Name Image Built Listed Location County Type 19th Street Bridge 1888 1985-02-04 Denver 39°45′36″N 105°0′12″W / 39.76000°N 105.00333°W / 39.76000; -105.00333 (19th Street Bridge ) Denver 2-span Pratt Through Truss Alpine Tunnel Historic District 1879, 1881, 1910 1996-04-01 Hancock , Pitkin , Quartz Chaffee , Gunnison Argo Tunnel and Mill 1893 1978-01-31 Idaho Springs Clear Creek Arkansas River Bridge 1937 1985-02-04 Buena Vista 38°48′49″N 106°6′12″W / 38.81361°N 106.10333°W / 38.81361; -106.10333 (Arkansas River Bridge ) Chaffee Pratt Deck Truss Avondale Bridge 1913 1985-02-04 Avondale 38°14′32″N 104°20′54″W / 38.24222°N 104.34833°W / 38.24222; -104.34833 (Avondale Bridge ) Pueblo Luten Arch Big Thompson River Bridge III 2002-10-15 Loveland 40°24′54″N 105°11′42″W / 40.41500°N 105.19500°W / 40.41500; -105.19500 (Big Thompson River Bridge III ) Larimer Camelback pony truss Big Thompson River Bridge IV 2002-10-15 Loveland 40°25′7″N 105°10′47″W / 40.41861°N 105.17972°W / 40.41861; -105.17972 (Big Thompson River Bridge IV ) Larimer Camelback pony truss Black Squirrel Creek Bridge 2002-10-15 Falcon 39°0′12″N 104°30′46″W / 39.00333°N 104.51278°W / 39.00333; -104.51278 (Black Squirrel Creek Bridge ) El Paso Parker through truss Boulder Creek Bridge 1953 2003-03-11 Boulder 40°0′52″N 105°19′12″W / 40.01444°N 105.32000°W / 40.01444; -105.32000 (Boulder Creek Bridge ) Boulder Concrete slab and girder Bridge No. 10/Adelaide Bridge 1894 1985-02-04 Florence 38°34′17″N 105°5′10″W / 38.57139°N 105.08611°W / 38.57139; -105.08611 (Bridge No. 10/Adelaide Bridge ) Fremont Built-up Deck Girder bridge Bridge over Burro Canon 1936 1985-02-04 Madrid 37°7′26″N 104°44′26″W / 37.12389°N 104.74056°W / 37.12389; -104.74056 (Bridge over Burro Canon ) Las Animas Stone Multiplate Deck Arch Bridge over Fountain Creek 1932 1985-02-04 Manitou Springs 38°52′12″N 104°55′30″W / 38.87000°N 104.92500°W / 38.87000; -104.92500 (Bridge over Fountain Creek ) El Paso Open Spandral Deck Arch Browns's Canyon Bridge 1908 2013-07-30 Salida Chaffee Concrete slab and girder Cherry Creek Bridge 2002-10-15 Franktown 39°19′52″N 104°44′2″W / 39.33111°N 104.73389°W / 39.33111; -104.73389 (Cherry Creek Bridge ) Douglas Two-rib open-spandrel arch Colorado River Bridge 2002-10-15 De Beque 39°20′20″N 108°11′36″W / 39.33889°N 108.19333°W / 39.33889; -108.19333 (Colorado River Bridge ) Mesa Parker through truss Costilla Crossing Bridge 1892 1985-02-04 Antonito 37°4′43″N 105°45′22″W / 37.07861°N 105.75611°W / 37.07861; -105.75611 (Costilla Crossing Bridge ) Conejos Thatcher Through Truss Cottonwood Creek Bridge 1923 2001-10-12 Colorado Springs 38°55′43″N 104°48′35″W / 38.92861°N 104.80972°W / 38.92861; -104.80972 (Cottonwood Creek Bridge ) El Paso cantilevered concrete girder D & RG Narrow Gauge Trestle ca. 1880 1976-06-18 Cimarron 38°27′2″N 107°36′8″W / 38.45056°N 107.60222°W / 38.45056; -107.60222 (D & RG Narrow Gauge Trestle ) Montrose Pratt truss Dolores River Bridge 2002-10-15 Bedrock 38°18′38″N 108°53′09″W / 38.31067°N 108.88577°W / 38.31067; -108.88577 (Dolores River Bridge ) Montrose Pennsylvania through truss Dotsero Bridge 2002-10-15 Dotsero 39°38′57″N 107°3′47″W / 39.64917°N 107.06306°W / 39.64917; -107.06306 (Dotsero Bridge ) Eagle Parker through truss Douglas Crossing Bridge 1936 1985-02-04 Granada 37°47′43″N 102°15′20″W / 37.79528°N 102.25556°W / 37.79528; -102.25556 (Douglas Crossing Bridge ) Prowers Stone Ashlar