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

FAI 255 NB

Unknown

Over: HORSESHOE LAKE ROAD

1.2MI W ILL 157, Madison, IL

Built 1987 ADT: 9,650

FAI 255 SB

Unknown

Over: HORSESHOE LAKE ROAD

1.2MI W ILL157, Madison, IL

Built 1987 ADT: 9,650

I-255 SB

Unknown

Over: 162,Abandon UPRR,2 trail

2 mi W of IL 157, Madison, IL

Built 1987 ADT: 5,850

I-255 NB

Unknown

Over: 162,Abandon UPRR,2 trail

2 mi W of IL 157, Madison, IL

Built 1987 ADT: 5,350

I-255 SB Mainline

Unknown

Over: I-270

1.9MI W ILL 157, Madison, IL

Built 1987 ADT: 49,800

UPRR

Unknown

Over: IL 3

1 mi S of IL 140, Madison, IL

Built 1986 ADT: 13,500

Ramp 255NB to 270W

Unknown

Over: I-270

1.8MI W ILL 157, Madison, IL

Built 1987 ADT: 49,800

IL 255 NB

Unknown

Over: Ramp 255NB to 270WB

.20 MI N OF FAI 270, Madison, IL

Built 1994 ADT: 4,800

IL 255 SB

Unknown

Over: Ramp 255NB to 270WB

.20 MI N OF FAI 270, Madison, IL

Built 1994 ADT: 4,800

IL 255 SB CD

Unknown

Over: Ramp 255NB to 270WB

.20 MI N OF FAI 270, Madison, IL

Built 1994 ADT: 4,800

FAI 255 NB

Unknown

Over: COLLINSVILLE RD

.1M SE FARMNT RACETK, Madison, IL

Built 1986 ADT: 10,400

FAI 255 SB

Unknown

Over: COLLINSVILLE RD

.1M SE FARMNT RACETK, Madison, IL

Built 1986 ADT: 10,400

I-255 NB Mainline

Unknown

Over: I-270

1.9 MI W OF IL 157, Madison, IL

Built 1994 ADT: 3,950

255 SB COLLECTOR

Unknown

Over: I-270

1.9 M W OF IL 157, Madison, IL

Built 1994 ADT: 3,550

CHAIN OF ROCKS ROA

Unknown

Over: OVER IL 255 (FAP310)

