National Bridge Inventory: Illinois



  • Of the 26,809 bridges in the state, 2,273, or 8.5 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is up from 2,114 bridges classified as structurally deficient in 2014.
  • 167 of the structurally deficient bridges are on the Interstate Highway System.
  • 1,191 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 4,032 bridges at an estimated cost of $4.8 billion.
  • This compares to 4,036 bridges that needed work in 2014.

County Year Built Daily Crossings Type of Bridge Location
Cook 1962 246,500 Urban Interstate I- 90,94 Elev Exp over Stewart Ave to 28 Pl
DuPage 1959 164,000 Urban Interstate I- 55 over Madison St
Cook 1949 158,600 Urban Interstate I- 94, US 41 Edens over Skokie River
Cook 1963 157,100 Urban freeway/expressway IL 53 NB over Kirchoff Rd
Cook 1963 157,100 Urban freeway/expressway IL 53 SB over Kirchoff Rd
DuPage 1970 151,500 Urban Interstate I-290 over Salt Creek
DuPage 1960 147,600 Urban Interstate I- 55 over Lemont Rd
Cook 1962 123,250 Urban Interstate I- 90,94 Elev Loca over Stewart St to 29 St
Cook 1937 123,200 Urban other principal arterial Lake Shore Drive over Main Br Chicago Riv
Cook 1986 111,000 Urban other principal arterial SB-Lsd over Randolph St & Land
Cook 1933 105,700 Urban other principal arterial Lake Shore Drive over Wilson Avenue
Cook 1933 94,800 Urban other principal arterial Lake Shore Drive over Lawrence Ave
St. Clair 1963 94,700 Urban Interstate Poplar Street Bridge
Will 1955 93,400 Urban Interstate I- 55 over Joliet Rd
Cook 1949 82,200 Urban Interstate I- 94 NB Bishop Fo over Little Cal River
Cook 1949 82,200 Urban Interstate I- 94 SB Bishop Fo over Little Cal River
Cook 1976 80,500 Urban other principal arterial US 12,20,45 NB over S&S & Im Cnls&Icg RR
Cook 1975 80,500 Urban other principal arterial US 12,20,45 NB over Santa Fe Dr Et Al
Cook 1964 75,800 Urban Interstate I- 57 NB over I- 80 WB
St. Clair 1980 71,300 Urban Interstate Fai 255 over Ill 163
St. Clair 1980 71,300 Urban Interstate Fai 255 over Norfolk Southern RR
Cook 1964 69,600 Urban Interstate I- 55 EB Stevenson over RR - BNSF
Cook 1964 69,600 Urban Interstate I- 55 WB Stevenson over RR - BNSF
Champaign 1957 63,100 Urban Interstate I-74 over Market St(FAU 7169)
Champaign 1956 63,100 Urban Interstate I-74 over IC RR & Tr 158
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 878 790,876 9,939,950 64 71,222 587,375
Rural arterial 852 545,193 4,177,600 52 41,166 272,950
Rural minor arterial 1,524 754,706 3,997,250 124 95,144 345,700
Rural major collector 3,227 1,048,689 3,194,300 224 100,617 220,950
Rural minor collector 1,423 378,677 700,225 117 31,254 67,025
Rural local road 12,203 2,059,473 1,428,219 986 122,480 108,374
Urban Interstate 1,442 2,951,075 65,824,375 103 312,431 3,509,850
Urban freeway/expressway 216 271,047 6,020,850 16 14,952 639,500
Urban other principal arterial 1,349 2,131,170 29,617,120 147 333,017 3,242,870
Urban minor arterial 1,275 1,281,172 13,134,825 122 162,085 1,397,725
Urban collector 1,073 797,638 5,006,240 142 158,467 794,745
Urban local road 1,347 515,166 1,355,610 176 55,146 160,120
Total 26,809 13,524,885 144,396,564 2,273 1,497,979 11,347,184
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 1,621 $2,703 11,640,194 1,347,447
Widening & rehabilitation 294 $364 4,227,690 356,145
Rehabilitation 1,902 $1,298 13,360,752 1,416,801
Deck rehabilitation/replacement 66 $183 3,916,275 156,450
Other structural work 149 $223 2,108,760 244,520
Total 4,032 $4,771 35,253,671 3,521,362

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.

20
from 22 in 2017

in the nation in % of structurally deficient bridges

1. Rhode Island 23.1%
19. Missouri 8.6%
20. Illinois 8.5%
21. South Carolina 8.5%

4
from 4 in 2017

in the nation in # of structurally deficient bridges

1. Iowa 4,675
3. Oklahoma 2,540
4. Illinois 2,273
5. Missouri 2,116
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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