National Bridge Inventory: Wyoming



  • Of the 3,129 bridges in the state, 257, or 8.2 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 396 bridges classified as structurally deficient in 2014.
  • 45 of the structurally deficient bridges are on the Interstate Highway System.
  • 220 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 1,233 bridges at an estimated cost of $254.8 million.
  • This compares to 1,316 bridges that needed work in 2014.

County Year Built Daily Crossings Type of Bridge Location
Natrona 1969 14,491 Urban other principal arterial Wyo 220 over Bn RR
Teton 1969 13,000 Rural arterial US 26 over Flat Creek
Sweetwater 1978 12,676 Urban other principal arterial Wyo 530 over I80 Bus/UP RR
Natrona 1958 11,137 Urban Interstate I-25 SBL over Wyo 255
Natrona 1958 10,975 Urban Interstate I-25 NBL over Wyo 255
Laramie 1958 10,900 Urban Interstate I-25 NBL over Cs RR
Natrona 1958 10,760 Urban Interstate I-25 NBL over County Road 513
Laramie 1958 10,577 Urban Interstate I-25 SBL over Cs RR
Teton 1960 10,000 Rural minor arterial Wyo 22 over Snake River
Natrona 1969 8,758 Urban Interstate I-25 SBL over Cnw RR
Natrona 1969 8,737 Urban Interstate I-25 NBL over Cnw RR
Natrona 1968 8,586 Urban other principal arterial US 20 over I-25
Natrona 1979 7,556 Urban minor arterial Wyo 254 over Casper Creek
Albany 1965 7,083 Rural Interstate I-80 WBL over County Road 234
Albany 1961 7,020 Rural Interstate I-80 EBL over Unknown
Converse 1972 7,000 Rural Interstate I-25 SBL over N Platte River
Converse 1972 7,000 Rural Interstate I-25 SBL over Indian Creek
Laramie 1959 6,973 Rural Interstate I-80 EBL over UP RR
Laramie 1960 6,890 Rural Interstate I-80 EBL over UP RR
Laramie 1935 6,880 Urban minor arterial Ames Avenue over Unnamed Drainage
Uinta 1967 6,864 Rural Interstate I-80 WBL over Wyo 413
Uinta 1986 6,864 Urban Interstate I-80 WBL over Wyo 150
Laramie 1959 6,854 Rural Interstate I-80 WBL over UP RR
Carbon 1967 6,061 Rural Interstate I-80 EBL over Machinery Pass
Uinta 1959 6,050 Rural Interstate I-80 WBL over UP RR
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 761 345,858 3,172,435 35 20,232 156,828
Rural arterial 339 185,692 820,510 13 7,565 41,621
Rural minor arterial 177 77,019 241,838 2 3,664 11,511
Rural major collector 321 132,193 264,029 16 5,056 12,496
Rural minor collector 211 80,777 230,963 27 11,705 22,752
Rural local road 935 185,133 461,084 127 29,427 60,314
Urban Interstate 164 144,187 1,147,197 10 16,607 84,458
Urban freeway/expressway 7 6,580 74,329 0 0 0
Urban other principal arterial 76 90,730 758,859 6 17,051 43,358
Urban minor arterial 41 43,794 173,604 7 5,457 28,860
Urban collector 51 33,450 144,816 6 2,517 12,608
Urban local road 46 14,131 79,637 8 2,016 8,762
Total 3,129 1,339,545 7,569,301 257 121,296 483,568
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 159 $70 151,606 49,233
Widening & rehabilitation 14 $2 16,117 5,945
Rehabilitation 137 $62 403,328 86,768
Deck rehabilitation/replacement 31 $13 70,686 16,722
Other structural work 892 $108 1,359,505 274,220
Total 1,233 $255 2,001,242 432,889

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.

22
from 16 in 2017

in the nation in % of structurally deficient bridges

1. Rhode Island 23.1%
21. South Carolina 8.5%
22. Wyoming 8.2%
23. New Jersey 8.1%

41
from 38 in 2017

in the nation in # of structurally deficient bridges

1. Iowa 4,675
40. Puerto Rico 273
41. Wyoming 257
42. New Mexico 232
Full State Ranking

  • Source: Bridge data is from the 2018 National Bridge Inventory ASCII files, released by the Federal Highway Administration on March 14, 2019. Note that specific conditions on bridges may have changed as a result of recent work. ARTBA is a non-partisan federation whose primary goal is to aggressively grow and protect transportation infrastructure investment to meet the public and business demand for safe and efficient travel.
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