National Bridge Inventory: Colorado



  • Of the 8,869 bridges in the state, 469, or 5.3 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is up from 448 bridges classified as structurally deficient in 2017.
  • The deck area of structurally deficient bridges accounts for 4.9 percent of total deck area on all structures.
  • 57 of the structurally deficient bridges are on the Interstate Highway System. A total of 75.9 percent of the structurally deficient bridges are not on the National Highway System, which includes the Interstate and other key roads linking major airports, ports, rail and truck terminals.
  • 378 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 1,294 bridges at an estimated cost of $1.1 billion.
  • This compares to 1,335 bridges that needed work in 2017.

County Year Built Daily Crossings Type of Bridge Location
Denver 1964 157,000 Urban Interstate I 70 ML over US6,RR,City Street
Denver 1971 146,000 Urban Interstate I 225 ML over Goldsmith Gulch
Jefferson 1967 135,000 Urban Interstate I 70 ML WBnd over SH 391 Ml
Jefferson 1967 135,000 Urban Interstate I 70 ML EBnd over SH 391 Ml
Jefferson 1968 127,000 Urban Interstate I 70 ML WBnd over SH 72 Ml
Jefferson 1968 116,000 Urban Interstate I 70 ML EBnd over West 32nd Ave
Jefferson 1972 116,000 Urban freeway/expressway US 6 ML over SH 121 Ml
Adams 1969 106,000 Urban Interstate I 270 ML EBnd over South Platte River
Adams 1969 106,000 Urban Interstate I 270 ML WBnd over South Platte River
Adams 1969 106,000 Urban Interstate I 270 ML WBnd over ditch Rd,Burlington Cana
Jefferson 1967 104,000 Urban Interstate I 70 ML over Harlan Street
Adams 1967 93,000 Urban Interstate I 76 ML EBnd over York Street
Jefferson 1982 86,000 Urban Interstate I 76 ML EBnd over Ramp to SH 121 Ml
Jefferson 1980 86,000 Urban Interstate I 76 ML EBnd over Marshall Street
Larimer 1965 86,000 Urban Interstate I 25 ML SBnd over UP RR
Jefferson 1984 86,000 Urban Interstate I 76 ML EBnd over Clear Creek
Larimer 1941 76,350 Urban Interstate I 25 Service Rd over Draw Sr
Douglas 1964 76,000 Rural Interstate I 25 ML NBnd over County Road
Jefferson 1984 75,651 Urban Interstate I 76 ML WBnd over Clear Creek
El Paso 1971 65,000 Urban Interstate I 25 ML NBnd over Academy Blvd
El Paso 1971 65,000 Urban Interstate I 25 ML SBnd over Academy Blvd
Denver 1962 60,000 Urban freeway/expressway SH 35 ML over Sand Creek
Broomfield 1972 58,000 Urban other principal arterial SH 121 ML SBnd over US 287 Ml, RR Spur
Arapahoe 1955 53,000 Urban other principal arterial US 285 ML over Little Dry Creek
Adams 1940 52,000 Urban other principal arterial SH 6 ML over Sand Creek
Type of Bridge Number of Bridges Area of All Bridges
(sq. meters)
Daily Crossings on All Bridges Number of Structurally Deficient Bridges Area of Structurally Deficient Bridges
(sq. meters)
Daily Crossings on Structurally Deficient Bridges
Rural Interstate 536 422,487 10,285,000 27 27,696 514,592
Rural arterial 622 339,339 3,866,963 25 9,123 115,946
Rural minor arterial 619 253,507 1,365,081 42 13,277 88,800
Rural major collector 599 208,201 821,781 45 7,692 31,504
Rural minor collector 887 219,098 820,600 52 8,889 23,022
Rural local road 2,029 366,764 945,862 144 29,592 78,730
Urban Interstate 583 953,784 35,458,941 30 87,492 2,153,951
Urban freeway/expressway 421 576,931 16,355,356 11 16,602 361,966
Urban other principal arterial 557 674,675 13,152,449 22 25,352 568,372
Urban minor arterial 499 402,768 5,525,019 17 8,524 140,851
Urban collector 627 408,977 4,455,946 27 12,703 119,273
Urban local road 890 328,776 3,225,525 27 5,826 79,690
Total 8,869 5,155,307 96,278,523 469 252,768 4,276,697
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 266 $328 2,822,435 171,118
Widening & rehabilitation 260 $203 3,878,143 162,890
Rehabilitation 388 $232 3,439,132 190,490
Deck rehabilitation/replacement 42 $48 577,168 37,942
Other structural work 338 $269 4,385,420 214,398
Total 1,294 $1,079 15,102,298 776,840

About the data:

Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on January 3, 2022. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections. Cost estimates were downloaded by ARTBA on January 3, 2022.

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 2020 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 repair cost estimate is supplied by the bridge owner or the bridge is classified as structurally deficient. Please note that for a few states, the number of bridges needing to be repaired can vary significantly from year to year, and reflects the data entered by the state.

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.

31
Compared to 34 in 2020

in the nation in % of structurally deficient bridges

1. West Virginia 20.4%
30. Connecticut 5.3%
31. Colorado 5.3%
32. Arkansas 5.3%

29
Compared to 30 in 2020

in the nation in # of structurally deficient bridges

1. Iowa 4,504
28. North Dakota 481
29. Colorado 469
30. Florida 459

25
Compared to 35 in 2020

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 19.5%
24. North Dakota 5.1%
25. Colorado 4.9%
26. Arkansas 4.8%
Full State Ranking

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  • Source: Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on January 3, 2022. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections.

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