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Colorado

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"Venice on the Creek" Bridge (Denver County, Colorado)
Built ca. 1890 at an unknown location; relocated here in 1923
Through truss bridge over Cherry Creek with buildings inside it.
Open to pedestrians only

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

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
Removed but not replaced

Animas River Footbridge (La Plata County, Colorado)
Abandoned pony truss bridge over Animas River on Abandoned Trail?
Abandoned and partially collapsed

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 Bridge (Lake County, Colorado)
Built 1939
Timber stringer bridge over Arkansas River on Sh 300
Open to traffic

Arkansas River Bridge (old) (Prowers County, Colorado)
Replaced 1967
Lost Bridge over Arkansas River on Us 50
Replaced by new bridge

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 Pipeline Bridge (Fremont County, Colorado)
Through truss bridge over Arkansas River on Pipeline
Don't know

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

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

Beaver Creek Bridge (Washington County, Colorado)
Built 1935
Girder bridge over Beaver Creek on US 36
Open to traffic

Beavertail Mountain Tunnel (Mesa County, Colorado)
Built 1989
Pair of tunnels under Beavertail Mountain on Interstate 70/US 6
Open

Big Gulch Bridge (Moffat County, Colorado)
Built 1958
Concrete tee beam bridge over Big Gulch on Us 40 Ml
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 Bridge #1 (Larimer County, Colorado)
Built 1937
Pony truss bridge over Big Thompson River on US 34
Replaced by a new bridge

Big Thompson Bridge #2 (Larimer County, Colorado)
Built 1937
Pony truss bridge over Big Thompson River on US 34
Replaced by a new bridge

Big Thompson Bridge #3 (Larimer County, Colorado)
Built 1933
Lost pony truss bridge over Big Thompson River on US 34
Replaced by modern bridge

Big Thompson Bridge #4 (Larimer County, Colorado)
Built 1933
Lost pony truss bridge over Big Thompson River on US 34
Replaced by modern bridge

Bike-Ped Bridge (Broomfield County, Colorado)
Built 2000
Steel through arch bridge over W. Flatiron Circle on Zip Line Route
Open to traffic

Black Bridge (Delta County, Colorado)
Built 1911
Through truss bridge over North Fork Gunnison River on CR 4175D near Paonia
Open to traffic

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

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

BNSF - Arkanas River Bridge (Pueblo County, Colorado)
Warren through truss bridge over Arkansas River on BNSF Railway
Open to traffic

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

BNSF - Old Ratan Pass Road Arch (Las Animas County, Colorado)
Stone arch bridge over Old Ratan Pass Road & Ratan Creek on BNSF Railway
Open to traffic

BNSF - Purgatoire River Bridge (Las Animas County, Colorado)
Built 1940
Pony plate girder bridge over Purgatoire River on BNSF Railway
Open to traffic

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

BNSF - US-6 Overpass (Adams County, Colorado)
Built 1941
Steel stringer bridge over US-6 on BNSF Railroad


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

Boulder Creek Bridge (Boulder County, Colorado)
Replaced 1985
Lost Luten arch bridge over Boulder Creek on 17th Street
Replaced by new bridge

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

Brush Creek Bridge (Eagle County, Colorado)
1935
1935 Steel stringer bridge over Brush Creek on US 6
Replaced by a new bridge

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

Busk-Ivanhoe Tunnel (Pitkin County, Colorado)
Built 1891; Converted to highway use 1922; Closed to traffic 1943; Collapsed 1945
Tunnel
Closed

Buttes Bridge (El Paso County, Colorado)
Built 1921; Replaced 1989
Lost Camelback through truss bridge over Fountain Creek on Pueblo Road
Replaced by a new bridge

C&S - Clear Creek Bridge #19 (Jefferson County, Colorado)
Built 1907 replacing a timber bridge; Removed 1941
Lost Pratt through truss bridge over Clear Creek on Colorado & Southern Railway
Removed

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

Castle Creek Bridge (Eagle County, Colorado)
Built 1933
Steel stringer bridge over Castle Creek on US 6
Open to traffic

Castle Rock Lower Bridge (Boulder County, Colorado)
Built ca. 1930; bypassed 1953, but left in place to serve recreational area
Concrete slab bridge over Middle Boulder Creek on Old Boulder Canyon Drive (Co Rd 54A)
Open to traffic; posted for load

Castle Rock Upper Bridge (Boulder County, Colorado)
Built ca. 1930; bypassed 1953, but left in place to serve recreational area
Steel girder/floorbeam bridge over Middle Boulder Creek on Old Boulder Canyon Drive (Co Rd 54A, former CO 119)
Open to traffic; posted for load

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

CDOT - Wansted Street Overpass (Kiowa County, Colorado)
Built 1939
Steel stringer bridge over Us 287 Ml on Cdot Rr
Unknown status