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 259

Fair

Over: TOMS CREEK

NW-31-T13NR1W, Mercer, IL

Built 1988 Load: 32.4 t ADT: 50

TR 1

Fair

Over: DUCK CREEK

SE-32-T13NR3W, Mercer, IL

Built 1984 Load: 32.4 t ADT: 20

TR 212

Fair

Over: POPE CREEK

E.CTR-33-T14NR2W, Mercer, IL

Built 1988 Load: 32.4 t ADT: 25

TR 128

Fair

Over: EDWARDS RIVER

W.CTR-7-T14NR3W, Mercer, IL

Built 1986 Load: 32.4 t ADT: 175

TR 165

Fair

Over: STURGEON BAY

NW-19-T14NR5W, Mercer, IL

Built 1980 Load: 32.4 t ADT: 50

TR 198

Fair

Over: CAMP CREEK

SW-19-T15NR2W, Mercer, IL

Built 1975 Load: 32.4 t ADT: 50

TR 114

Fair

Over: CAMP CREEK

SE-23-T15NR4W, Mercer, IL

Built 1981 Load: 32.4 t ADT: 75

TR 77

Fair

Over: CAMP CREEK

E.CTR-27-T15NR4W, Mercer, IL

Built 1986 Load: 32.4 t ADT: 25

TR 20

Fair

Over: KEATING CREEK

SW-8-T15NR5W, Mercer, IL

Built 1983 Load: 32.4 t ADT: 25

CH 12

Fair

Over: DENNIS HOLLOW CREEK

1 ME VALMEYER SEC 2, Monroe, IL

Built 1982 Load: 32.4 t ADT: 775

FAS 1857

Fair

Over: MAEYSTOWN CREEK

1.5 M SW O MAEYSTOWN, Monroe, IL

Built 1980 Load: 32.4 t ADT: 325

HH ROAD TR 47

Fair

Over: FOUNTAIN CREEK

5 M NW OF WATERLO 6, Monroe, IL

Built 1981 Load: 32.4 t ADT: 475

GALL RD FAU 9345

Fair

Over: TRIBUTARY TO CARR CK

COLUMBIA, Monroe, IL

Built 1982 Load: 32.4 t ADT: 1,550

TR 145 S. FORK RD

Fair

Over: HORSE CR

SEC 12 RD DIST 4, Monroe, IL

Built 1984 Load: 32.4 t ADT: 75

MARTINI RDTR59

Fair

Over: KOPP CREEK

SECTION 21RD DIS 2, Monroe, IL

Built 1985 Load: 32.4 t ADT: 200

TR 96 "M" ROAD

Fair

Over: RICHLAND CREEK

SEC 15 RD.DIST. 1, Monroe, IL

Built 1987 Load: 32.4 t ADT: 175

TR133 BRANDT RD

Fair

Over: MAEYSTOWN CR

SEC 6 ROAD DIST 8, Monroe, IL

Built 1986 Load: 32.4 t ADT: 175

FAS 1857

Fair

Over: ONE MILE RACE CREEK

4M SE. FULTS ON CH3, Monroe, IL

Built 1988 Load: 32.4 t ADT: 250

TR 145 S. FORK RD

Fair

Over: SOUTH FORK

SEC 15 RD DIST 4, Monroe, IL

Built 1988 Load: 32.4 t ADT: 75

TR 21 STEPPIG RD.

Fair

Over: LITTLE CARR CK.

3 MI SW COLUMBIA #5, Monroe, IL

Built 1988 Load: 32.4 t ADT: 125

TR 170

Fair

Over: DRY FORK CR.

