National Bridge Inventory: Missouri



  • The state has identified needed repairs on 4,335 bridges.
  • This compares to 4,620 bridges that needed work in 2021.
  • Over the life of the IIJA, Missouri will receive a total of $523.4 million in bridge formula funds, which will help make needed repairs.
  • Missouri currently has access to $418.7 million of that total, and has committed $102.3 million towards 243 projects as of June 2025.
  • Of the 24,647 bridges in the state, 2,163, or 8.8 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 2,218 bridges classified as structurally deficient in 2021.
  • The deck area of structurally deficient bridges accounts for 7.9 percent of total deck area on all structures.

Top Most Traveled Structurally Deficient Bridges in Missouri

County Year Built Daily Crossings Type of Bridge Location
St. Louis 1964 182,944 Urban Interstate IS 270 E over CST Conway Rd
St. Louis 1965 137,112 Urban Interstate IS 270 E over CST West Port Plaza Dr
St. Louis 1931 111,723 Urban Interstate IS 270 E over Maline Cr
Jackson 1969 104,024 Urban minor arterial Rt W E over Br Blue Rvr
St. Louis 1968 97,246 Urban Interstate IS 170 E over Rvr Des Peres
Jackson 1964 96,753 Urban Interstate IS 435 S over Grave Cr
St. Louis 1985 71,687 Urban Interstate IS 64 W over Co North Forty Dr to Sor
St. Louis 1985 64,631 Urban Interstate IS 64 E over Co North Forty Dr to Sor
St. Louis 1956 59,295 Urban Interstate IS 64 E over CST Vandeventer Ave, Cst
Jackson 1959 57,907 Urban Interstate IS 70 W over Kct RR
Clay 1957 57,469 Urban Interstate IS 29 N over Rp US169S to Is29S, US 1
St. Louis 1937 45,900 Urban other principal arterial Kingshighway over Metrolink
Jackson 1960 45,701 Urban Interstate IS 70 W over CST Van Brunt Blvd
St. Louis 1963 44,800 Urban Interstate IS 55 N over Mo Pac RR
Jackson 1968 42,076 Urban Interstate IS 435 S over UP RR, Kct RR
Platte 1958 38,357 Rural Interstate IS 29 S over Owl Cr
St. Louis 1968 37,539 Rural Interstate IS 44 W over Meramec Rvr, South Outer
St. Louis 1958 37,226 Rural Interstate IS 44 W over Williams Cr
Franklin 1949 36,909 Urban Interstate IS 44 E over Br of Bourbeuse Rv
Jackson 1961 36,578 Urban freeway/expressway US 71 S over Rt W
St. Charles 1971 35,428 Urban Interstate IS 64 W over IS 70
St. Louis 1964 34,244 Urban Interstate IS 64 E over IS 44, CST 4th St, Cst
St. Louis 1961 33,500 Urban minor arterial Lindell-Union over Forest Park Pkwy
Jackson 2001 31,935 Urban Interstate IS 435 N over IS 49, Rp US71S to Is470
Jackson 1979 30,000 Urban local road Arlington St over Rock Cr

Bridge Inventory: Missouri

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 473 544,582 7,031,239 25 30,917 352,199
Rural arterial 1,168 1,152,671 7,672,943 58 79,641 325,245
Rural minor arterial 1,099 664,299 2,889,137 80 54,813 152,464
Rural major collector 3,879 1,392,006 3,757,211 359 169,007 388,876
Rural minor collector 1,007 223,843 368,483 86 23,010 30,394
Rural local road 12,227 1,778,962 1,016,186 1,272 139,854 97,084
Urban Interstate 917 1,943,180 36,541,347 41 169,187 1,520,281
Urban freeway/expressway 654 975,147 13,467,035 25 44,410 385,741
Urban other principal arterial 492 659,361 7,673,725 30 32,887 438,709
Urban minor arterial 891 874,418 7,892,088 47 52,634 478,816
Urban collector 822 461,030 3,163,660 57 40,126 204,950
Urban local road 1,018 294,123 1,325,288 83 26,165 141,529
Total 24,647 10,963,623 92,798,342 2,163 862,651 4,516,288

Proposed Bridge Work

Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 2,293 $1,360 2,910,944 693,361
Widening & rehabilitation 0 $0 0 0
Rehabilitation 2,001 $1,398 10,300,852 1,053,548
Deck rehabilitation/replacement 0 $0 0 0
Other structural work 41 $14 11,593 10,201
Total 4,335 $2,772 13,223,389 1,757,110

About the data:

Data and cost estimates are from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on June 24, 2025. 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 2023 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.

14
Compared to 13 in 2024

in the nation in % of structurally deficient bridges

1. Iowa 19.0%
13. Massachusetts 9.0%
14. Missouri 9.0%
15. New Hampshire 8.0%

4
Compared to 4 in 2024

in the nation in # of structurally deficient bridges

1. Iowa 4,424
3. Illinois 2,563
4. Missouri 2,163
5. New York 1,741

11
Compared to 12 in 2024

in the nation in % of structurally deficient bridge deck area

1. West Virginia 13.0%
10. Wyoming 8.0%
11. Missouri 8.0%
12. Michigan 7.0%
Full State Ranking

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  • Source: Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on June 24, 2025. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections.

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