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Colorado

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11th Avenue Bridge (Denver County, Colorado)
Built 1925; rehabilitated 1984
Two-span concrete arch bridge over Cherry Creek on W. 11th Avenue in Denver
Open to traffic

13th Avenue Bridge (Denver County, Colorado)
Built 1928; rehabilitated 1987
Two-span concrete arch bridge over Cherry Creek on 13th Avenue in Denver
Open to traffic

14th Street Viaduct (Denver County, Colorado)
Built between 1895 and 1898 at a cost of $367,000. Widened 1939, demolished 1988.
Lost Bridge over Railroads, steets, South Platte River on 14th Street in Denver
Removed

20th Street Viaduct (Denver County, Colorado)
Built 1909-11; replaced 1994
Lost through truss and plate girder bridge over South Platte River and railyard on 20th Street in Denver
Replaced by new bridge

23rd Avenue Bridge (Denver County, Colorado)
Built 1952
Concrete rigid frame bridge over I-25 on 23rd Avenue
Open to traffic

Abandoned Animas River Railroad Bridge (La Plata County, Colorado)
Pratt through truss bridge over Animas River on Private road (former RR)
Open to traffic

Adelaide Bridge (Fremont County, Colorado)
Built 1894 on the narrow gauge Florence and Cripple Creek Railroad. Converted to highway use after the railroad was abandoned in 1912.
Steel trestle on Phantom Canyon Road over Eightmile Creek
Open to one-lane traffic on a gravel road

Agate Creek Bridge (Elbert County, Colorado)
Built 1931
Wooden bridge over Agate Creek on US 40
Open to traffic

Alameda Avenue Bridge (Denver County, Colorado)
Built 1958
Concrete rigid frame bridge over I-25 on Alameda Avenue (CO-26)
Open to traffic

Alpine Tunnel (Gunnison County, Colorado)
Built 1880-82 by the Denver, South Park & Pacific Railroad; collapsed and abandoned in 1910
Abandoned tunnel under the Continental Divide on the Denver, South Park & Pacific Railroad, southwest of St. Elmo
Abandoned and partially caved-in

Amity Canal Bridge (Prowers County, Colorado)
Built ca. 1930; replaced 1996
Lost pony truss bridge over Amity Canal on CR 13
Replaced by new bridge

Animas River CR 20 Bridge (San Juan County, Colorado)
Built 1991
Pony truss bridge over Animas River on CR 20
Open to traffic

Animas River Trail Suspension Bridge (La Plata County, Colorado)
Wire suspension bridge over Animas River on Trail
Open to pedestrians only

Anthracite Creek Bridge (Gunnison County, Colorado)
Built 1925; replaced 1993
Lost through truss bridge over Anthracite Creek on CR 12
Replaced by new bridge

Apishapa Arch (Las Animas County, Colorado)
Built 1933-34 by the Civilian Conservation Corps
Stone arch tunnel through a rock dike on FR 415 just east of Cordova Pass
Open to traffic

Apishapa Bridge (Otero County, Colorado)
Built 1918
Two-span closed-spandrel arch bridge over Apishapa River on CR HH.5
Open to traffic

Apple Valley Road Bridge (Boulder County, Colorado)
Built 1991
Through arch bridge over North St. Vrain Creek on Apple Valley Road (CR 71)
Open to traffic

Archuleta County Road 500 Bridge (Archuleta County, Colorado)
Built 1927; rehabilitated 1940
Pony truss bridge over Cat Creek on Archuleta County Road 500
Open to traffic

Arequa Gulch Bridge (Teller County, Colorado)
Built 2001
Massive plate girder bridge over Arequa Gulch on CO 67
Open to traffic

Arkansas River CO 291 Bridge (Chaffee County, Colorado)
Built or reconstructed in 1959
Pony truss bridge over Arkansas River on CO 291 north of Salida
Open to two-lane traffic on a state highway

Arkansas River CR 166 Bridge (Chaffee County, Colorado)
Built 1989
Pony truss bridge over Arkansas River on CR 166 northwest of Salida
Open to traffic

Arkansas River CR 175 Bridge (Chaffee County, Colorado)
Built 1994
Pony truss bridge over Arkansas River on Spiral Drive (CR 175) north of Salida
Open to two-lane traffic on a paved road

Arkansas River CR 371 Bridge (Chaffee County, Colorado)
Built in 1998, replacing a concrete bridge built in 1965
Pony truss bridge over Arkansas River on CR 371 between Buena Vista and Granite
Open to two-lane traffic on a gravel road

