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

A & S RR

Unknown

Over: ST CLAIR AVE

.8 W ILL 111, St. Clair, IL

Built 1940 ADT: 5,900

ABANDONED ICG

Unknown

Over: N BELT WEST/FAU 9257

.15 E ILL 13, St. Clair, IL

Built 1900 ADT: 13,900

CSX R.R.

Unknown

Over: ILL 3

1 M NW I-55-70, St. Clair, IL

Built 1938 ADT: 4,300

CSX R.R.

Unknown

Over: ILL 3

1 M NW I-55-70, St. Clair, IL

Built 1938 ADT: 4,300

CSX R.R

Unknown

Over: ILL 3

.5 M NW I-55-70, St. Clair, IL

Built 1938 ADT: 4,300

I.C.& GULF R.R.

Unknown

Over: FAS 848

NEW ATHENS, St. Clair, IL

Built 1928 ADT: 1,200

SOUTHERN RR

Unknown

Over: 8TH ST/ FAU 9217B

E ST LOUIS, St. Clair, IL

Built 1936 ADT: 2,350

A & S RR

Unknown

Over: 8TH ST/ FAU 9217

E ST LOUIS, St. Clair, IL

Built 1918 ADT: 2,350

IC RR

Unknown

Over: 8TH ST/ FAU 9217B

1.3 M S ILL 15, St. Clair, IL

Built 1937 ADT: 2,350

TRRA R.R.

Unknown

Over: STATE ST/ FAU 9182

E.ST.LOUIS, St. Clair, IL

Built 1900 ADT: 6,500

A & S RR

Unknown

Over: 19TH ST/ FAU 9225

E ST LOUIS, St. Clair, IL

Built 1900 ADT: 2,000

RAILROAD

Unknown

Over: SCHOOL ST/ FAU 9209

EAST CARONDELET, St. Clair, IL

Built 1900 ADT: 1,050

B&O RR

Unknown

Over: CH 99

1/2 MI. E. OF O'FALL, St. Clair, IL

Built 1900 ADT: 1,650

FAU 9187A & MET LI

Unknown

Over: MISS RIV/RR/MSS6000

E ST LOUIS, St. Clair, IL

Built 1874 ADT: 700

TRRA&SOUTHERN R.R.

Unknown

Over: BROADWAY/ FAU 9187A

E.ST.LOUIS, St. Clair, IL

Built 1900 ADT: 9,600

TRRA R.R.

Unknown

Over: TRENDLEY/ FAU 9187A

E.ST.LOUIS, St. Clair, IL

Built 1900 ADT: 9,600

METROLINK

Unknown

Over: IL 161

.48MI EAST FAU 9170, St. Clair, IL

Built 2004 ADT: 10,400

METRO LINK

Unknown

Over: LLEWELYN ROAD

N OF IL 161, St. Clair, IL

Built 1999 ADT: 325

METRO LINK

Unknown

Over: DUTCH HOLLOW RD

NEAR IL 161, St. Clair, IL

Built 1999 ADT: 625

METRO LINK

Unknown

Over: ST. CLAIR AVE

.03MI EAST OF 11TH, St. Clair, IL

Built 1999 ADT: 4,500

METRO LINK

Unknown

Over: 79TH ST

0.01 S OF ST. CLAIR, St. Clair, IL

Built 1999 ADT: 2,850

METRO LINK

Unknown

Over: FAI 64&BAUGH AVE

1-64/BAUGH AVE, St. Clair, IL

Built 1999 ADT: 1,025

IC RR

Unknown

Over: ILL 13/ FAU 9251

0.35 M S ILL 157, St. Clair, IL

Built 1930 ADT: 3,250

METRO LINK

Unknown

Over: IL 159

IN SWANSEA, St. Clair, IL

Built 1999 ADT: 12,000

METRO LINK

Unknown

Over: E. MAIN ST.

