National Bridge Inventory: Wyoming



  • Of the 3,122 bridges in the state, 218, or 7.0 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 319 bridges classified as structurally deficient in 2016.
  • The deck area of structurally deficient bridges accounts for 8.0 percent of total deck area on all structures.
  • 32 of the structurally deficient bridges are on the Interstate Highway System. A total of 78.0 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.
  • 275 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 1,209 bridges at an estimated cost of $560.2 million.
  • This compares to 1,261 bridges that needed work in 2016.

County Year Built Daily Crossings Type of Bridge Location
Teton 1960 17,900 Rural minor arterial Wyo 22 over Snake River
Uinta 1967 15,263 Urban Interstate I-80 EBL over I-80 Bus
Natrona 1969 14,488 Urban other principal arterial Wyo 220 over Bn RR
Laramie 1958 11,346 Urban Interstate I-25 NBL over Cs RR
Sweetwater 1978 11,060 Urban other principal arterial Wyo 530 over I80 Bus/UP RR
Sweetwater 1982 11,060 Urban other principal arterial Wyo 530 over Green River
Laramie 1958 11,010 Urban Interstate I-25 SBL over Cs RR
Laramie 1965 10,698 Rural Interstate I-80 EBL over Wyo 214
Laramie 1966 9,971 Urban Interstate I-80 WBL over Walterscheid Blvd
Laramie 1965 9,971 Urban Interstate I-80 WBL over U-4016
Laramie 1967 9,851 Rural Interstate I-80 EBL over County Road 921
Laramie 1965 9,619 Urban Interstate I-80 EBL over U-4016
Natrona 1969 9,117 Urban Interstate I-25 SBL over Cnw RR
Natrona 1969 9,094 Urban Interstate I-25 NBL over Cnw RR
Natrona 1968 8,584 Urban other principal arterial US 20 over I-25
Campbell 1976 7,693 Rural Interstate I-90 WBL over County Road 3
Natrona 1979 7,554 Urban minor arterial Wyo 254 over Casper Creek
Albany 1965 7,439 Rural Interstate I-80 WBL over County Road 234
Converse 1972 7,331 Rural Interstate I-25 SBL over N Platte River
Converse 1972 7,331 Rural Interstate I-25 SBL over Indian Creek
Uinta 1967 7,209 Urban Interstate I-80 WBL over I-80 Bus
Sweetwater 1967 7,209 Rural Interstate I-80 WBL over Wyo 374
Uinta 1986 7,209 Urban Interstate I-80 WBL over Wyo 150
Uinta 1959 6,200 Rural Interstate I-80 WBL over UP RR
Uinta 1959 6,193 Rural Interstate I-80 EBL over County Road 141
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 758 343,176 3,463,966 22 14,226 119,359
Rural arterial 339 189,625 858,793 11 6,401 18,944
Rural minor arterial 177 76,987 269,550 5 4,718 25,665
Rural major collector 319 132,559 279,218 13 5,071 11,604
Rural minor collector 209 72,728 202,319 23 10,633 18,921
Rural local road 933 181,252 210,880 111 26,942 27,065
Urban Interstate 162 142,453 1,169,026 10 15,360 99,809
Urban freeway/expressway 7 4,910 67,801 0 0 0
Urban other principal arterial 78 89,411 624,550 5 11,383 45,580
Urban minor arterial 41 43,459 107,454 5 4,441 7,870
Urban collector 52 33,473 80,657 5 1,837 1,992
Urban local road 47 14,366 39,774 8 2,016 3,371
Total 3,122 1,324,399 7,373,988 218 103,028 380,180
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 155 $84 121,576 46,857
Widening & rehabilitation 14 $7 15,290 5,945
Rehabilitation 117 $106 376,691 81,505
Deck rehabilitation/replacement 29 $20 57,929 15,301
Other structural work 894 $342 1,040,603 279,374
Total 1,209 $560 1,612,089 428,983

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.

26
Compared to 22 in 2019

in the nation in % of structurally deficient bridges

1. West Virginia 21.2%
25. Montana 7.2%
26. Wyoming 7.0%
27. Wisconsin 6.9%

41
Compared to 41 in 2019

in the nation in # of structurally deficient bridges

1. Iowa 4,571
40. Connecticut 248
41. Wyoming 218
42. New Hampshire 215

13
Compared to 12 in 2019

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 21.0%
12. Pennsylvania 8.0%
13. Wyoming 8.0%
14. Maine 8.0%
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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