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

IL3NB->255WB Rmp E

Unknown

Over: 255SB->IL3SB Ramp B

NORTH OF COLUMBIA, Monroe, IL

Built 1982 ADT: 35,500

ILL 3 NB

Unknown

Over: Palmer Rd/Palmer Crk

0.8 mi S of I-255, Monroe, IL

Built 1984 ADT: 6,950

IL 3 SB

Unknown

Over: Palmer Rd/Palmer Crk

0.8 mi S of I-255, Monroe, IL

Built 1991 ADT: 4,800

IL 158

Unknown

Over: IL 3

1 MI S COLUMBIA, Monroe, IL

Built 2012 ADT: 22,800

TR 7

Unknown

Over: I-55

1.59M S CO. LINE, Montgomery, IL

Built 1970 ADT: 275

TR 17

Unknown

Over: I-55

3.05M S SANGAMON CO., Montgomery, IL

Built 1970 ADT: 275

CH 17

Unknown

Over: I-55

FARMERSVILLE INTERCH, Montgomery, IL

Built 1973 ADT: 31,000

TR 37

Unknown

Over: I-55

1.5M S FRMERSVLE INT, Montgomery, IL

Built 1971 ADT: 550

CH 16

Unknown

Over: I-55&W F R(FAS 1769)

E EDGE WAGGONER, Montgomery, IL

Built 1972 ADT: 550

IL 48/127

Unknown

Over: I-55

I-55 / IL127/48 INT., Montgomery, IL

Built 1972 ADT: 28,800

IL 108

Unknown

Over: I-55

IL 108/I-55 INTERCH., Montgomery, IL

Built 1973 ADT: 26,800

CH 24

Unknown

Over: I-55

3M SO IL 108, Montgomery, IL

Built 1972 ADT: 26,500

TR 48

Unknown

Over: I-55

2.4M N IL 16 INT., Montgomery, IL

Built 1973 ADT: 26,500

TR 235

Unknown

Over: I-55

1.2M N IL 16 INT., Montgomery, IL

Built 1972 ADT: 26,500

IL 16

Unknown

Over: I-55

LITCHFIELD INTERCHNG, Montgomery, IL

Built 1973 ADT: 26,500

TR 277

Unknown

Over: I-55

1.7M S IL 16 INT., Montgomery, IL

Built 1973 ADT: 28,900

TR 1

Unknown

Over: I-55

SANG/MONT CO LINE, Montgomery, IL

Built 1971 ADT: 400

UNION PACIFIC RR

Unknown

Over: IL 16

SCHRAM CITY WCL, Montgomery, IL

Built 1923 ADT: 2,900

NORFOLK SOUTHERN R

Unknown

Over: IL 127 (WEST ST)

.18M S IL48, RAYMOND, Montgomery, IL

Built 1934 ADT: 2,650

N&W RR

Unknown

Over: TR 163A

.50MI SE HONEY BEND, Montgomery, IL

Built 1912 ADT: 25

RR

Unknown

Over: TR 353

1.3 M E COFFEEN, Montgomery, IL

Built 1900 ADT: 25

GATEWAY WESTERN RR

Unknown

Over: BUS I72/IL104/MORTON

.5M E IL 267-JACKSNV, Morgan, IL

Built 1958 ADT: 10,400

NORFOLK SOUTHERN R

Unknown

Over: OLD US 36

1M E I-72/US 36, Morgan, IL

Built 1948 ADT: 1,100

GATEWAY WESTERN RR

Unknown

Over: ILL 104

REES STATION, Morgan, IL

Built 1908 ADT: 1,750

IL 267

Unknown

Over: TR 967/KCS RR

.3M S JCT US 67, Morgan, IL

Built 1946 ADT: 175

IL 267/US 67/BL 67

Unknown

Over: I-72/US 36

2.5M S IL104-JACKSVL, Morgan, IL

Built 1975 ADT: 9,950

TR 195

Unknown

Over: FAI 72

1.8MI SW I72/OLD36, Morgan, IL

Built 1975 ADT: 9,950

FAI 72 EB

Unknown

Over: ILL 104 & B&N RR

1.1MI SW I72/OLD36, Morgan, IL

Built 1975 ADT: 2,000

FAI 72 WB

Unknown

Over: ILL 104 & B&N RR

1.1MI SW I72/OLD36, Morgan, IL

Built 1975 ADT: 2,000

BUS I72/OLD US 36

Unknown

Over: FAI 72

I72/BUS I72 INT #68, Morgan, IL

Built 1975 ADT: 14,500

NSRR

Unknown

Over: FAI 72

.4M NE I72/BUS I72, Morgan, IL

Built 1975 ADT: 14,500

TR 232

Unknown

Over: FAI 72

1MI E I72/BUS I72, Morgan, IL

Built 1975 ADT: 14,500

TR 284

Unknown

Over: FAI 72

2.5MI E I72/BUS I72, Morgan, IL

Built 1975 ADT: 14,500

TR 318

Unknown

Over: FAI 72

2MI.NW. OF ALEXANDER, Morgan, IL

Built 1975 ADT: 14,500

FAS 614

Unknown

Over: FAI 72

I-72 INT @ ALEXANDER, Morgan, IL

Built 1975 ADT: 14,500

TR 50

Unknown

Over: FAI 72

1.4 MI E SCOTT CO, Morgan, IL

Built 1976 ADT: 8,800

CH 23

Unknown

Over: FAI 72

2.2 MI E SCOTT CO, Morgan, IL

Built 1976 ADT: 8,800

FAI 72 WB

Unknown

Over: US 67

2.75 MI W ILL 267, Morgan, IL

Built 1977 ADT: 5,200

FAI 72 EB

Unknown

Over: US 67

2.75 MI W ILL 267, Morgan, IL

Built 1977 ADT: 5,200

FAI 72/US 36/US67

Unknown

Over: MASSEY LANE TR 128

2.25 MI W IL 267, Morgan, IL

Built 1977 ADT: 700

FAI 72/US 36/US67

Unknown

Over: MASSEY LANE TR 128

2.25 MI W IL 267, Morgan, IL

Built 1977 ADT: 700

TR 96

Unknown

Over: US 67/IL 104

5.2MN US67/I72/US36, Morgan, IL

Built 1998 ADT: 5,450

US 67 SB

Unknown

Over: IL104EB & 104WB RAMP

4.7M N US67/I72/US36, Morgan, IL

Built 1998 ADT: 1,400

US 67 NB

Unknown

Over: IL104EB & 104WB RAMP

4.7M N US67/I72/US36, Morgan, IL

Built 1998 ADT: 225

TR 157

Unknown

Over: US 67

3.9M N US67/I72/US36, Morgan, IL

Built 1998 ADT: 5,450

BUS I 72/MORTON AV

Unknown

Over: US 67

2.6M N US67/I72/US36, Morgan, IL

Built 1998 ADT: 5,200

TR 187

Unknown

Over: US 67

1.4M N US67/I72/US36, Morgan, IL

Built 1998 ADT: 5,200

FAS 579/CH 7

Unknown

Over: US 67/IL 104

1.2 mi E of Chapin, Morgan, IL

Built 2012 ADT: 6,450

MOUND ROAD

Unknown

Over: IL 104

.3M N MORTON-JACKSVL, Morgan, IL

Built 2011 ADT: 2,450

FAP 745(IL 104)

Unknown

Over: Washington St

Meredosia, Morgan, IL

Built 2018 ADT: 325

Showing 2,951-3,000 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.