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

TR 80

Fair

Over: BRUNK CREEK

NE-25-T10NR1E, Knox, IL

Built 1978 Load: 32.4 t ADT: 50

TR 30

Fair

Over: TRIB S HENDERSON CR.

SW-17-T12NR1E, Knox, IL

Built 1978 Load: 32.4 t ADT: 75

TR 1 CO LINE ROAD

Fair

Over: TRIB TO POPE CREEK

NE-5-T13NR2E, Knox, IL

Built 1980 Load: 32.4 t ADT: 50

TR 278

Fair

Over: TRIB TO WALNUT CREEK

NE-30-T13NR4E, Knox, IL

Built 1980 Load: 32.4 t ADT: 25

TR 39

Fair

Over: WALNUT CREEK

NW-21-T13NR3E, Knox, IL

Built 1982 Load: 32.4 t ADT: 50

CH 39

Fair

Over: SPOON RIVER

SW-34-T9NR2E, Knox, IL

Built 1985 Load: 32.4 t ADT: 175

FAS 399 - CH 26

Fair

Over: TRIB TO CEDAR FORK

E.CTR-7-T10NR1E, Knox, IL

Built 1984 Load: 32.4 t ADT: 725

FAS 394-CH 12

Fair

Over: COURT CREEK

NE 21 - T11N,R3E, Knox, IL

Built 1982 Load: 32.4 t ADT: 900

TR 341

Fair

Over: SPOON RIVER

NE-26-T9NR2E, Knox, IL

Built 1983 Load: 32.4 t ADT: 75

TR 263

Fair

Over: TRIB TO SPOON RIVER

NE-24-T10NR3E, Knox, IL

Built 1983 Load: 32.4 t ADT: 50

TR 329

Fair

Over: HAW CREEK

NE-13-T9NR2E, Knox, IL

Built 1985 Load: 32.4 t ADT: 25

TR 278

Fair

Over: STREAM

NW-5-T13NR4E, Knox, IL

Built 1984 Load: 32.4 t ADT: 100

CH 28

Fair

Over: SPOON RIV

NW-15-T11NR4E, Knox, IL

Built 1987 Load: 32.4 t ADT: 75

CH 15

Fair

Over: WALNUT CREEK

NW-31-T13NR4E, Knox, IL

Built 1988 Load: 32.4 t ADT: 275

FAS 398 - CH 20

Fair

Over: HAW CREEK

E.CTR-2-T9NR2E, Knox, IL

Built 1988 Load: 32.4 t ADT: 100

FAS 394-CH 12

Fair

Over: WALNUT CREEK

NE-21-T13NR3E, Knox, IL

Built 1990 Load: 32.4 t ADT: 200

FAS 1394-CH 7

Fair

Over: NORTH CREEK

SE-36-T12NR2E, Knox, IL

Built 1990 Load: 32.4 t ADT: 250

FAS 403-CH 35

Fair

Over: TRIB TO HENDERSON CR

NW-35-T13NR1E, Knox, IL

Built 1994 Load: 32.4 t ADT: 200

TR 130

Fair

Over: PIG CREEK

SW-34-T10NR2E, Knox, IL

Built 1988 Load: 32.4 t ADT: 50

CH 15

Fair

Over: COURT CREEK

SW-24-T11NR3E, Knox, IL

Built 1992 Load: 32.4 t ADT: 575

TR 619A

Fair

Over: COURT CREEK

NW-24-T11NR3E, Knox, IL

Built 1992 Load: 32.4 t ADT: 10

TR 161

Fair

Over: NORTH CREEK

SW-6-T11NR3E, Knox, IL

Built 1991 Load: 32.4 t ADT: 100

TR 253

Fair

Over: FRENCH CREEK

NE-14-T10NR4E, Knox, IL

Built 1992 Load: 32.4 t ADT: 125

FAS 396-CH 18

Fair

Over: FRENCH CREEK

NW-27-T10NR4E, Knox, IL

Built 1990 Load: 32.4 t ADT: 275

CO. LINE RD.