Arkansas River CR 47 Bridge (Fremont County, Colorado)
Built ca. 1930; rehabilitated 1960
Pony truss bridge over Arkansas River on CR 47
Open to traffic

Arkansas River Midland Railroad Bridge (Chaffee County, Colorado)
Lost railroad bridge over Arkansas River just off US 24 near Clear Creek Reservoir
Structure removed except for stone piers

Arkansas River Union Pacific @ Dry Columbia Gulch (Chaffee County, Colorado)
Through truss bridge over Arkansas River on Out of Service Union Pacific Railroad
Closed to all traffic

Avondale Bridge (Pueblo County, Colorado)
Built 1913 by the Pueblo Bridge Co.; replaced 2005
Lost three-span closed-spandrel arch bridge over Arkansas River on CR 327 near Avondale
No longer exists

Baca County Road C Bridge (Baca County, Colorado)
Built 1935
Stone culvert over an unnamed creek on County Road C
Open to traffic

Baca County Road DD Bridge (Baca County, Colorado)
Built 1934
Stone culvert over Dry Creek on County Road DD
Open to traffic

Baca County Road G Bridge (Baca County, Colorado)
Built 1935
Stone culvert over a branch of Cimarron River on County Road G
Open to traffic

Baca County Road J Bridge (Baca County, Colorado)
Built 1939
Stone culvert over an unnamed creek on County Road J
Open to traffic

Baca County Road QQ Bridge (Baca County, Colorado)
Built 1936
Plate girder bridge over County Road QQ on the ATSF Railroad
Open to traffic

Badito Bridge (Huerfano County, Colorado)
Built 1911
Luten arch bridge over Huerfano River on CR 616
Open to traffic

Baldwin Creek Bridge (Chaffee County, Colorado)
Built 1950. The stone pier might be from an earlier railroad bridge.
Small wooden bridge with stone pier on CR 162 over Baldwin Creek east of St. Elmo
Open to traffic

Basalt Bridge (Eagle County, Colorado)
Built 1938; replaced 1998
Lost pony truss bridge over Fryingpan River on Business CO 82 in Basalt
Replaced by a new bridge

Baseline Bridge (Adams County, Colorado)
Built 1926 by the Levy Construction Co.; replaced 1989
Lost three-span pony truss bridge over South Platte River on 168th Avenue (Baseline Road) in Brighton
Replaced by modern bridge

Bear Creek Bridge (Baca County, Colorado)
Built 1935; rehabilitated 1960
Four-span stone arch bridge over Bear Creek on CR 45
Closed to all traffic

Beaty Creek Bridge (Baca County, Colorado)
Built 1938
Stone culvert over Beaty Creek on CO 116
Open to traffic

Beaver Creek Bridge (Fremont County, Colorado)
Built 1923
Pony truss bridge over Beaver Creek on CR 120 (formerly CO 120) in Penrose
Open to traffic

Big Sandy Creek Bridge (Cheyenne County, Colorado)
Built 1936
Wooden bridge over Big Sandy Creek on CR 20 (Old US 287)
Open to traffic

Big Sandy Creek Bridge (Lincoln County, Colorado)
Built 1949
Wooden bridge over Big Sandy Creek on CR 2P
Open to traffic

Big Sandy Draw Bridge (Chaffee County, Colorado)
Built 1938
Pony truss bridge over Big Sandy Draw on US 24/US 285 east of Johnson Corner
Open to traffic

Big Sandy Draw CR 302 Bridge (Chaffee County, Colorado)
Built 1922
Tee beam bridge over Big Sandy Draw on CR 302
Open to traffic

Big Thompson No. 1 Bridge (Larimer County, Colorado)
Built 1937
Pony truss bridge over Big Thompson River on US 34
Open to traffic

Big Thompson No. 2 Bridge (Larimer County, Colorado)
Built 1937
Pony truss bridge over Big Thompson River on US 34
Open to traffic

Big Thompson No. 3 Bridge (Larimer County, Colorado)
Built 1933
Lost pony truss bridge over Big Thompson River on US 34
Replaced by modern bridge

Big Thompson No. 4 Bridge (Larimer County, Colorado)
Built 1933
Lost pony truss bridge over Big Thompson River on US 34
Replaced by modern bridge

Black Bridge (Mesa County, Colorado)
Built 1891 by the Kansas City Bridge Co.; damaged by flooding in 1983
Lost through truss bridge over Gunnison River on CR 25.30
Lost

Black Draw Bridge (Crowley County, Colorado)
Built 1932
Wooden bridge over Black Draw on CO 96
Open to traffic

