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

ILL 13 WB

Unknown

Over: Ramp from EB IL 15

SW BELLEVILLE, St. Clair, IL

Built 1959 ADT: 12,100

IL 15 EB

Unknown

Over: IL 13 / Charles St

1.4 M E JCT IL 159, St. Clair, IL

Built 2015 ADT: 450

MISSOURI AV/FAU 91

Unknown

Over: I-55/64; US 40 WB

1/2 mi W 3RD ST EXIT, St. Clair, IL

Built 1965 ADT: 105,300

I-55/64 WB CD "A"

Unknown

Over: UPRR,O2,B,C,H,4 ESL st's

PIER A1 TO ABUT A46, St. Clair, IL

Built 1968 ADT: 58,100

WB CD to TudorAv "

Unknown

Over: G,6th,B,A,C,H,8th,9th,

PIER G12->PIER D36, St. Clair, IL

Built 1969 ADT: 16,700

I-55/64 EB CD "D"

Unknown

Over: UPRR,O2,8th9th10th,Piggo

PIER D1 TO ABUT D46, St. Clair, IL

Built 1969 ADT: 23,900

IL3NB TO 55/64WB "

Unknown

Over: UPRR,A,B,C,IL 3 SB Ramp,

PIER P1 TO PIER A5, St. Clair, IL

Built 1969 ADT: 58,100

PiggotAv to EB CD"

Unknown

Over: Abandoned Southern RR,8t

PIER A35 TO ABUT T6, St. Clair, IL

Built 1969 ADT: 2,350

FAI 64 EB

Unknown

Over: 18TH ST

0.23 E OF 15TH ST., St. Clair, IL

Built 1968 ADT: 2,800

FAI 64 WB

Unknown

Over: 18TH ST

0.22 E OF 18TH ST, St. Clair, IL

Built 1974 ADT: 2,800

FAI 64 EB

Unknown

Over: 25TH STREET

0.49 E OF BAUGH AVE, St. Clair, IL

Built 1973 ADT: 7,450

FAI 64 WB

Unknown

Over: 25TH ST

0.50 E OF BAUGH AVE, St. Clair, IL

Built 1974 ADT: 7,450

FAI 64 EB

Unknown

Over: 37TH ST

1 M W ILL 111, St. Clair, IL

Built 1968 ADT: 2,700

FAI 64 WB

Unknown

Over: 37TH ST

1 M W ILL 111, St. Clair, IL

Built 1968 ADT: 2,700

ILL 111

Unknown

Over: FAI 64

.39 M N ST CLAIR AVE, St. Clair, IL

Built 1973 ADT: 66,300

BUNKUM RD/ FAU 916

Unknown

Over: FAI 64

1.99 MI E ILL 157, St. Clair, IL

Built 1971 ADT: 83,000

RUBY LANE/ FAU 932

Unknown

Over: FAI 64

0.57 MI W OF ILL 159, St. Clair, IL

Built 1970 ADT: 83,000

ILL 159

Unknown

Over: FAI 64

0.57 MI E RUBY LANE, St. Clair, IL

Built 1971 ADT: 78,800

OLD US 50

Unknown

Over: FAI 64

2.31 MI E OF ILL 159, St. Clair, IL

Built 1972 ADT: 61,500

S Lincoln Ave

Unknown

Over: FAI-64

3.74 MI S OF US-50, St. Clair, IL

Built 1971 ADT: 58,600

N Main St / FAU 92

Unknown

Over: FAI 64

1/2 mi S of US 50, St. Clair, IL

Built 1972 ADT: 58,600

ILL 158 SB

Unknown

Over: FAI 64

0.58 MI NE OF SHILOH, St. Clair, IL

Built 1973 ADT: 58,600

ILL 158 NB

Unknown

Over: FAI 64

0.58 MI NE OF SHILOH, St. Clair, IL

Built 1973 ADT: 42,900

SUMMRFIELD Rd-FAS8

Unknown

Over: FAI-64

3 M E ILL 4, St. Clair, IL

Built 1967 ADT: 34,900

FAI 64 EB

Unknown

Over: ILL 161

1.5 MI W NEW BADEN, St. Clair, IL

Built 1972 ADT: 3,200

FAI 64 WB

Unknown

Over: ILL 161

1.5 MI W NEW BADEN, St. Clair, IL

Built 1972 ADT: 9,500

FAI 64 RAMP #167&1

Unknown

Over: ST CLAIR AVE/FAU9166

0.25 MI E OF 25TH ST, St. Clair, IL

Built 1973 ADT: 6,350

Metrolink

Unknown

Over: 25th St.

