an intact reminder of the historic highway route (variously designated State Highway 8, State Highway 4, U.S. Highway 40 South, and U.S. Highway 24) between Colorado Springs and southern Park County, which was an important transportation corridor long before Euro-American settlement.

In 1887, the Colorado Midland Railroad and the Denver and Rio Grande Railroad raced to be the first to stretch their rail lines to the mining town of Aspen.

Completed in May 1911, the bridge consisted of a 120’ steel through truss designed by Charles G. Sheely.

Designed by the Colorado Department of Highways, fabricated by Burkhardt Steel Company, and constructed by C.L. Hubner Company, the 1949 steel stringer bridge runs for 423 feet across the Arkansas River.

Constructed in 1936 of locally quarried stone by an eight-man Works Progress Administration crew, this filled arch was faced with rusticated stone and features six, 14-foot span, semicircular arches springing from battered piers.

Removed from the register in 2017.

Completed by the Pueblo Bridge Company in 1913, this vehicular bridge over the Arkansas River was supposed to be a steel structure.  The design was changed to a three-span Luten arch when the steel could not be delivered prior to high water in 1913.

Using a design by Robert DuBois, the Pueblo Bridge Company began construction in 1920.

Crossing the St. Charles River west of Pueblo, the 1945 steel rigid connected Parker through truss structure's single span runs for 150 feet.  The bridge was designed by the Colorado Department of Highways, fabricated by Midwest Steel & Iron Works, and built by Frank M. Kenney.

Completed by the Salle Construction Company of Pueblo in 1924, the excavation for its foundations involved the use of a reinforced concrete vault system which was later patented by the contractors. 

The 1924 steel rigid connected Pennsylvania through truss structure’s single span runs for 280 feet.  It was designed for the Colorado Department of Highways by H.S. Crocker, fabricated by Virginia Bridge & Iron Company, and built by Pueblo Bridge & Construction Company.  

The M.J. Patterson Contracting Company of Denver completed this pin-connected, six-panel steel Pratt pony truss in 1901.

Constructed in 1924, for private access to the Sutherland Ranch east of Del Norte, the bridge consists of a rigid-connected, six-panel timber Warren pony truss, with verticals at all panel points, and a log kingpost pony truss approach. 

The bridge was constructed in 1924 to access what was then the Wheeler Ranch east of Del Norte.

Constructed by the American Bridge Company in 1924, this replacement bridge over the Blue River north of Dillon consists of a rigid-connected, eight-panel steel Parker pony truss with buttresses. 

Constructed in 1938, the concrete rigid frame structure is associated with the development of US Hwy. 36, an important tourist and commercial route linking Denver and the eastern plains of Colorado with communities in Kansas and the Midwest. 

Constructed in 1938, this concrete rigid frame structure is associated with the development of US Hwy. 36, an important tourist and commercial route linking Denver and the eastern plains of Colorado with communities in Kansas and the Midwest. 

Constructed over the Little Thompson River by Gardner Brothers in 1938, the bridge is associated with the development of US Hwy. 87 north of Denver.