State profile · Near national median SD

Illinois bridge safety

Condition ratings, load ratings, and structural-deficiency data for every public highway bridge in Illinois — drawn straight from the FHWA National Bridge Inventory.

27,743
Public bridges
41.2%
Good condition
7.9%
Poor condition
7.9%
Structurally deficient

Total Bridges

27,743

Public highway bridges in Illinois

Good Condition

41.2%

11,426 bridges rated 7-9

-8.8pp vs 50% benchmark

Poor Condition

7.9%

2,186 bridges rated 0-4

Structurally Deficient

7.9%

2,186 bridges flagged for repair priority

0.9pp vs national avg 7.0%

Illinois vs national bridge condition

Illinois — Good condition share 41.2%
National avg

Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).

Illinois — Structurally deficient share 26.3%
National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.

Condition Distribution

Bridge inventory deck-condition mix — Illinois (FHWA NBI)

Illinois41.185163825109036%36.47046101719353%7.879465090293047%7.879465090293047%GoodFairPoorStructurally Deficient
Bridge inventory deck-condition mix — Illinois (FHWA NBI)

Counties (102)

Adams 325 Alexander 96 Bond 165 Boone 111 Brown 71 Bureau 382 Calhoun 81 Carroll 185 Cass 77 Champaign 743 Christian 323 Clark 232 Clay 171 Clinton 187 Coles 308 Cook 2185 Crawford 196 Cumberland 169 De Witt 197 DeKalb 264 Douglas 234 DuPage 380 Edgar 278 Edwards 79 Effingham 260 Fayette 356 Ford 300 Franklin 323 Fulton 210 Gallatin 82 Greene 166 Grundy 269 Hamilton 164 Hancock 291 Hardin 58 Henderson 144 Henry 331 Iroquois 565 Jackson 235 Jasper 180 Jefferson 270 Jersey 111 Jo Daviess 198 Johnson 120 Kane 354 Kankakee 352 Kendall 133 Knox 321 LaSalle 529 Lake 286 Lawrence 183 Lee 372 Livingston 578 Logan 296 Macon 368 Macoupin 248 Madison 543 Marion 301 Marshall 153 Mason 85 Massac 138 McDonough 210 McHenry 229 McLean 624 Menard 90 Mercer 162 Monroe 130 Montgomery 261 Morgan 241 Moultrie 171 Ogle 377 Peoria 365 Perry 139 Piatt 249 Pike 338 Pope 86 Pulaski 106 Putnam 50 Randolph 155 Richland 147 Rock Island 256 Saline 176 Sangamon 480 Schuyler 121 Scott 96 Shelby 330 St. Clair 502 Stark 89 Stephenson 332 Tazewell 361 Union 192 Vermilion 515 Wabash 88 Warren 202 Washington 232 Wayne 264 White 210 Whiteside 280 Will 674 Williamson 204 Winnebago 475 Woodford 222

Illinois vs nearby ranks

Adjacent states on the structurally deficient leaderboard (lower share = better)

States are ranked by share of bridges flagged structurally deficient — the FHWA classification for any span where deck, superstructure, or substructure carries a condition rating of 4 or below. Lower percentages indicate stronger maintenance funding and inspection follow-through. States here sit immediately above and below Illinois on the same metric.

44

Rhode Island

7.69% top marginal rate
Structure
Progressive
Burden @ $100K
$78

31

Nebraska

7.73% top marginal rate
Structure
Progressive
Burden @ $100K
$15,571
Selected

17

Illinois

7.88% top marginal rate
Structure
Progressive
Burden @ $100K
$27,743

25

Massachusetts

7.96% top marginal rate
Structure
Progressive
Burden @ $100K
$5,314

29

Missouri

8.53% top marginal rate
Structure
Progressive
Burden @ $100K
$24,654

Bridges Needing Most Attention in Illinois

Six lowest-condition bridges in Illinois, ranked by composite NBI rating. Each is inspected at least every 24 months.