Black Squirrel Creek Bridge (El Paso County, Colorado)
Built 1935; demolished 2012
Lost through truss bridge over Black Squirrel Creek on US 24 near Peyton
Demolished

Black Squirrel Creek Railroad Bridge (El Paso County, Colorado)
Two-span plate girder bridge over Black Squirrel Creek on a former railroad grade next to US 24
Open to pedestrians

Blue River Bridge (Summit County, Colorado)
Built 1938
Steel arch bridge over Blue River on Power Plant Access Road
Open to traffic

Bobtail Road Bridge (Gilpin County, Colorado)
Built 1999
Steel through arch bridge over Bobtail Creek on Bobtail Road in Black Hawk
Open to traffic

Boggs Creek CO 78 Bridge (Pueblo County, Colorado)
Built 1925
Arch bridge over Boggs Creek on CO 78
Open to traffic

Boulder Creek Bridge (Boulder County, Colorado)
Built 1953
Concrete tee beam bridge over Boulder Creek on Sh 119 Ml
Open to traffic

Branch North Butte Creek Bridge (Prowers County, Colorado)
Built 1935
Stone culvert over a branch of North Butte Creek on CR 16
Open to traffic

Branch North Fork Cimarron River Bridge No. 1 (Baca County, Colorado)
Built 1938
Stone culvert over a branch of North Fork Cimarron River on CR 28
Open to traffic

Branch North Fork Cimarron River Bridge No. 2 (Baca County, Colorado)
Built 1935
Stone culvert over a branch of North Fork Cimarron River on CR 28
Open to traffic

Branch Plum Creek Bridge (Baca County, Colorado)
Built 1935
Stone culvert over a branch of Plum Creek on CR 10
Open to traffic

Branch Sand Arroyo Bridge No. 1 (Baca County, Colorado)
Built 1935
Stone culvert over a branch of Sand Arroyo on CR 23
Open to traffic

Branch Sand Arroyo Bridge No. 2 (Baca County, Colorado)
Built 1935
Stone culvert over a branch of Sand Arroyo on CR 23
Open to traffic

Branch Spring Creek CR E Bridge (Kit Carson County, Colorado)
Built 1910
Pony truss bridge over a branch of Spring Creek on CR E
Open to traffic

Branch Two Buttes Creek Bridge (Baca County, Colorado)
Built 1935
Stone culvert over a branch of Two Buttes Creek on CR 11
Open to traffic

Branch West Carrizo Creek Bridge (Baca County, Colorado)
Built 1935
Stone culvert over a branch of West Carrizo Creek on County Road M
Open to traffic

Bridge # 1077 (Park County, Colorado)
See following link: http://www.narrowgauge.org/EOC/html/estabrook-bridge.html
Queenpost pony truss bridge over Platte River on the old Denver South Park and Pacific Railway Line (now a farm road)
Open to traffic, must gain permission because on private property

Broadway Bridge (Denver County, Colorado)
Built 1896; replaced 1988
Lost open-web deck plate girder bridge over Cherry Creek on Broadway Ave. in Denver
Replaced by new bridge

Broadway Viaduct (Denver County, Colorado)
Built 1922
Lost through truss bridge on Broadway Avenue in Denver
No longer exists

Brown's Canyon Bridge (Chaffee County, Colorado)
Built 1908
Two-span concrete deck girder bridge over Arkansas River on CR 191 at Stone Bridge Access Park
Open to traffic, but road only goes to private land

Brown's Park Bridge (Moffat County, Colorado)
Built 1954; rehabilitated 1991
Suspension bridge over Green River on CR 83
Open to traffic

Buffalo Creek Bridge (Baca County, Colorado)
Built 1938
Stone culvert over Buffalo Creek on CO 116
Open to traffic

Burlington Northern Santa Fe RR Bridge (Denver County, Colorado)
Through truss bridge over Cherry Creek on Burlington Northern Santa Fe Railroad
Open to traffic

Burro Canyon Bridge (Las Animas County, Colorado)
Built 1936 by the Works Progress Administration
Three-span stone arch bridge over Burro Canyon on CO 12
Open to traffic

Byers Railroad Bridge (Arapahoe County, Colorado)
Two-span through truss railroad bridge over West Bijou Creek just west of Byers
Unknown status

C&TS Cascade Trestle (Conejos County, Colorado)
Bridge over Cascade Creek on Railroad
Open to traffic

C&TS Continental Divide Trail Overpass (Conejos County, Colorado)
Bridge over Continental Divide Trail on Railroad
Open to traffic

C&TS Ferguson's Trestle (Conejos County, Colorado)
Built 1989 to original specs.
Bridge on Railroad
Open to traffic

