National Bridge Inventory: Missouri



  • Of the 24,538 bridges in the state, 2,190, or 8.9 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is up from 2,124 bridges classified as structurally deficient in 2016.
  • The deck area of structurally deficient bridges accounts for 8.5 percent of total deck area on all structures.
  • 66 of the structurally deficient bridges are on the Interstate Highway System. A total of 92.5 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.
  • 4,276 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 4,662 bridges at an estimated cost of $1.7 billion.
  • This compares to 4,975 bridges that needed work in 2016.

County Year Built Daily Crossings Type of Bridge Location
St. Louis 1964 196,459 Urban Interstate IS 270 E over CST Conway Rd
St. Louis 1931 128,327 Urban Interstate IS 270 E over Maline Cr
St. Louis 1960 127,382 Urban Interstate IS 270 E over Coldwater Cr
St. Louis 1963 122,789 Urban Interstate IS 55 S over Mississippi Rvr, CST S L
St. Louis 1968 119,208 Urban Interstate IS 170 E over Rvr Des Peres
Clay 1972 115,847 Urban Interstate IS 435 S over Missouri Rvr, CST NE Bir
Clay 1967 115,847 Urban Interstate IS 435 S over Drain Dtch
Jackson 1969 104,955 Urban minor arterial Rt W E over Br Blue Rvr
Jackson 1964 101,288 Urban Interstate IS 435 S over Grave Cr
Platte 1957 90,688 Urban Interstate IS 29 S over Rt Aa
St. Louis 1960 76,435 Urban Interstate IS 270 E over Rt N
St. Louis 1960 70,661 Urban Interstate IS 270 W over Rt N
St. Louis 1961 63,971 Urban Interstate IS 270 E over Rt Ac
Clay 1955 60,089 Urban freeway/expressway US 169 S over Missouri Rvr, CST Fourth
St. Louis 1961 58,488 Urban freeway/expressway Rt D E over US 67
St. Louis 1956 58,121 Urban Interstate IS 64 E over CST Vandeventer Ave, Cst
Platte 1967 53,027 Urban Interstate IS 29 N over CST 56th St
St. Louis 1970 52,252 Urban Interstate IS 44 E over CST Jefferson Ave
Jackson 1960 48,398 Urban Interstate IS 70 W over CST Van Brunt Blvd
St. Louis 1937 45,900 Urban other principal arterial Kingshighway over Metrolink
St. Louis 1961 45,624 Urban Interstate IS 270 W over Rt Ac
Cooper 1960 37,702 Rural Interstate IS 70 E over Missouri Rvr, Katy Trail
St. Louis 1968 36,767 Rural Interstate IS 44 W over Meramec Rvr, South Outer
Jackson 1966 35,379 Urban Interstate IS 435 S over Blue Rvr
St. Charles 1971 34,755 Urban Interstate IS 64 W over IS 70
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 476 534,765 6,152,468 31 58,507 385,902
Rural arterial 1,189 1,143,800 7,345,700 54 58,720 274,571
Rural minor arterial 1,108 679,599 2,937,233 89 68,871 180,540
Rural major collector 3,868 1,370,127 3,517,124 455 180,368 332,960
Rural minor collector 1,009 221,834 349,387 120 30,876 40,828
Rural local road 12,178 1,721,331 974,238 1,171 128,070 86,210
Urban Interstate 905 1,922,006 38,559,351 35 166,903 1,788,468
Urban freeway/expressway 626 958,735 12,857,874 24 71,312 447,188
Urban other principal arterial 479 642,566 8,094,283 22 32,235 410,729
Urban minor arterial 863 829,057 7,641,185 54 66,233 522,232
Urban collector 803 462,941 3,112,342 44 26,425 157,655
Urban local road 1,034 296,849 1,443,329 91 22,917 151,816
Total 24,538 10,783,610 92,984,514 2,190 911,437 4,779,099
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 2,679 $894 3,756,910 777,353
Widening & rehabilitation 1 $1 5,934 1,810
Rehabilitation 1,941 $786 8,402,821 1,031,454
Deck rehabilitation/replacement 0 $0 0 0
Other structural work 41 $8 11,461 10,176
Total 4,662 $1,689 12,177,126 1,820,793

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.

14
Compared to 19 in 2019

in the nation in % of structurally deficient bridges

1. West Virginia 21.2%
13. Massachusetts 9.0%
14. Missouri 8.9%
15. Illinois 8.8%

5
Compared to 5 in 2019

in the nation in # of structurally deficient bridges

1. Iowa 4,571
4. Oklahoma 2,326
5. Missouri 2,190
6. New York 1,702

10
Compared to 9 in 2019

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 21.0%
9. Puerto Rico 10.0%
10. Missouri 9.0%
11. Louisiana 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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