FAS 1599

Poor

Over: DRAINAGE CANAL

2.2 MI E MEYER, Adams, IL

Built 1980 Load: 0.6 t ADT: 200

CH 15

Poor

Over: E FK MAZONRIVER

0.05 MI W CH 16, Grundy, IL

Built 1977 Load: 1.0 t ADT: 1,400

MOOSE RD - TR 240

Structurally Deficient

Over: WILSON CREEK

NE-35-T3NR2E, Fulton, IL

Built 1935 Load: 1.3 t ADT: 10

TR 10-B

Structurally Deficient

Over: KING CREEK

W EDGE OF MINERAL, Bureau, IL

Built 1899 Load: 1.6 t ADT: 10

TR-6

Structurally Deficient

Over: DRAINAGE DITCH

3.5 MI NE DIETERICH, Effingham, IL

Built 1909 Load: 1.6 t ADT: 25

TR208K(TWIN BRIDGE

Structurally Deficient

Over: BIG CREEK

NE EDGE MT ZION, Macon, IL

Built 1967 Load: 1.9 t ADT: 375

All Bridges in Illinois

UNION PACIFIC RR

Unknown

Over: MEREDITH DRIVE

E OF BL55 IN SHERMAN, Sangamon, IL

Built 2005 ADT: 2,800

NORFOLK SOUTHERN R

Unknown

Over: SOUTH GRAND AVE

E OF 9TH ST - SPFLD, Sangamon, IL

Built 1940 ADT: 10,100

MUN 6000 (Oak St)

Unknown

Over: UPRR & Elm St

SW edge Williamsvill, Sangamon, IL

Built 2021 ADT: 450

NSRR

Unknown

Over: 5th St

0.45 mi N Stanford, Sangamon, IL

Built 2022 ADT: 12,700

UPRR

Unknown

Over: 6th St

0.56 mi N Stanford, Sangamon, IL

Built 2022 ADT: 13,000

NSRR

Unknown

Over: 6th St

0.56 mi N Stanford, Sangamon, IL

Built 2022 ADT: 13,000

BNSF RR

Unknown

Over: IL 100

.1M N OLD 67 FREDRCK, Schuyler, IL

Built 1934 ADT: 1,100

CB&Q RR

Unknown

Over: TR 175

2.7 M WNW BROWNING, Schuyler, IL

Built 1900 ADT: 50

CB&Q RR

Unknown

Over: TR 251

2.4 M N FREDERICK, Schuyler, IL

Built 1900 ADT: 25

CB&Q RR

Unknown

Over: TR 253

2.2 M N FREDERICK, Schuyler, IL

Built 1900 ADT: 25

CB&Q RR

Unknown

Over: TR 322

2.9 M N FREDERICK, Schuyler, IL

Built 1900 ADT: 25

CB&Q RR

Unknown

Over: TR 324

AT FREDERICK, Schuyler, IL

Built 1900 ADT: 25

CB&Q RR

Unknown

Over: TR 332

2.1 M WNW BROWNING, Schuyler, IL

Built 1900 ADT: 25

OLD US 36

Unknown

Over: FAI 72

WINCHESTER EXIT#52, Scott, IL

Built 1976 ADT: 8,800

TR 128

Unknown

Over: FAI 72

2.1MI E EXIT#52, Scott, IL

Built 1976 ADT: 8,800

CH 14

Unknown

Over: FAI 72

2.5MI W EXIT#52, Scott, IL

Built 1979 ADT: 9,650

TR 42

Unknown

Over: FAI 72

1.3MI E I72/IL100, Scott, IL

Built 1979 ADT: 9,650

FAI 72 EB

Unknown

Over: ILL 100

I-72 &IL 100 INT, Scott, IL

Built 1981 ADT: 1,100

FAI 72 WB

Unknown

Over: ILL 100

I-72 & IL100 INT, Scott, IL

Built 1981 ADT: 1,350

FAI 72 EB

Unknown

Over: TR 55

2.9MI W IL 100 INT, Scott, IL

Built 1986 ADT: 75

FAI 72 WB

Unknown

Over: TR 55

2.9MI W IL 100 INT, Scott, IL

Built 1986 ADT: 75

FAI 72

Unknown

Over: TR 44

1.6MI W I72/100 INT, Scott, IL

Built 1987 ADT: 50

FAS 1656(CH 23)

Unknown

Over: I-57

1 MI N EFF CO LINE, Shelby, IL

Built 1964 ADT: 18,900

SIR RR

Unknown

Over: WASH ST (MS 7300A)