Filled Arch Eagle River Bridge 1933 2002-10-15 Eagle 39°39′36″N 106°48′55″W / 39.66000°N 106.81528°W / 39.66000; -106.81528 (Eagle River Bridge ) Eagle Parker through truss F Street Bridge 1907 1985-02-04 Salida 38°32′16″N 105°59′33″W / 38.53778°N 105.99250°W / 38.53778; -105.99250 (F Street Bridge ) Chaffee Luten Arch Fruita Bridge 1906 1985-02-04 Fruita 39°8′13″N 108°43′50″W / 39.13694°N 108.73056°W / 39.13694; -108.73056 (Fruita Bridge ) Mesa Parker Through Truss Granada Bridge 2002-10-15 Granada 38°5′38″N 102°18′37″W / 38.09389°N 102.31028°W / 38.09389; -102.31028 (Granada Bridge ) Prowers Steel I-beam stringer Great Western Sugar Company Effluent Flume and Bridge 2014-11-14 Fort Collins, Colorado 40°24′42″N 105°02′43″W / 40.41167°N 105.04528°W / 40.41167; -105.04528 (Great Western Sugar Company Effluent Flume and Bridge ) Larimer Suspension bridge Gunnison River Bridge I 2002-10-15 Gunnison 38°31′58″N 106°57′6″W / 38.53278°N 106.95167°W / 38.53278; -106.95167 (Gunnison River Bridge I ) Gunnison Pratt through truss Gunnison River Bridge II 2002-10-15 Gunnison 38°32′2″N 106°56′55″W / 38.53389°N 106.94861°W / 38.53389; -106.94861 (Gunnison River Bridge II ) Gunnison Pratt through truss Gunnison Tunnel 1901, 1909 1979-07-22 Montrose Montrose Irrigation tunnel Hay's Ranch Bridge 1900 1985-02-04 Meeker 40°0′48″N 108°5′32″W / 40.01333°N 108.09222°W / 40.01333; -108.09222 (Hay's Ranch Bridge ) Rio Blanco Pratt Pony Truss Huerfano Bridge 1921 1985-02-04 Boone 38°13′32″N 104°15′39″W / 38.22556°N 104.26083°W / 38.22556; -104.26083 (Huerfano Bridge ) Pueblo Filled Spandrel Arch Labo Del Rio Bridge 1913 1985-06-24 Arboles 37°4′33″N 107°24′17″W / 37.07583°N 107.40472°W / 37.07583; -107.40472 (Labo Del Rio Bridge ) Archuleta Pratt through truss Lebanon and Everett Mine Tunnels ca. 1870 1971-10-07 Silver Plume 39°41′54″N 105°42′47″W / 39.69833°N 105.71306°W / 39.69833; -105.71306 (Lebanon and Everett Mine Tunnels ) Clear Creek Little Fountain Creek Bridge 2002-10-15 Widefield 38°40′36″N 104°50′55″W / 38.67667°N 104.84861°W / 38.67667; -104.84861 (Little Fountain Creek Bridge ) El Paso Steel multiplate arch Little Thompson River Bridge 2002-10-15 Berthoud 40°18′3″N 104°58′44″W / 40.30083°N 104.97889°W / 40.30083; -104.97889 (Little Thompson River Bridge ) Weld Camelback pony truss Main Street Bridge 2002-10-15 Florence 38°23′21″N 105°6′48″W / 38.38917°N 105.11333°W / 38.38917; -105.11333 (Main Street Bridge ) Fremont Spandrel arch Maitland Arroyo Bridge 2002-10-15 Walsenburg 37°39′57″N 104°50′0″W / 37.66583°N 104.83333°W / 37.66583; -104.83333 (Maitland Arroyo Bridge ) Huerfano Timber stringer Manitou Springs Bridges 1906, 1907 1985-06-24 Manitou Springs 38°51′30″N 104°54′57″W / 38.85833°N 104.91583°W / 38.85833; -104.91583 (Manitou Springs Bridges ) El Paso Stone arch Maroon Creek Bridge 1888, 1929 1985-02-04 Aspen 39°11′43″N 106°50′2″W / 39.19528°N 106.83389°W / 39.19528; -106.83389 (Maroon Creek Bridge ) Pitkin Multi-span Trestle Bridge Miner Street Bridge 1901 1985-02-04 Idaho Springs 39°39′40″N 105°30′45″W / 39.66111°N 105.51250°W / 39.66111; -105.51250 (Miner Street Bridge ) Clear Creek Skewed Pratt Pony Truss Morley Bridge 1881 2003-08-14 Romley 38°40′30″N 106°21′51″W / 38.67500°N 106.36417°W / 38.67500; -106.36417 (Morley Bridge ) Chaffee Pratt deck truss North St. Vrain Creek Bridge 2002-10-15 Lyons 40°13′22″N 105°16′17″W / 40.22278°N 105.27139°W / 40.22278; -105.27139 (North St. Vrain Creek Bridge ) Boulder Concrete rigid frame Plum Bush Creek Bridge 2002-10-15 Last Chance 39°44′23″N 103°32′43″W / 39.73972°N 103.54528°W / 39.73972; -103.54528 (Plum Bush Creek Bridge ) Washington Concrete rigid frame Portland Bridge 1926 1985-02-04 Portland 38°23′19″N 105°0′56″W / 38.38861°N 105.01556°W / 38.38861; -105.01556 (Portland Bridge ) Fremont Pratt Semi-deck Truss Prowers Bridge 1902, 1906, 1909 1985-02-04 Prowers 38°5′37″N 102°46′3″W / 38.09361°N 102.76750°W / 38.09361; -102.76750 (Prowers Bridge ) Bent Camelback & Pratt Through Rainbow Arch Bridge 1923 1985-02-04 Fort Morgan 40°16′9″N 103°48′2″W / 40.26917°N 103.80056°W / 40.26917; -103.80056 (Rainbow Arch Bridge ) Morgan Fixed Rainbow (Marsh) Arch Red Cliff Bridge 1940 1985-02-04 Red Cliff 39°30′29″N 106°22′34″W / 39.50806°N 106.37611°W / 39.50806; -106.37611 (Red Cliff Bridge ) Eagle Deck Arch Bridge Rifle Bridge 1909 1985-02-04 Rifle 39°31′41″N 107°46′51″W / 39.52806°N 107.78083°W / 39.52806; -107.78083 (Rifle Bridge ) Garfield Pennsylvania/Parker Truss Rio Grande Railroad Viaduct 1931 2002-10-15 Florence 38°23′10″N 105°4′18″W / 38.38611°N 105.07167°W / 38.38611; -105.07167 (Rio Grande Railroad Viaduct ) Fremont Cantilevered deck girder Rito Seco Creek Culvert 1936 2002-10-15 San Luis 37°12′0″N 105°25′34″W / 37.20000°N 105.42611°W / 37.20000; -105.42611 (Rito Seco Creek Culvert ) Costilla Multiplate arch Rouch Gulch Bridge 1934 2002-11-27 Swissvale 38°28′20″N 105°52′38″W / 38.47222°N 105.87722°W / 38.47222; -105.87722 (Rouch Gulch Bridge ) Fremont Concrete spandrel arch Royal Gorge Bridge and Incline Railway 1929, 1931 1983-09-02 Canon City Fremont Suspension bridge San Luis Bridge 1911 1985-02-04 San Luis 37°11′37″N 105°25′49″W / 37.19361°N 105.43028°W / 37.19361; -105.43028 (San Luis Bridge ) Costilla Open Spandrel Arch San Luis Southern Railway Trestle aka Rattlesnake Trestle 1910 2004-01-06 Blanca 37°23′12″N 105°32′51″W / 37.38667°N 105.54750°W / 37.38667; -105.54750 (San Luis Southern Railway Trestle ) Costilla Railroad Trestle Santa Fe Avenue Bridge 2002-10-15 Pueblo 38°15′15″N 104°36′23″W / 38.25417°N 104.60639°W / 38.25417; -104.60639 (Santa Fe Avenue Bridge ) Pueblo Pennsylvania through truss Satank Bridge 1900 1985-02-04 Carbondale 39°25′2″N 107°13′48″W / 39.41722°N 107.23000°W / 39.41722; -107.23000 (Satank Bridge ) Garfield Pratt Through Truss Sevenmile Bridge 1935, 1981 1985-07-11 Creede 37°47′33″N 106°58′51″W / 37.79250°N 106.98083°W / 37.79250; -106.98083 (Sevenmile Bridge ) Mineral Pratt deck truss Sheely Bridge 1911, 1966 1985-02-04 Aspen 39°11′27″N 106°48′46″W / 39.19083°N 106.81278°W / 39.19083; -106.81278 (Sheely Bridge ) Pitkin Pratt Through Truss Slate Creek Bridge 1924 1985-06-24 Slate Creek 39°47′0″N 106°9′43″W / 39.78333°N 106.16194°W / 39.78333; -106.16194 (Slate Creek Bridge ) Summit Parker Pony truss South Canon Bridge 1914 1985-02-04 Glenwood Springs 39°33′42″N 107°24′23″W / 39.56167°N 107.40639°W / 39.56167; -107.40639 (South Canon Bridge ) Garfield Pennsylvania Through Truss South Platte River Bridge 1920 2018-03-22 Lake George 38°59′11″N 105°21′48″W / 38.98639°N 105.36333°W / 38.98639; -105.36333 (South Platte River Bridge ) Park Standard-plan concrete deck and girder South Platte River Bridges 1951 2002-10-15 Denver 39°44′36″N 105°0′56″W / 39.74333°N 105.01556°W / 39.74333; -105.01556 (South Platte River Bridges ) Denver Girder-ribbed deck arch Spring Creek