2 M WEST OF IL 157, Madison, IL

Built 1994 ADT: 3,750

FAI 255 SB

Unknown

Over: RP 1/RDWY B

N OF FAI 55,70;US 40, Madison, IL

Built 1987 ADT: 6,700

US 67

Unknown

Over: ALBY ST

1.42MI S. BELTLINE, Madison, IL

Built 1990 ADT: 4,250

US 67

Unknown

Over: Mississippi Rvr,NSRR,UPR

ALTON RIVERFRONT, Madison, IL

Built 1994 ADT: 375

ILL 157

Unknown

Over: ST LOUIS ROAD

C-VILLE-E OF RAMON'S, Madison, IL

Built 1992 ADT: 5,500

US 40 WB/EB

Unknown

Over: FAI 70

1/2 MI S OF 162, Madison, IL

Built 1996 ADT: 27,400

ILL 159

Unknown

Over: I-55/70

JCT 70-159 S MRYVLLE, Madison, IL

Built 1996 ADT: 45,600

IL 255 NB (FAP310N

Unknown

Over: COMM DR & CTY DITCH

1.25 M N OF I-270, Madison, IL

Built 1994 ADT: 5,500

IL 255 SB (FAP310S

Unknown

Over: COMM DR & CTY DITCH

1.25 M N OF I-270, Madison, IL

Built 1994 ADT: 5,500

IL 255 NB

Unknown

Over: Poag Rd, NSRR

2.5 mi N of I-270, Madison, IL

Built 1995 ADT: 300

IL 255 SB

Unknown

Over: Poag Rd, NSRR

2.5 mi N of I-270, Madison, IL

Built 1995 ADT: 300

IL 255 NB (FAP310N

Unknown

Over: NEW POAG RD/LEVEE RD

2.70 MI NORTH OF 270, Madison, IL

Built 1995 ADT: 5,500

IL 255 SB (FAP310S

Unknown

Over: NEW POAG RD/LEVEE RD

2.70 MI NORTH OF 270, Madison, IL

Built 1995 ADT: 5,500

IL 255 NB (FAP 310

Unknown

Over: WAGON WHEEL ROXANA

.03 W. OF OLD WANDA, Madison, IL

Built 1995 ADT: 800

IL 255 SB (FAP 310

Unknown

Over: WAGON WHEEL ROXANA

.04 W. OF OLD WANDA, Madison, IL

Built 1995 ADT: 800

IL 255 NB (FAP310N

Unknown

Over: MADISON AVE/FAU 8975

1/4 M W OF S.ROXANA, Madison, IL

Built 1995 ADT: 3,950

IL 255 SB (FAP310S

Unknown

Over: MADISON AVE/FAU8975

1/4 MI W S. ROXANA, Madison, IL

Built 1995 ADT: 3,950

IL 255 NB (FAP310N

Unknown

Over: FAP 789 IL 143

IN ROXANNA, Madison, IL

Built 1995 ADT: 11,700

IL 255 SB (FAP310S

Unknown

Over: FAP 789 IL 143

IN ROXANNA, Madison, IL

Built 1995 ADT: 11,700

ROCK HILL RD FAU89

Unknown

Over: FAP 310

S OF 111, Madison, IL

Built 2001 ADT: 23,000

IL 255 NB (FAP 310

Unknown

Over: IL 111

N OF IL 143, Madison, IL

Built 2001 ADT: 10,450

IL 255 SB (FAP 310

Unknown

Over: IL 111

N OF IL 143, Madison, IL

Built 2001 ADT: 9,450

AIRLINE DR FAU 896

Unknown

Over: IL 255 - FAP 310

.95MI SW IL 140, Madison, IL

Built 2005 ADT: 20,200

BENDER AVE TR 88C

Unknown

Over: FAP 310

SOUTH OF 111/140, Madison, IL

Built 2001 ADT: 20,200

IL 255 (FAP 310)

Unknown

Over: IL 140

BETHALTO, Madison, IL

Built 2005 ADT: 14,800

CULP LANE

Unknown

Over: IL 255 - FAP 310

1.57 MI E FOSTERBURG, Madison, IL

Built 2004 ADT: 16,300

IL 255 NB (FAP310N

Unknown

Over: FOSTERBURG RD

2.14MI N OF IL 140, Madison, IL

Built 2004 ADT: 6,300

IL 255 SB (FAP310S

Unknown

Over: FOSTERBURG RD

2.13MI N OF IL 140, Madison, IL

Built 2004 ADT: 6,300

WOOD STATION RD TR

Unknown

Over: IL 255 - FAP 310

1 MILE N OF ALTON, Madison, IL

Built 2005 ADT: 14,900

IL 255 NB (FAP310N

Unknown

Over: FAS 1765 SEMINARY RD

1.5MI S SEILER RD, Madison, IL

Built 2006 ADT: 5,300

IL 255 SB (FAP310S

Unknown

Over: FAS 1765 SEMINARY RD

1.5MI S SEILER RD, Madison, IL

Built 2006 ADT: 5,300

WENZEL RD MSS 6925

Unknown

Over: IL 255 FAP 310

1.1MI NW SEMINARY RD, Madison, IL

Built 2010 ADT: 13,600

IL 255 NB

Unknown

Over: HUMBERT RD (CH 4)

2.8MI W OF SEMINARY, Madison, IL

Built 2012 ADT: 9,150

IL 255 SB

Unknown

Over: HUMBERT RD (CH 4)

2.8MI W OF SEMINARY, Madison, IL

Built 2012 ADT: 9,150

STUTZ LN FAU 9009

Unknown

Over: IL 255 FAP 310

1.6 MI N OF IL 140, Madison, IL

Built 2005 ADT: 16,300

IL 159 NB AND SB

Unknown

Over: FAI 270

INT. OF 159 AND I270, Madison, IL

Built 2001 ADT: 30,200

Showing 2,701-2,750 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.