1.5 MI. E. RENAULT, Monroe, IL

Built 1990 Load: 32.4 t ADT: 50

TR 141 FULTS RD

Fair

Over: FULTS CREEK

SEC 22 RD DIST 8, Monroe, IL

Built 1992 Load: 32.4 t ADT: 75

GILMORE LK RD/ TR

Fair

Over: TRIB GERHARDT CREEK

ROAD DISTRICT 2, Monroe, IL

Built 1992 Load: 32.4 t ADT: 250

TR 7

Fair

Over: CARR CREEK

ROAD DIST 5, Monroe, IL

Built 1992 Load: 32.4 t ADT: 75

TR 56B / D ROAD

Fair

Over: FOUNTAIN CREEK

RD DIST #6, Monroe, IL

Built 1995 Load: 32.4 t ADT: 200

FAS 1857

Fair

Over: LAKE MILDRED OUTLET

5.5 MI. SE FULTS CH3, Monroe, IL

Built 1996 Load: 32.4 t ADT: 250

GALL RD./ FAU 9345

Fair

Over: TRIB CARR CK

COLUMBIA, Monroe, IL

Built 1992 Load: 32.4 t ADT: 1,550

FAS 1857

Fair

Over: TRIB. TO MOREDOCK LK

VALMEYER, Monroe, IL

Built 1998 Load: 32.4 t ADT: 650

MS 5900A RAMSEY RD

Fair

Over: PALMER CR

1.5 WEST OF COL, Monroe, IL

Built 1986 Load: 32.4 t ADT: 350

FAI 55 W FR

Fair

Over: MACOUPIN CREEK

.75 MI S OF CH 17, Montgomery, IL

Built 1949 Load: 32.4 t ADT: 450

NOKOMIS BLACKTOP

Fair

Over: W FORK BLUE GRASS CR

.3M E IL 127, Montgomery, IL

Built 1938 Load: 32.4 t ADT: 900

TR 450

Fair

Over: STREAM

6.0 MI E NOKOMIS, Montgomery, IL

Built 1976 Load: 32.4 t ADT: 75

TR 121

Fair

Over: MDL FK SHOAL CK

7.0 MI W COALTON, Montgomery, IL

Built 1976 Load: 32.4 t ADT: 50

TR 371

Fair

Over: BEARCAT CREEK

4.5 MI W COFFEEN, Montgomery, IL

Built 1977 Load: 32.4 t ADT: 175

TR 271A

Fair

Over: TRIB W FK SHOAL CR

2.3 SE LITCHFIELD, Montgomery, IL

Built 1978 Load: 32.4 t ADT: 200

TR 219B

Fair

Over: LITTLE CREEK

1 MI W IRVING, Montgomery, IL

Built 1982 Load: 32.4 t ADT: 25

FAS 724

Fair

Over: EAST FORK SHOAL CR.

2 MI S WITT, Montgomery, IL

Built 1981 Load: 32.4 t ADT: 200

TR 52

Fair

Over: MACOUPIN CREEK

3.1 MI N WAGGONER, Montgomery, IL

Built 1978 Load: 32.4 t ADT: 100

TR 211

Fair

Over: E. FORK SHOAL CREEK

3 MI S WITT, Montgomery, IL

Built 1980 Load: 32.4 t ADT: 25

TR 185

Fair

Over: CAESAR CREEK

6.5 MI SE WITT, Montgomery, IL

Built 1978 Load: 32.4 t ADT: 125

TR 158

Fair

Over: STREAM

3 MI W HILLSBORO, Montgomery, IL

Built 1978 Load: 32.4 t ADT: 75

TR 125

Fair

Over: W FORK SHOAL CREEK

1.4 MI S RAYMOND, Montgomery, IL

Built 1978 Load: 32.4 t ADT: 125

TR 351

Fair

Over: TRIB. E FORK SHOAL C

1.5 MI NE COFFEEN, Montgomery, IL

Built 1980 Load: 32.4 t ADT: 50

TR 335

Fair

Over: DRY FORK

1.5 MI SW FILLMORE, Montgomery, IL

Built 1982 Load: 32.4 t ADT: 50

TR 45

Fair

Over: MACOUPIN CREEK

3 MI SW FARMERSVILLE, Montgomery, IL

Built 1981 Load: 32.4 t ADT: 75

TR 124

Fair

Over: W FORK SHOAL CREEK

0.5 MI N RAYMOND, Montgomery, IL

Built 1981 Load: 32.4 t ADT: 75

TR 467

Fair

Over: GROVE BRANCH

3 MI S WALSHVILLE, Montgomery, IL

Built 1982 Load: 32.4 t ADT: 75

TR 274

Fair

Over: MIDDLE FK SHOAL CR

7 MI W NOKOMIS, Montgomery, IL

Built 1981 Load: 32.4 t ADT: 75

TR 103

Fair

Over: RAMSEY CREEK

3 MI SE OHLMAN, Montgomery, IL

Built 1982 Load: 32.4 t ADT: 75

TR 94

Fair

Over: THREE MILE BRANCH

3.5 MI SW RAYMOND, Montgomery, IL

Built 1986 Load: 32.4 t ADT: 125

Showing 9,001-9,050 of 27,743 bridges

Related

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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.