National Bridge Inventory: Colorado
- Of the 8,786 bridges in the state, 473, or 5.4 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
- This is up from 470 bridges classified as structurally deficient in 2014.
- 51 of the structurally deficient bridges are on the Interstate Highway System.
- 412 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
- The state has identified needed repairs on 1,353 bridges at an estimated cost of $683.3 million.
- This compares to 2,227 bridges that needed work in 2014.
|County||Year Built||Daily Crossings||Type of Bridge||Location|
|Jefferson||1972||112,000||Urban freeway/expressway||US 6 ML over SH 121 Ml|
|Jefferson||1967||90,000||Urban Interstate||I 70 ML over Harlan Street|
|Denver||1964||64,000||Urban Interstate||I 70 ML WBnd over SH 35 Ml|
|Denver||1964||64,000||Urban Interstate||I 70 ML EBnd over SH 35 Ml|
|Denver||1964||64,000||Urban Interstate||I 70 ML WBnd over UP RR|
|Denver||1960||64,000||Urban Interstate||I 70 ML EBnd over UP RR|
|Denver||1962||58,000||Urban freeway/expressway||SH 35 ML over Sand Creek|
|Jefferson||1967||56,000||Urban Interstate||I 70 ML EBnd over SH 391 Ml|
|Jefferson||1967||56,000||Urban Interstate||I 70 ML WBnd over SH 391 Ml|
|Arapahoe||1955||55,000||Urban other principal arterial||US 285 ML over Little Dry Creek|
|Jefferson||1968||53,000||Urban Interstate||I 70 ML WBnd over West 32nd Ave|
|Denver||1942||53,000||Urban other principal arterial||East 40th Avenue over BNSF RR|
|Jefferson||1968||53,000||Urban Interstate||I 70 ML WBnd over West 20th Ave|
|Jefferson||1968||53,000||Urban Interstate||I 70 ML EBnd over West 32nd Ave|
|Adams||1969||45,500||Urban Interstate||I 270 ML WBnd over SH 265 Ml,UP RR,BNSF RR|
|Adams||1969||45,500||Urban Interstate||I 270 ML WBnd over South Platte River|
|Adams||1969||45,500||Urban Interstate||I 270 ML EBnd over South Platte River|
|Adams||1987||43,000||Urban Interstate||I 76 ML EBnd over Clear Creek|
|El Paso||1995||40,000||Urban freeway/expressway||W Frontage Road over Sand Creek|
|Clear Creek||1965||40,000||Rural Interstate||I 70 ML over Clear Creek|
|Adams||1940||40,000||Urban other principal arterial||SH 6 ML over Sand Creek|
|Denver||1968||39,500||Urban Interstate||I 270 ML EBnd over I 70 Ml|
|Adams||1987||33,500||Urban Interstate||I 76 ML WBnd over Clear Creek|
|Jefferson||1969||33,000||Urban Interstate||I 70 ML WBnd over US 40 Ml|
|Douglas||1964||29,500||Rural Interstate||I 25 ML NBnd over County Road|
|Type of Bridge||Number of Bridges||Area of All Bridges
|Daily Crossings on All Bridges||Number of Structurally Deficient Bridges||Area of Structurally Deficient Bridges
|Daily Crossings on Structurally Deficient Bridges|
|Rural minor arterial||673||303,500||1,876,854||50||18,309||123,921|
|Rural major collector||710||271,720||1,394,339||53||13,467||50,095|
|Rural minor collector||1,082||314,335||1,276,624||63||13,958||53,885|
|Rural local road||2,293||456,409||1,342,756||164||30,372||75,181|
|Urban other principal arterial||551||667,131||11,083,706||20||22,316||384,970|
|Urban minor arterial||437||362,938||4,390,317||17||16,874||105,116|
|Urban local road||532||163,303||1,996,974||12||2,342||8,561|
|Type of Work||Number of Bridges||Cost to Repair
|Daily Crossings||Area of Bridges
|Widening & rehabilitation||256||$100||3,058,252||164,439|
|Other structural work||344||$144||3,585,582||229,800|
About the data:
Data from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), released March 15, 2019. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections.
Effective January 1, 2018, FHWA changed the definition of structurally deficient as part of the final rule on highway and bridge performance measures, published May 20, 2017 pursuant to the 2012 federal aid highway bill Moving Ahead for Progress in the 21st Century Act (MAP-21). Two measures that were previously used to classify bridges as structurally deficient are no longer used. This includes bridges where the overall structural evaluation was rated in poor or worse condition, or where the adequacy of waterway openings was insufficient.
The new definition limits the classification to bridges where one of the key structural elements—the deck, superstructure, substructure or culverts, are rated in poor or worse condition. During inspection, the conditions of a variety of bridge elements are rated on a scale of 0 (failed condition) to 9 (excellent condition). A rating of 4 is considered “poor” condition.
Cost estimates have been derived by ARTBA, based on 2017 average bridge replacement costs for structures on and off the National Highway System, published by FHWA. Bridge rehabilitation costs are estimated to be 68 percent of replacement costs. A bridge is considered to need repair if the structure has identified repairs as part of the NBI, a cost estimate is supplied by the bridge owner or the bridge is classified as structurally deficient.
Bridges are classified by FHWA into types based on the functional classification of the roadway on the bridge. Interstates comprise routes officially designated by the Secretary of Transportation. Other principal arterials serve major centers of urban areas or provide mobility through rural areas. Freeways and expressways have directional lanes generally separated by a physical barrier, and access/egress points generally limited to on- and off-ramps. Minor arterials serve smaller areas and are used for trips of moderate length. Collectors funnel traffic from local roads to the arterial network; major collectors have higher speed limits and traffic volumes and are longer in length and spaced at greater intervals, while minor collectors are shorter and provide service to smaller communities. Local roads do not carry through traffic and are intended for short distance travel.
from 38 in 2017
in the nation in % of structurally deficient bridges
from 31 in 2017
in the nation in # of structurally deficient bridges