Fair

Over: CEDAR CREEK

NW-19-T11NR1E, Knox, IL

Built 1995 Load: 32.4 t ADT: 75

E. THIRD ST

Fair

Over: BN RR (062986X)

E. OF BROAD ST, Knox, IL

Built 1998 Load: 32.4 t ADT: 2,650

N. SOANGETAHA RD

Fair

Over: AT&SF RR (004647L)

SE-12-T11NR1E, Knox, IL

Built 2013 Load: 32.4 t ADT: 600

10TH STREET

Fair

Over: PETTIBONE CREEK

0.01KM S OF CROSLEY DR, Lake, IL

Built 1938 Load: 32.4 t ADT: 210

IL 120 WB

Fair

Over: STREAM

0.1 M W OF IL 21, Lake, IL

Built 1960 Load: 32.4 t ADT: 27,900

IL 120 EB

Fair

Over: STREAM

0.1 M W OF IL 21, Lake, IL

Built 1960 Load: 32.4 t ADT: 27,900

DEERFIELD ROAD

Fair

Over: M F N BR CHICAGO RIV

0.9 MI W OF IL 41, Lake, IL

Built 1962 Load: 32.4 t ADT: 3,100

DEERFIELD ROAD

Fair

Over: DESPLAINES RIVER

0.4 MI E OF US-45, Lake, IL

Built 1993 Load: 32.4 t ADT: 15,400

IL 132

Fair

Over: MILL CREEK

0.3 M E OF US45, Lake, IL

Built 1969 Load: 32.4 t ADT: 14,500

IL 137

Fair

Over: SKOKIE RIVER

0.18 M E US 41, Lake, IL

Built 1942 Load: 32.4 t ADT: 19,200

MATHON DR

Fair

Over: UP RR

0.3 M E SHERIDAN, Lake, IL

Built 1968 Load: 32.4 t ADT: 3,650

ARLNTON HTS RD SB

Fair

Over: BUFFALO CREEK

0.4 MI N OF COOK CO, Lake, IL

Built 1980 Load: 32.4 t ADT: 12,350

GRASS LAKE RD.

Fair

Over: W-WAY INLET BLUFF LK

0.7M.W.OF IL-59, Lake, IL

Built 1990 Load: 32.4 t ADT: 9,300

RUSSELL RD

Fair

Over: DES PLAINES RIV

.70 W OF KILBOURN, Lake, IL

Built 1991 Load: 32.4 t ADT: 4,850

STATE LINE RD

Fair

Over: DUTCH GAP CANAL

1.0 MI W US 45, Lake, IL

Built 1960 Load: 32.4 t ADT: 4,850

ROLLINS ROAD

Fair

Over: Manitou Creek

.5M W OF WILSON RD, Lake, IL

Built 2001 Load: 32.4 t ADT: 8,850

KILBOURNE RD

Fair

Over: DES PLAINES TRIB

0.05M S.OFSTATE LINE, Lake, IL

Built 1996 Load: 32.4 t ADT: 3,500

GREGGS PARKWAY

Fair

Over: SEAVEY DRAINAGE DTCH

1 MI W. OF ILL 21, Lake, IL

Built 2004 Load: 32.4 t ADT: 9,900

JUNIPER CT

Fair

Over: W FRK N BR CHGO RIV

.7 M E 94 2.1 M S 22, Lake, IL

Built 1965 Load: 32.4 t ADT: 125

CARRIAGE WAY

Fair

Over: MD FRK N BR CHGO RIV

.8 M E 43 2.5 M S 22, Lake, IL

Built 1977 Load: 32.4 t ADT: 125

DEERFIELD ROAD

Fair

Over: NB CHICAGO RIVER

0.6 MI W OF IL 43, Lake, IL

Built 1994 Load: 32.4 t ADT: 16,600

CUNNINGHAM COURT

Fair

Over: SHERMAN COMER CREEK

990 E HUNT CLUB DR, Lake, IL

Built 2007 Load: 32.4 t ADT: 200

ATWATER PARKWAY

Fair

Over: BOAT CHANNEL

.2 M N IL-132, Lake, IL

Built 1997 Load: 32.4 t ADT: 75

LEONARD DRIVE

Fair

Over: SHERMAN COMERS CREEK

1800'S OF GAGE LK RD, Lake, IL

Built 1992 Load: 32.4 t ADT: 850

LINDEN AVE

Fair

Over: RAVINE

1.9 M N LAKE COOK RD, Lake, IL

Built 1976 Load: 32.4 t ADT: 350

WAVERLY RD

Fair

Over: RAVINE

1.9 N LAKE COOK RD., Lake, IL

Built 1968 Load: 32.4 t ADT: 75

Showing 8,451-8,500 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.