C&TS Rio de los Pinos Bridge (Conejos County, Colorado)
Bridge over Rio de los Pinos on Railroad
Open to traffic

Canon Avenue Bridge (El Paso County, Colorado)
Built 1906; rehabilitated 1990
Stone arch bridge over Fountain Creek on Canon Avenue in Manitou Springs
Open to traffic

Carson Blvd. Bridge (El Paso County, Colorado)
Two-span pony truss bridge over Fountain Creek on Carson Blvd. at Security-Widefield in Colorado Springs
Open to pedestrians only

Cat Creek Bridge (Baca County, Colorado)
Built 1939
Stone culvert over Cat Creek on US 160
Open to traffic

Cat Creek Bridge (Prowers County, Colorado)
Built 1936
Stone culvert over Cat Creek on CR 3
Open to traffic

Cat Creek CR 3 Bridge (Prowers County, Colorado)
Built 1936
Small, two-span stone arch bridge over Cat Creek on CR 3
Open to traffic

Chaffee County Road 165 Bridge (Chaffee County, Colorado)
Built 1935; replaced 1995
Lost pony truss bridge over an unnamed draw on CR 165
Replaced by new bridge

Chalk Creek CR 292 Bridge (Chaffee County, Colorado)
Built 1989
Pony truss bridge over Chalk Creek on CR 292 just north of CR 371, near Lake Alpine
Open to two-lane traffic

Cherry Creek Bridge (Douglas County, Colorado)
Built 1948
Open-spandrel arch bridge over Cherry Creek on CO 83
Open to traffic

Cherry Creek Railroad Bridge (Denver County, Colorado)
Built ca. 1890 at an unknown location; relocated here in 1923
Through truss bridge over Cherry Creek on the Colorado & Southern Railroad (now BNSF) in Denver, north of Delgany Street
Unknown status

Chipita Park Road Bridge (El Paso County, Colorado)
Built ca. 1940
Arch bridge over Fountain Creek on Chipita Park Road in Cascade-Chipita Park
Unknown status

Christian Canyon CR 121.0 Bridge (Las Animas County, Colorado)
Built ca. 1920; rehabilitated 1950
Pony truss bridge over Christian Canyon Creek on CR 121.0
Open to traffic

CO 119 Tunnel (Boulder County, Colorado)
Built 1953
Tunnel on CO 119, between Nederland and Boulder
Open to traffic

CO 120 Viaduct (Fremont County, Colorado)
Built 1931
Tee beam bridge over the Union Pacific Railroad on CO 120
Open to traffic

Coaldale Bridges (Fremont County, Colorado)
Old bridge built 1906. The newer bridge was probably relocated here from elsewhere
Pair of through truss bridges over Arkansas River at Coaldale on CR 6 (Hayden Creek Rd.) just north of US 50
Old bridge closed to all traffic; newer bridge open to traffic on a minor gravel road

Coller Wildlife Area Bridge (Mineral County, Colorado)
Built ca. 1930
Pony truss bridge over the Rio Grande on CR 430 just off CO 149 at Coller State Wildlife Area
Open to traffic on a gravel road

Colorado Canal CR 611 Bridge (Pueblo County, Colorado)
Built ca. 1940; rehabilitated 1960
Pony truss bridge over Colorado Canal on Pueblo County Road 611
Open to traffic

Colorado River CO 9 Bridge (Grand County, Colorado)
Built 1939
Lost deck plate girder bridge over Colorado River on CO 9
No longer exists

Commercial Street Bridge (Las Animas County, Colorado)
Built 1905; replaced 1990
Lost two-span Luten arch bridge over Purgatoire River on Commercial Street in Trinidad.
Replaced by new bridge

Conejos River CR 430 Bridge (Conejos County, Colorado)
Built ca. 1960
Wooden bridge over Conejos River on CR 430
Open to traffic

Costilla Crossing Bridge (Conejos County, Colorado)
Built 1892 by the Wrought Iron Bridge Co.; rehabilitated 2006
Two-span Thacher through truss bridge over the Rio Grande on CR G east of Antonito
Open to one-lane traffic

Cottonwood Creek Bridge (Sedgwick County, Colorado)
Built 1922
Concrete bridge over Cottonwood Creek on CR 22.9
Open to local traffic

Coyote Creek Bridge (Yuma County, Colorado)
Built 1948
Wooden bridge over Coyote Creek on CO 59
Open to traffic

Crooked Arroyo Bridge (Otero County, Colorado)
Built ca. 1930; replaced 1999
Lost pony truss bridge over Crooked Arroyo on CR 21
Replaced by new bridge