National Bridge Inventory: Missouri



  • Of the 24,512 bridges in the state, 2,116, or 8.6 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is up from 2,079 bridges classified as structurally deficient in 2014.
  • 72 of the structurally deficient bridges are on the Interstate Highway System.
  • 4,609 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 4,811 bridges at an estimated cost of $1.3 billion.
  • This compares to 5,195 bridges that needed work in 2014.

County Year Built Daily Crossings Type of Bridge Location
St. Louis 1964 198,800 Urban Interstate IS 270 E over CST Conway Rd
St. Louis 1965 157,244 Urban Interstate IS 270 E over UP RR, Fee Fee Cr
St. Louis 1931 131,273 Urban Interstate IS 270 E over Maline Cr
St. Louis 1968 119,236 Urban Interstate IS 170 E over Rvr Des Peres
St. Louis 1969 100,492 Urban Interstate IS 44 E over BNSF RR
Jackson 1964 97,274 Urban Interstate IS 435 S over Grave Cr
Platte 1957 93,299 Urban Interstate IS 29 S over Rt Aa
Clay 1967 84,758 Urban Interstate IS 435 S over Drain Dtch
Clay 1972 81,501 Urban Interstate IS 435 S over Missouri Rvr, CST NE Bir
St. Louis 1960 74,231 Urban Interstate IS 270 W over Rt N
St. Louis 1988 73,917 Urban Interstate IS 64 E over Creve Coeur Cr
St. Louis 1960 71,877 Urban Interstate IS 270 E over Rt N
St. Louis 1988 65,737 Urban Interstate IS 64 W over Creve Coeur Cr
St. Louis 1983 63,946 Urban freeway/expressway Mo 141 S over Meramec Rvr
St. Louis 1961 63,666 Urban Interstate IS 270 E over Rt Ac
St. Louis 1963 57,597 Urban Interstate IS 55 S over Mississippi Rvr, CST Wha
St. Louis 1956 56,395 Urban Interstate IS 64 E over CST Vandeventer Ave, Cst
Platte 1967 52,658 Urban Interstate IS 29 N over CST 56th St
St. Louis 1970 51,926 Urban Interstate IS 44 W over CST Thurman Ave (C
St. Louis 1970 51,926 Urban Interstate IS 44 W over CST 39th St
St. Louis 1964 51,789 Urban Interstate IS 64 W over CST 4th St, CST Broadway
St. Louis 1970 51,327 Urban Interstate IS 44 E over CST Jefferson Ave
St. Louis 1970 50,032 Urban Interstate IS 44 E over CST Thurman Ave (C
St. Louis 1961 47,929 Urban Interstate IS 270 W over Rt Ac
St. Louis 1964 47,180 Urban Interstate IS 64 E over IS 44, CST Tucker Blvd,,
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 478 531,407 6,220,551 28 37,064 350,254
Rural arterial 1,187 1,138,244 6,978,648 45 51,593 239,789
Rural minor arterial 1,143 683,854 2,847,421 74 56,863 139,724
Rural major collector 3,959 1,374,626 3,469,897 485 192,708 313,496
Rural minor collector 1,058 232,458 356,802 140 38,986 44,288
Rural local road 12,045 1,703,354 1,076,793 1,040 116,035 85,044
Urban Interstate 890 1,892,104 36,127,965 44 175,483 2,234,352
Urban freeway/expressway 623 952,566 12,347,685 21 54,275 355,173
Urban other principal arterial 494 634,097 8,177,400 20 46,609 340,997
Urban minor arterial 798 825,166 7,014,747 45 77,693 368,791
Urban collector 761 435,704 3,012,196 65 35,250 243,837
Urban local road 1,076 298,183 1,540,437 109 27,245 153,170
Total 24,512 10,701,764 89,170,542 2,116 909,803 4,868,915
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 2,835 $891 3,338,762 777,455
Widening & rehabilitation 1 $0 4,439 1,810
Rehabilitation 1,938 $419 8,839,626 975,776
Deck rehabilitation/replacement 0 $0 0 0
Other structural work 37 $1 11,699 10,150
Total 4,811 $1,311 12,194,526 1,765,190

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.

19
from 19 in 2017

in the nation in % of structurally deficient bridges

1. Rhode Island 23.1%
18. Nebraska 8.8%
19. Missouri 8.6%
20. Illinois 8.5%

5
from 5 in 2017

in the nation in # of structurally deficient bridges

1. Iowa 4,675
4. Illinois 2,273
5. Missouri 2,116
6. North Carolina 1,871
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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