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

Data updated May 2026

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

Illinois48.2%42.6%9.2%GoodFairPoor (structurally 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.

RI

Rhode Island

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

NE

Nebraska

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

IL

Illinois

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

MA

Massachusetts

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

MO

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

US 24 (3RD ST)

Unknown

Over: CEDAR CREEK & BN RR

1.5M N IL104/BROADWY, Adams, IL

Built 1968 ADT: 75

FAP 502/IL 57/3RD

Unknown

Over: PAYSON ST

.5M S US 24/MAINE ST, Adams, IL

Built 1959 ADT: 175

US 24(EB)/ MAINE S

Unknown

Over: MISS. R./FRONT ST/BN

W EDGE DWNTWN QUINCY, Adams, IL

Built 1930 ADT: 1,550

ILL 96

Unknown

Over: FAI 172

I-72/IL96 INT, Adams, IL

Built 1976 ADT: 7,400

W ST ANTHONY/TR 42

Unknown

Over: I-172

1.8M N IL 96, Adams, IL

Built 1976 ADT: 7,400

CH 5

Unknown

Over: FAI 172

.7MI S I172/IL104, Adams, IL

Built 1976 ADT: 7,400

ILL 104

Unknown

Over: FAI 172

I-172/IL104 INT, Adams, IL

Built 1976 ADT: 8,600

FAS 1604/TR 349

Unknown

Over: FAI 172

1.3MI N I172/IL104, Adams, IL

Built 1976 ADT: 7,350

CH 3 / ELLINGTON R

Unknown

Over: I-172

2.1M S US 24, Adams, IL

Built 1976 ADT: 7,350

TR 551

Unknown

Over: FAI 172

2 MI S I172/IL96, Adams, IL

Built 1981 ADT: 9,750

TR 531A

Unknown

Over: FAI 172

3.6MI N I172/IL57, Adams, IL

Built 1981 ADT: 9,750

TR 114A

Unknown

Over: FAI 172

1MI S I172/IL96, Adams, IL

Built 1981 ADT: 9,750

FAI 172 SB

Unknown

Over: ILL 57

I-172/IL57 INT, Adams, IL

Built 1982 ADT: 4,000

FAI 172 NB

Unknown

Over: ILL 57

I-172/IL57 INT, Adams, IL

Built 1982 ADT: 1,100

TR 597

Unknown

Over: FAI 172

.7MI S I172/IL57, Adams, IL

Built 1982 ADT: 13,100

US 24(WB)/ BROADWA

Unknown

Over: MISS. R/STREETS/BNRR

W EDGE DWNTWN QUINCY, Adams, IL

Built 1986 ADT: 875

OR 79

Unknown

Over: FAI 172

2.2MI S I172/IL57, Adams, IL

Built 1990 ADT: 13,100

I-172 & ILL 336 SB

Unknown

Over: US 24

US 24 & IL 336 JCT, Adams, IL

Built 1994 ADT: 4,350

I-172 & ILL 336 NB

Unknown

Over: US 24

US 24 & IL 336 JCT, Adams, IL

Built 1994 ADT: 4,000

FAP 733

Unknown

Over: ILL 336

0.3 MI E MENDON, Adams, IL

Built 2001 ADT: 5,800

RAILROAD

Unknown

Over: US 24 - FAP 63

1 MI E PALOMA, Adams, IL

Built 1924 ADT: 4,000

B&N RR

Unknown

Over: FAU 7818

FRONT STREET,QUINCY, Adams, IL

Built 1900 ADT: 1,150

RAILROAD

Unknown

Over: N 12TH STREET

N 12TH QUINCY, Adams, IL

Built 1900 ADT: 6,300