0.25 mi N of I-64, St. Clair, IL

Built 1974 ADT: 4,750

IL 3 NB TO EB CD "

Unknown

Over: I-55/64 EB CD "D" & UPRR

PIER P1 TO PIER H1, St. Clair, IL

Built 1972 ADT: 16,600

I-55/64 WB CD

Unknown

Over: 4TH ST IN E ST LOUIS

WB CD over 4th St, St. Clair, IL

Built 1965 ADT: 150

Davis St Ferry Rd

Unknown

Over: FAI 255

1.5 MI. S OF DUPO, St. Clair, IL

Built 1979 ADT: 41,000

S Main St/Old IL 3

Unknown

Over: FAI 255

0.1MI SE DUPO, St. Clair, IL

Built 1983 ADT: 35,700

IL 3 NB Ramp E

Unknown

Over: FAI 255

N DUPO, St. Clair, IL

Built 1983 ADT: 500

IL 3 SB Ramp F

Unknown

Over: FAI 255

N DUPO, St. Clair, IL

Built 1981 ADT: 500

I 255

Unknown

Over: MCBRIDE AVE/TR12

1/2 mi S of IL 157, St. Clair, IL

Built 1979 ADT: 1,450

FAI 255

Unknown

Over: ILL 157

0.50 SO OF DORIS AVE, St. Clair, IL

Built 1979 ADT: 7,550

FAI 255

Unknown

Over: DORIS AVE/FAU 9199

0.5 M N OF ILL 157, St. Clair, IL

Built 1979 ADT: 1,050

FAI 255

Unknown

Over: JEROME LA FAU 9197

0.5 Mi N OF IL 157, St. Clair, IL

Built 1979 ADT: 1,650

FAI 255

Unknown

Over: MOUSETTE LN-FAU 9200

0.4 MI NO DORIS AVE., St. Clair, IL

Built 1979 ADT: 2,950

I-255

Unknown

Over: Church Rd,UPRR,KCSRR

1.25 mi SW of IL 15, St. Clair, IL

Built 1982 ADT: 1,150

FAI 255

Unknown

Over: BOND AVE

S OF ILL 15/MO.AVE, St. Clair, IL

Built 1979 ADT: 3,350

FAI 255

Unknown

Over: ILL 15

1.3 MI S OF STATE ST, St. Clair, IL

Built 1981 ADT: 31,800

POCKET RD/ FAU 923

Unknown

Over: FAI 255

S EDGE FHSP, St. Clair, IL

Built 1981 ADT: 44,300

PARK ROAD TR 515A

Unknown

Over: I255 & HARDING DITCH

FRANK HOLTEN STATE PARK, St. Clair, IL

Built 1981 ADT: 44,300

LAKE DR/ FAU 9185

Unknown

Over: FAI 255/HARDING DTCH

.3 MI E IL 111, St. Clair, IL

Built 1981 ADT: 44,300

FAI 255

Unknown

Over: STATE ST

0.5 M S ST CLAIR AV, St. Clair, IL

Built 1982 ADT: 5,950

FAI 255

Unknown

Over: SUMMIT AVE

0.3 MI N OF STATE ST, St. Clair, IL

Built 1982 ADT: 1,900

I-255 NB

Unknown

Over: St. Clair Ave & Metrolin

0.50 mi N of State St, St. Clair, IL

Built 1982 ADT: 11,800

I-255 SB

Unknown

Over: St. Clair Ave & Metrolin

0.50 mi N State St, St. Clair, IL

Built 1982 ADT: 11,800

FAI 255 NB

Unknown

Over: FAI 64

.75 MI SO BUNKUM RD, St. Clair, IL

Built 1981 ADT: 16,500

Showing 3,401-3,450 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.