Bridge 1929 2002-10-15 Vona 39°18′1″N 102°43′41″W / 39.30028°N 102.72806°W / 39.30028; -102.72806 (Spring Creek Bridge ) Kit Carson Concrete Slab St. Charles Bridge 1924 1985-02-04 Pueblo 38°12′3″N 104°32′46″W / 38.20083°N 104.54611°W / 38.20083; -104.54611 (St. Charles Bridge ) Pueblo Filled Spandrel Arch carrying a county road St. Charles River Bridge 1942 2003-10-15 Devine Pueblo Parker through truss carrying U.S. 50. Demolished in 2005 but still listed on the NRHP in 2021. State Bridge 1890 1985-06-24 State Bridge 39°51′29″N 106°38′54″W / 39.85806°N 106.64833°W / 39.85806; -106.64833 (State Bridge ) Eagle Howe truss Sutherland Bridge 1924 1985-02-04 Del Norte 37°39′48.89″N 106°17′47.11″W / 37.6635806°N 106.2964194°W / 37.6635806; -106.2964194 (Sutherland Bridge ) Rio Grande Warren Pony Truss West Plum Bush Creek Bridge 2002-10-15 Last Chance 39°44′23″N 103°36′40″W / 39.73972°N 103.61111°W / 39.73972; -103.61111 (West Plum Bush Creek Bridge ) Washington Concrete rigid frame Wheeler Bridge 1924 1985-02-04 Del Norte 37°39′29″N 106°17′20″W / 37.65806°N 106.28889°W / 37.65806; -106.28889 (Wheeler Bridge ) Rio Grande Howe Pony Truss 14th Street Viaduct 1898 removed 1994-07-22 Denver Denver steel stringer viaduct 20th Street Viaduct 1909 removed 1994-07-22 Denver Denver Deck Girder/Through Truss Avery Bridges 1914 removed 2002-09-16 Hoehne and Aguilar Las Animas Avery pony truss Big Thompson River Bridge I 2002-10-15 removed 2010-11-29 Estes Park 40°22′49″N 105°28′19″W / 40.38028°N 105.47194°W / 40.38028; -105.47194 (Big Thompson River Bridge I ) Larimer Camelback pony truss Big Thompson River Bridge II 2002-10-15 removed 2010-11-29 Estes Park 40°23′22″N 105°27′49″W / 40.38944°N 105.46361°W / 40.38944; -105.46361 (Big Thompson River Bridge II ) Larimer Camelback pony truss Black Bridge 1891 removed 1994-07-22 Grand Junction Mesa Pratt Through Truss Broadway Bridge 1895 removed 1995-02-27 Denver Denver Open-Web Deck Girder Commercial Street Bridge 1905 removed 1994-07-22 Trinidad Las Animas Luten Arch Delta Bridge 1923 removed 1994-07-22 Delta Delta 4-span Parker Through Truss Elson Bridge 1905 removed 2002-09-16 El Moro Las Animas Pratt Through Truss Escalante Canon Bridge 1890, 1908, 1938 removed 1994-07-22 Delta Delta Camelback Through Truss Fourth Street Bridge 1891 1985-02-04 removed 2010-1-14 Canon City 38°26′22″N 105°13′52″W / 38.43944°N 105.23111°W / 38.43944; -105.23111 (Fourth Street Bridge ) Fremont Pratt Through Truss Fifth Street Bridge 1933 removed 1994-07-22 Grand Junction Mesa Parker Through Truss Four Mile Bridge 1900 removed 1994-07-22 Steamboat Springs Routt Pratt Through Truss Hortense Bridge 1880 removed 1997-04-14 Nathrop Chaffee Queenpost Pony Truss Hotchkiss Bridge 1911 removed 1994-07-22 Hotchkiss Delta Camelback Through Truss Howard Bridge 1924 removed 2002-09-16 Howard Fremont Warren Pony Truss Bridge Manzanola Bridge 1911, 1950 removed 1994-07-22 Manzanola Crowley Pennsylvania through truss Masonic Park Bridge 1909, 1933 removed 1994-07-22 South Fork Rio Grande Pratt Through Truss Nepesta Bridge 1905 removed 1994-07-22 Boone Pueblo Pratt Through Truss Roubideau Bridge 1911 removed 1994-07-22 Delta Delta Warren Through Truss Whiskey Creek Trestle 1905 removed 1987-11-25 Rangely Rio Blanco Wolcott Bridge 2002-10-15 removed 2012-3-12 Wolcott 39°42′6″N 106°40′39″W / 39.70167°N 106.67750°W / 39.70167; -106.67750 (Wolcott Bridge ) Eagle Luten arch