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

I-55 NB

Unknown

Over: RAMPS & CH36

FUNKS GROVE SEC 16, McLean, IL

Built 1975 ADT: 75

FAU 6434/CH 34

Unknown

Over: I-55

EAST OF SHIRLEY, McLean, IL

Built 1976 ADT: 21,300

FAU 6431/CH 29

Unknown

Over: I-55

.5 MI N OF TOWANDA, McLean, IL

Built 1974 ADT: 23,800

FAS 472 (CH 12)

Unknown

Over: UPRR & I-55 & Old Rte 66

3 MI NE OF TOWANDA, McLean, IL

Built 1978 ADT: 23,800

TR 83

Unknown

Over: I-55

2 MI SW OF LEXINGTON, McLean, IL

Built 1974 ADT: 23,800

FAS 473 CH 8

Unknown

Over: I-55

1 MI W OF LEXINGTON, McLean, IL

Built 1973 ADT: 23,400

FAS 356 CH 23

Unknown

Over: I-55

1 MI NW OF LEXINGTON, McLean, IL

Built 1973 ADT: 23,400

TR 43

Unknown

Over: UPRR & I-55 & Old Rte 66

2 MI N OF LEXINGTON, McLean, IL

Built 1978 ADT: 2,050

TR 23

Unknown

Over: I-55

1 MI S OF CHENOA, McLean, IL

Built 1972 ADT: 23,400

Union Pacific RR

Unknown

Over: US 51 SB

KINGSLEY ST & ICG, McLean, IL

Built 1978 ADT: 9,700

Union Pacific RR

Unknown

Over: US 51 NB

MAIN ST UNDER ICG RR, McLean, IL

Built 1979 ADT: 11,300

FAP 412 US 51(SB)

Unknown

Over: US 136

0.51 MI W OF OLD 51, McLean, IL

Built 1986 ADT: 6,550

FAP 412 US 51(NB)

Unknown

Over: US 136

0.5 MI W OF OLD 51, McLean, IL

Built 1986 ADT: 6,550

US 150/FAP 676& SP

Unknown

Over: NS Railway & White Oak R

2.9 MI N OF ILL 9, McLean, IL

Built 1987 ADT: 2,750

CH 8 & FAS 473 CH

Unknown

Over: I-39/US 51

1 MI S WOODFORD CO., McLean, IL

Built 1989 ADT: 18,700

I-39/US 51 SB

Unknown

Over: FAS 472 CH 12

4.65 MI N OF I-55, McLean, IL

Built 1989 ADT: 1,750

I-39/US 51 NB

Unknown

Over: FAS 472 CH 12

4.66 MI N OF I-55, McLean, IL

Built 1989 ADT: 1,750

TR 157A

Unknown

Over: I-39/US 51 SUBSTA RD

2.5 MI N OF I-55, McLean, IL

Built 1989 ADT: 17,300

TR#181 (BUSN. 51)

Unknown

Over: I-39/US 51

0.22 MI W OF OLD 51, McLean, IL

Built 1988 ADT: 17,300

I-39 RAMP 816 SB

Unknown

Over: I-55

0.35 MI W OF BUS.51, McLean, IL

Built 1988 ADT: 31,500

I-39 NB

Unknown

Over: I-55 & CD#2284/2287

0.29 MI W OF OLD 51, McLean, IL

Built 1989 ADT: 31,500

I-39 SB

Unknown

Over: NORTHTOWN RD TR 201B

O.53 MI N OF I-55, McLean, IL

Built 1988 ADT: 850

I-39 NB

Unknown

Over: NORTHTOWN RD TR 201B

0.32 MI W OF OLD 51, McLean, IL

Built 1988 ADT: 850

Raab Rd (FAU 6346)

Unknown

Over: I-55 & I-74

3 MI N OF ILL 9, McLean, IL

Built 1990 ADT: 37,700

FAU6383/6371BEICH

Unknown

Over: I-55/I-74

2.5 MI. S I-55& IL 9, McLean, IL

Built 2003 ADT: 43,100

I-55/I-74 NB

Unknown

Over: College Ave(FAU6352)

