National Bridge Inventory: Colorado



  • Of the 8,829 bridges in the state, 481, 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 455 bridges classified as structurally deficient in 2016.
  • The deck area of structurally deficient bridges accounts for 5.2 percent of total deck area on all structures.
  • 61 of the structurally deficient bridges are on the Interstate Highway System. A total of 75.7 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.
  • 387 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 1,298 bridges at an estimated cost of $962.8 million.
  • This compares to 1,402 bridges that needed work in 2016.

County Year Built Daily Crossings Type of Bridge Location
Denver 1964 157,000 Urban Interstate I 70 ML over US6,RR,City St
Denver 1964 146,000 Urban Interstate I 70 ML WBnd over Rock Island RR
Denver 1964 146,000 Urban Interstate I 70 ML WBnd over SH 35 Ml
Denver 1964 146,000 Urban Interstate I 70 ML EBnd over SH 35 Ml
Denver 1971 146,000 Urban Interstate I 225 ML over Goldsmith Gulch
Denver 1960 146,000 Urban Interstate I 70 ML EBnd over Rock Island RR
Jefferson 1967 135,000 Urban Interstate I 70 ML EBnd over SH 391 Ml
Jefferson 1967 135,000 Urban Interstate I 70 ML WBnd over SH 391 Ml
El Paso 1940 130,000 Urban collector Cache LA Poudre St over Monument Creek
Jefferson 1972 116,000 Urban freeway/expressway US 6 ML over SH 121 Ml
Jefferson 1968 116,000 Urban Interstate I 70 ML EBnd over West 32nd Ave
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
Adams 1987 89,000 Urban Interstate I 76 ML EBnd over Clear Creek
Adams 1987 89,000 Urban Interstate I 76 ML WBnd over Clear Creek
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
Denver 1968 82,000 Urban Interstate I 270 ML EBnd over I 70 Ml
Douglas 1964 76,000 Rural Interstate I 25 ML NBnd over County Road
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
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 537 421,427 10,110,912 28 28,993 478,116
Rural arterial 622 339,346 4,033,514 21 8,088 120,390
Rural minor arterial 617 251,685 1,319,393 39 12,570 84,320
Rural major collector 596 207,799 1,012,450 44 7,602 24,152
Rural minor collector 888 219,661 1,682,036 55 9,765 47,301
Rural local road 2,006 354,741 2,035,126 150 28,929 138,753
Urban Interstate 587 955,325 35,783,226 33 97,078 2,546,567
Urban freeway/expressway 421 570,606 16,378,223 11 16,602 361,148
Urban other principal arterial 558 673,425 13,637,391 24 25,634 604,193
Urban minor arterial 497 400,775 5,743,716 21 11,490 213,559
Urban collector 617 399,128 5,879,117 27 10,826 250,680
Urban local road 883 321,058 6,837,977 28 5,851 74,794
Total 8,829 5,114,977 104,453,081 481 263,429 4,943,973
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 286 $290 3,254,258 181,059
Widening & rehabilitation 260 $183 4,279,001 166,391
Rehabilitation 385 $211 3,808,565 190,088
Deck rehabilitation/replacement 48 $45 827,007 41,370
Other structural work 319 $234 4,538,929 213,410
Total 1,298 $963 16,707,760 792,318

About the data:

Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on March 11, 2021. 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 March 11, 2021.

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 2019 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.

32
Compared to 34 in 2019

in the nation in % of structurally deficient bridges

1. West Virginia 21.2%
31. Connecticut 5.7%
32. Colorado 5.4%
33. Kansas 5.3%

28
Compared to 30 in 2019

in the nation in # of structurally deficient bridges

1. Iowa 4,571
27. New Jersey 502
28. Colorado 481
29. Massachusetts 472

25
Compared to 35 in 2019

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 21.0%
24. South Carolina 6.0%
25. Colorado 5.0%
26. Idaho 5.0%
Full State Ranking

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  • Source: Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on March 11, 2021. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections.

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