WEST OF IL 161, St. Clair, IL

Built 1999 ADT: 1,400

METRO LINK

Unknown

Over: CARLYLE AVE

IN BELLEVILLE, St. Clair, IL

Built 1999 ADT: 4,900

METRO LINK

Unknown

Over: MCCLINTOCK AVE

.04 E OF MCKINLEY, St. Clair, IL

Built 1999 ADT: 7,200

METRO LINK

Unknown

Over: GREENMOUNT RD

.68MI SOUTH OF IL161, St. Clair, IL

Built 1999 ADT: 15,600

METRO LINK

Unknown

Over: "B" ST.

.04 E OF N IOWA, St. Clair, IL

Built 1999 ADT: 2,150

METRO LINK

Unknown

Over: FULLERTON ROAD

.50 MI W OF IL 159, St. Clair, IL

Built 1999 ADT: 6,850

TRRA

Unknown

Over: TRENDLEY AV/FAU 9188

05M W MAINON TRENDLE, St. Clair, IL

Built 1890 ADT: 250

CSX RAILROAD

Unknown

Over: MS 6010/MILL STREET

SW EDGE OFSUMMERFL'D, St. Clair, IL

Built 1900 ADT: 50

ILL CENTRAL RR

Unknown

Over: MS 7420A/10TH STREET

BELLEVILLE, St. Clair, IL

Built 1901 ADT: 475

NS RR

Unknown

Over: CATAWBA ST

.10M N OF "E" ST, St. Clair, IL

Built 1899 ADT: 25

HARLEM CENTER RD

Unknown

Over: US20 FREEPORT BYPASS

3 MI W OF IL 26, Stephenson, IL

Built 1987 ADT: 6,150

HENDERSON ROAD-TR2

Unknown

Over: US 20 FREEPORT BYPAS

1 MI EAST IL 26, Stephenson, IL

Built 1985 ADT: 7,300

TOWER ROAD

Unknown

Over: US20 FREEPORT BYPASS

NE OF FREEPORT, Stephenson, IL

Built 2004 ADT: 7,300

US 20 EB FREPRT BY

Unknown

Over: IL 75

NE OF FREEPORT, Stephenson, IL

Built 1986 ADT: 2,800

RIVER ROAD

Unknown

Over: US 20 FREEPORT BYPAS

2 MI NE OF FREEPORT, Stephenson, IL

Built 1984 ADT: 6,800

US 20 EB

Unknown

Over: ILL RT 26

1 MI N FREEPORT, Stephenson, IL

Built 1986 ADT: 12,500

US 20 WB

Unknown

Over: ILL RT 26

1 MI N FREEPORT, Stephenson, IL

Built 1986 ADT: 12,500

US20B WEST BOUND L

Unknown

Over: US20 FREEPORT BYPASS

.3 MI E SPRINGFLD RD, Stephenson, IL

Built 1987 ADT: 6,200

CN RAILROAD

Unknown

Over: ROCK CITY RD (FAS57)

1.5 MI S OF US 20, Stephenson, IL

Built 1901 ADT: 1,100

CN RAILRAOD

Unknown

Over: BOLTON RD (FAS78)

.2 MI S. OF US 20, Stephenson, IL

Built 1901 ADT: 900

CN RR

Unknown

Over: S BROWNS MILL RD

1 MI S US 20, Stephenson, IL

Built 1927 ADT: 100

CN RR

Unknown

Over: E LAMM RD

6 MI E FREEPORT, Stephenson, IL

Built 1900 ADT: 75

CN RR

Unknown

Over: YELLOW CREEK RD

I MI E OF FREEPORT, Stephenson, IL

Built 1922 ADT: 100

I-74

Unknown

Over: ILL RIV, T&P RR

I-74 OVR ILLINOIS R, Tazewell, IL

Built 1958 ADT: 5,200

EB I-74

Unknown

Over: US 150,FARM CR, TP&W RR

.5 MI E OF ILL 116, Tazewell, IL

Built 1959 ADT: 20,300

WB I-74

Unknown

Over: US150,FARM CR, TP&W, NS

.5 MI E OF ILL 116, Tazewell, IL

Built 1959 ADT: 20,300

Showing 3,501-3,550 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.