RAILROAD

Unknown

Over: ILL 94 FAP 518

1 MI. SO GOLDEN, Adams, IL

Built 1900 ADT: 800

B&N RR

Unknown

Over: CH 3

3 M ENE QUINCY, Adams, IL

Built 1900 ADT: 650

B&N RR

Unknown

Over: CH 0007

CEDAR ST IN QUINCY, Adams, IL

Built 1900 ADT: 600

FAI-57 NB

Unknown

Over: TR-163B

0.3 MI S PULASKI CO, Alexander, IL

Built 1968 ADT: 200

I 57 NB

Unknown

Over: ILL3/US 51-CS 6010A-CNIC

CAIRO INTERCHANGE, Alexander, IL

Built 1978 ADT: 10

I 57 SB

Unknown

Over: ILL3/US 51-CS 6010A-CNIC

CAIRO INTERCHANGE, Alexander, IL

Built 1978 ADT: 10

CNIC

Unknown

Over: FAI 57 & US 51

1 MI. N. OF ILL 3, Alexander, IL

Built 1977 ADT: 13,400

CNIC RR

Unknown

Over: US 51

0.5 MI E I-57, Alexander, IL

Built 1974 ADT: 4,300

ICG RR

Unknown

Over: US 51

1ST OVRHEAD CAIRO, Alexander, IL

Built 1903 ADT: 5,200

ICG RR

Unknown

Over: US 51

2ND OVERHEAD CAIRO, Alexander, IL

Built 1903 ADT: 5,200

PENN CENTRAL

Unknown

Over: US 51

3RD OVERHEAD CAIRO, Alexander, IL

Built 1917 ADT: 5,200

MO PAC RR

Unknown

Over: OLD ILL RTE 3

GALE, Alexander, IL

Built 1900 ADT: 100

UNION PACIFIC RR

Unknown

Over: MISSISSIPPI RV

THEBES, Alexander, IL

Built 1902 ADT: 10

FAI 70 EB

Unknown

Over: PLEASANT MOUND AVE

2.6 MI E ILL 127, Bond, IL

Built 1966 ADT: 250

FAI 70 WB

Unknown

Over: PLEASANT MOUND AVE

2.6 MI E ILL 127, Bond, IL

Built 1966 ADT: 250

US 40 / POKEY ROAD

Unknown

Over: FAI 70 EB & WB

AT POCAHONTAS, Bond, IL

Built 1966 ADT: 26,900

US 40/FAS 779

Unknown

Over: FAI 70 EB & WB

1.6 MI E POCAHONTAS, Bond, IL

Built 1966 ADT: 26,200

US 40 / FAS 1751

Unknown

Over: Main St / FAS 1748

IN SMITHBORO, Bond, IL

Built 1942 ADT: 700

ILL 127

Unknown

Over: FAI 70 EB & WB

0.4 MI S US 40, Bond, IL

Built 1966 ADT: 22,800

MULBERRY GROVE ROA

Unknown

Over: FAI 70 EB & WB

0.2 MI S MULBERRY GR, Bond, IL

Built 1966 ADT: 25,800

MADISON CO LINE RO

Unknown

Over: FAI 70

1.25M N PIERRON, Bond, IL

Built 1965 ADT: 26,900

TR 112-SUGARLOAF R

Unknown

Over: FAI 70

3.2 MI E POCAHONTAS, Bond, IL

Built 1966 ADT: 26,200

DUDLEYVILLE RD-TR1

Unknown

Over: FAI 70

7.9 MI E POCAHONTAS, Bond, IL

Built 1966 ADT: 24,100

SMITHBORO RD-TR 16

Unknown

Over: FAI 70

3.4 MI E ILL 127, Bond, IL

Built 1965 ADT: 22,800

KING ROAD - TR 226

Unknown

Over: FAI 70

4.1 MI E ILL 127, Bond, IL

Built 1966 ADT: 22,800

MILLERSBURG AVENUE

Unknown

Over: FAI 70

5.7 M E POCAHONTAS, Bond, IL

Built 1966 ADT: 24,100

ANDREWS DR.

Unknown

Over: US 40 AND CSX RR

1.00 MI E IL 127, Bond, IL

Built 2011 ADT: 1,450

Showing 1-50 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.

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.