3.5 MI SW OF RT 51, McLean, IL

Built 1999 ADT: 5,600

I-55/I-74 SB

Unknown

Over: College Ave(FAU6352)

3.5 M SW OF RT 51, McLean, IL

Built 1999 ADT: 5,600

I-55 NB

Unknown

Over: FAU 6405/LINDEN

0.7 MI E OF US 51, McLean, IL

Built 2009 ADT: 5,100

I-55 SB

Unknown

Over: FAU 6405/LINDEN

0.7 MI E OF US 51, McLean, IL

Built 2009 ADT: 5,100

I-55 NB

Unknown

Over: FAP 704

JCT. FAI55 & VET PKW, McLean, IL

Built 2004 ADT: 12,800

I-55 SB

Unknown

Over: FAP 704

NE CORNER NORMAL, McLean, IL

Built 2004 ADT: 12,800

I-55 NBL

Unknown

Over: I-55 BUSN LOOP

NBL OVR 55 BUSN LOOP, McLean, IL

Built 2010 ADT: 4,800

I-55 NBL

Unknown

Over: EB I-74/SW BLOOM.

JCT I-55 & I-74, McLean, IL

Built 2010 ADT: 21,800

I-55 BUSN LOOP NB

Unknown

Over: I-74/SW BLOOMINGTON

55 BUSN LP OV I-74, McLean, IL

Built 2013 ADT: 21,800

I-55 BUSN LOOP SB

Unknown

Over: I-74/SW BLOOMINGTON

55 BUSN LP OV I-74, McLean, IL

Built 2013 ADT: 21,800

I-55 BUSN LOOP NB

Unknown

Over: I-74/SW BLOOMINGTON

55 BUSN LP OV I-74, McLean, IL

Built 2013 ADT: 21,800

I-55 BUSN LOOP SB

Unknown

Over: I-74/SW BLOOMINGTON

55 BUSN LP OV I-74, McLean, IL

Built 2013 ADT: 21,800

SOUTHERN PACIFIC R

Unknown

Over: DIVISION ST

150 FT W OF LEE ST, McLean, IL

Built 1900 ADT: 1,025

SOUTHERN PACIFIC R

Unknown

Over: MARKET ST FAU6359

100 FT W OF MORRIS, McLean, IL

Built 1889 ADT: 8,650

N&W RR

Unknown

Over: STILLWELL ST

0.8 MI E 150 & 55, McLean, IL

Built 1900 ADT: 50

SOUTHERN PACIFIC R

Unknown

Over: OLIVE ST

1.0 MI SW 9 & 51, McLean, IL

Built 1900 ADT: 700

ABANDONED RR

Unknown

Over: WASHNGTN ST FAU 6360

0.4 MI SSE 9 & 150, McLean, IL

Built 1900 ADT: 8,700

SPCSL RR

Unknown

Over: VERNON AVE

VERNON E OF BEUFORT, McLean, IL

Built 1972 ADT: 6,050

SPCSL RR

Unknown

Over: STREET

S OF BEAUFORT, McLean, IL

Built 1900 ADT: 175

SPCSL RR

Unknown

Over: FAU 6340/CH 32

1 MI SW FAI 74-55, McLean, IL

Built 1900 ADT: 850

C&NW RR

Unknown

Over: TR 75

3.7 M SE GREENVIEW, Menard, IL

Built 1912 ADT: 25

FOOT TRAIL

Unknown

Over: OLD IL 97

LINC NEW SALEM ST PK, Menard, IL

Built 1966 ADT: 4,200

Levee Road / MS 56

Unknown

Over: FAI 255

1 mi E OF J.B.BRIDGE, Monroe, IL

Built 1984 ADT: 51,700

IL3NB-255WB Ramp A

Unknown

Over: I 255 NB - Ramp D

NORTH OF COLUMBIA, Monroe, IL

Built 1982 ADT: 51,700

I 255 NB Ramp D

Unknown

Over: 255 SB->IL3 SB Rmp B

NORTH OF COLUMBIA, Monroe, IL

Built 1982 ADT: 35,500

Showing 2,901-2,950 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.