National Bridge Inventory: Wyoming



  • Of the 3,121 bridges in the state, 205, or 6.6 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 257 bridges classified as structurally deficient in 2018.
  • The deck area of structurally deficient bridges accounts for 7.4 percent of total deck area on all structures.
  • 40 of the structurally deficient bridges are on the Interstate Highway System. A total of 74.6 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.
  • 354 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 1,205 bridges at an estimated cost of $569.1 million.
  • This compares to 1,233 bridges that needed work in 2018.

County Year Built Daily Crossings Type of Bridge Location
Laramie 1977 21,476 Urban other principal arterial Wyo 212 over I-80
Teton 1960 17,546 Rural minor arterial Wyo 22 over Snake River
Laramie 1976 13,539 Urban other principal arterial Wyo 212 over Crow Creek
Uinta 1984 13,177 Urban minor arterial I-80 Bus. over Uprr
Laramie 1966 10,825 Urban Interstate I-80 WBL over Walterscheid Blvd
Albany 1962 10,578 Urban Interstate I-80 EBL over Laramie River
Albany 1962 10,528 Urban Interstate I-80 WBL over Laramie River
Teton 1949 10,305 Rural minor arterial Wyo 22 over Fish Creek
Sweetwater 1982 10,258 Urban other principal arterial Wyo 530 SBL over Green River
Sweetwater 1978 10,258 Urban other principal arterial Wyo 530 SBL over UPRR / I-80 Bus
Laramie 1966 9,900 Urban Interstate I-80 EBL over Walterscheid Blvd
Natrona 1956 9,794 Urban Interstate I-25 NBL over North Platte River
Natrona 1960 8,168 Urban other principal arterial Hereford Lane over I-25
Laramie 1935 8,122 Urban minor arterial Ames Avenue over Unnamed Draw
Albany 1965 8,077 Rural Interstate I-80 WBL over Monument Road
Uinta 1986 7,827 Urban Interstate I-80 WBL over Wyo 150
Uinta 1967 7,640 Urban Interstate I-80 EBL over Yellow Creek Road
Sweetwater 1964 7,500 Rural Interstate I-80 EBL over Wyo 377
Natrona 1979 7,341 Urban minor arterial Wyo 254 over Casper Creek
Converse 1971 6,760 Rural Interstate I-25 NBL over BNSF / Irvine Road
Laramie 1965 6,678 Urban minor arterial La Cnty Rd 124-1 over I-80
Sweetwater 1967 6,593 Rural Interstate I-80 WBL over Wyo 374
Carbon 1970 6,250 Rural Interstate I-80 WBL over Cr 402 / Wagon Hound Rd
Carbon 1970 6,250 Rural Interstate I-80 WBL over Rock Creek
Carbon 1970 6,250 Rural Interstate I-80 WBL over Wyo 13
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 756 345,093 3,515,656 32 20,303 145,000
Rural arterial 340 188,693 917,867 6 3,026 11,397
Rural minor arterial 179 76,681 300,321 8 6,524 38,166
Rural major collector 320 132,425 290,339 9 3,968 6,722
Rural minor collector 212 77,188 209,371 22 9,405 16,349
Rural local road 926 180,822 221,898 95 21,885 22,237
Urban Interstate 161 135,242 1,210,396 8 5,732 71,350
Urban freeway/expressway 7 4,883 84,813 0 0 0
Urban other principal arterial 80 90,316 808,242 6 10,300 65,632
Urban minor arterial 41 43,866 214,825 7 13,379 43,449
Urban collector 52 33,413 172,397 5 1,837 8,315
Urban local road 47 14,436 87,514 7 1,303 3,254
Total 3,121 1,323,058 8,033,639 205 97,662 431,871
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 143 $85 125,665 45,564
Widening & rehabilitation 14 $7 19,302 5,945
Rehabilitation 130 $105 467,775 79,342
Deck rehabilitation/replacement 30 $21 123,160 15,537
Other structural work 888 $352 1,267,016 278,413
Total 1,205 $569 2,002,918 424,801

About the data:

Data and cost estimates are from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on February 1, 2023. 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 2021 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.

23
Compared to 20 in 2021

in the nation in % of structurally deficient bridges

1. West Virginia 20.0%
22. New Jersey 7.0%
23. Wyoming 7.0%
24. Mississippi 7.0%

41
Compared to 41 in 2021

in the nation in # of structurally deficient bridges

1. Iowa 4,604
40. Connecticut 225
41. Wyoming 205
42. New Mexico 199

14
Compared to 10 in 2021

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 17.0%
13. Louisiana 8.0%
14. Wyoming 7.0%
15. Connecticut 7.0%
Full State Ranking

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  • Source: Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on February 1, 2023. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections.

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