SOUTH OF S SECOND, Shelby, IL

Built 1900 ADT: 200

MOPAC RR

Unknown

Over: TR 222

.5 MI SE SHELBYVILLE, Shelby, IL

Built 1896 ADT: 500

FAI 64 WB

Unknown

Over: ST CLAIR AVE E ST L

ST CLAIR AVE E ST L, St. Clair, IL

Built 1960 ADT: 4,300

FAI 64 WB

Unknown

Over: EB 55 & Ramp to 64EB

W of Exchange Avenue, St. Clair, IL

Built 1962 ADT: 67,300

Ramp to EB I-64

Unknown

Over: I-55 EB mainline

WEST OF EXCHANGE AVE, St. Clair, IL

Built 1962 ADT: 67,300

I-55/64; US 40 WB

Unknown

Over: TRENDLY AVE. E ST L

East of PSC, St. Clair, IL

Built 1965 ADT: 275

I-55/64; US 40 EB

Unknown

Over: TRENDLY AVE E ST L

3RD BR E POP ST BR, St. Clair, IL

Built 1966 ADT: 275

I-55/64; US 40 WB

Unknown

Over: 4TH ST in E ST LOU

WB OVER 4TH ST, St. Clair, IL

Built 1965 ADT: 150

I-55/64; US 40 EB

Unknown

Over: 4TH ST in E ST LOU

EB OVER 4TH ST, St. Clair, IL

Built 1965 ADT: 150

I-55/64; US 40 WB

Unknown

Over: Broadway & Metrolink

E. St. Louis, St. Clair, IL

Built 1965 ADT: 9,600

I-55/64; US 40 EB

Unknown

Over: Broadway & Metrolink

E St. Louis, St. Clair, IL

Built 1965 ADT: 9,600

I-55/64; US 40 EB

Unknown

Over: Missouri Avenue

1/2 mi W 3rd St Exit, St. Clair, IL

Built 1965 ADT: 10

EB 55/MLK EB&WB AP

Unknown

Over: 3RD ST EXIT to EStL

E ST L - 3rd ST EXIT, St. Clair, IL

Built 1961 ADT: 3,900

3RD ST TO EB I-55/

Unknown

Over: RAMPS TO/FROM MLK DR

E ST LOUIS, St. Clair, IL

Built 1961 ADT: 800

I-55 WB; US 40 WB

Unknown

Over: ST CLAIR AVE

W of ESL Tri-level, St. Clair, IL

Built 1960 ADT: 4,300

I-55/64; US 40 EB

Unknown

Over: RAMPS TO/FROM MLK DR

E ST LOUIS, St. Clair, IL

Built 1961 ADT: 800

RAMP TO IL 203 NB

Unknown

Over: DRNG CANAL & I-55/70

0.4 M E E ST LOUIS, St. Clair, IL

Built 1960 ADT: 67,300

ILL 203 NB

Unknown

Over: SB RAMP TO EB 55/70

0.6 M E E ST LOUIS, St. Clair, IL

Built 1960 ADT: 17,200

ILL 203

Unknown

Over: FAI 70

0.5 M N E ST LOUIS, St. Clair, IL

Built 1960 ADT: 50,300

ILL 15

Unknown

Over: ILL 157

1.8 M E JCT ILL 163, St. Clair, IL

Built 1940 ADT: 6,850

ILL 15 WB

Unknown

Over: ILL 158

S BELLEVILLE, St. Clair, IL

Built 1958 ADT: 9,050

ILL 15 EB

Unknown

Over: ILL 158

S BELLEVILLE, St. Clair, IL

Built 1958 ADT: 9,050

ILL 15 WB

Unknown

Over: ILL 159

0.30MI S IL 158&177, St. Clair, IL

Built 1957 ADT: 14,200

ILL 15 EB

Unknown

Over: ILL 159

0.32MI S IL 158&177, St. Clair, IL

Built 1957 ADT: 12,100

ST CLAIR AVENUE

Unknown

Over: I-55/64; US 40 EB

N of Collinsville Av, St. Clair, IL

Built 1961 ADT: 74,500

FRANK SCOTT PKWY W

Unknown

Over: ILL 15

1.5 M E JCT 13, St. Clair, IL

Built 1964 ADT: 20,400

ILL 13

Unknown

Over: ILL 15

SW BELLEVILLE, St. Clair, IL

Built 1959 ADT: 19,700

Showing 3,351-3,400 of 27,743 bridges

Related

All states → | National rankings → | Understanding conditions → | SD bridges explained →
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges Editorial.

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the FHWA National Bridge Inventory (NBI). A "structurally deficient" rating is a repair-priority signal, not a closure or unsafe-to-cross designation. Consult a qualified civil engineer before making decisions based on this data.

Understanding Bridge Conditions

How FHWA rates bridge condition on a 0-9 scale.

Check Your Daily Bridges

How to look up bridge condition data for bridges on your route.

Read our methodology — how this data is sourced, computed, and verified.