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

GRANGE RD

Good

Over: BLUE JOINT DITCH

4 MI. NE. OF GENESEO, Henry, IL

Built 1995 Load: 36.3 t ADT: 350

US 45-52/FAP 840

Good

Over: Drainage Ditch

0.30 mi S of K3 Co, Iroquois, IL

Built 2013 Load: 36.3 t ADT: 3,650

TR 353

Good

Over: PIGEON CREEK

SEC 7 T24N R13W 2ND, Iroquois, IL

Built 1996 Load: 36.3 t ADT: 25

FAS327-CH41

Good

Over: POSSUM TROT DITCH

3.8MI S,US24, Iroquois, IL

Built 1994 Load: 36.3 t ADT: 325

FAS 914

Good

Over: AUSTIN CREEK

S 1/2 SEC 34 T8S R4W, Jackson, IL

Built 1990 Load: 36.3 t ADT: 150

FAS 919

Good

Over: CREEK

N. LINE SEC. 35-9-1, Jackson, IL

Built 1960 Load: 36.3 t ADT: 4,550

FAP-821 (ILL 15)

Good

Over: POLE CAT CREEK

5 MI E WASH CO LN, Jefferson, IL

Built 2017 Load: 36.3 t ADT: 3,100

IL 64

Good

Over: VIRGIL DITCH #2

2.8 M W OF IL 47, Kane, IL

Built 1993 Load: 36.3 t ADT: 6,950

I-88

Good

Over: STREAM

.5 MI W. OF ILL 47, Kane, IL

Built 1972 Load: 36.3 t ADT: 31,700

MCKEE STREET

Good

Over: TRIB OF MILL CREEK

0.02 MI E WENMOTH RD, Kane, IL

Built 1976 Load: 36.3 t ADT: 75

Farnsworth Ave.

Good

Over: Indian Creek

1.0 MI S I-88Tollway, Kane, IL

Built 2022 Load: 36.3 t ADT: 23,300

FAS 311 CH 9

Good

Over: N BRANCH ROCK CREEK

1.4 MI W OF US 45, Kankakee, IL

Built 1977 Load: 36.3 t ADT: 3,050

JOLIET ROAD

Good

Over: VALLEY RUN CREEK

CH19 OVR VALLEY RUN, Kendall, IL

Built 1958 Load: 36.3 t ADT: 500

FAS 393-CH 4

Good

Over: MUD RUN CREEK

E.CTR-14-T13NR3E, Knox, IL

Built 1998 Load: 36.3 t ADT: 700

FAS 393 - CH 4

Good

Over: WALNUT CREEK

E.CTR-17-T13NR3E, Knox, IL

Built 2019 Load: 36.3 t ADT: 300

IL 179

Good

Over: LONG POINT CREEK

2.8 M E OF US 51, LaSalle, IL

Built 1995 Load: 36.3 t ADT: 300

CH 45

Good

Over: DIAMOND CREEK

E 11TH RD N 120, LaSalle, IL

Built 1986 Load: 36.3 t ADT: 225

CO RD 5

Good

Over: WOLF CREEK

N 17TH,E 1925, LaSalle, IL

Built 2020 Load: 36.3 t ADT: 1,150

FAS-1808 (SBI-12)

Good

Over: BEAVER POND

3 MI E LAWRENCEVILLE, Lawrence, IL

Built 1985 Load: 36.3 t ADT: 2,450

FAP 327 (US 50)

Good

Over: OTTER POND DITCH

1.5 MI E IL 1 INT, Lawrence, IL

Built 2019 Load: 36.3 t ADT: 4,800

OLD OLD RT 66/SBI

Good

Over: DITCH

IN DWIGHT W OF ILL47, Livingston, IL

Built 1980 Load: 36.3 t ADT: 1,150

US 24/FAP 317

Good

Over: DRAIN DITCH

1.56 M W IL 47, Livingston, IL

Built 1993 Load: 36.3 t ADT: 4,450

FAS 342 CH 3

Good

Over: STREAM

5.97 MI S OF US 24, Livingston, IL

Built 2007 Load: 36.3 t ADT: 375

CH 16

Good

Over: EAGLE CREEK

1.5 SW STREATOR, Livingston, IL

Built 1981 Load: 36.3 t ADT: 850

TR 224

Good

Over: GOOSEBERRY CREEK

3085N, 2600E, Livingston, IL

Built 1999 Load: 36.3 t ADT: 50

OLD IL 121

Good

Over: BRAINARDS BRANCH

.7M N BL55 NW LINCLN, Logan, IL

Built 1998 Load: 36.3 t ADT: 1,250

IL 140

Good

Over: Paddock Creek

1.9mi E of IL 159, Madison, IL

Built 1985 Load: 36.3 t ADT: 5,650

BLACK LANE

Good

Over: CANTEEN CREEK

.5 N OF COUNTY LINE, Madison, IL

Built 2001 Load: 36.3 t ADT: 950

FAS 775/POCAHONTAS

Good

Over: SUGAR FK CK

1.4MI E MARINE, Madison, IL

Built 1959 Load: 36.3 t ADT: 800

JONESBORO ROAD

Good

Over: TRIB Q DITCH EAST BR

1050N-0600E, Massac, IL

Built 1991 Load: 36.3 t ADT: 1,200

TR 123

Good

Over: UNNAMED CREEK

1.25 MI E FAS 929, Massac, IL

Built 1992 Load: 36.3 t ADT: 800

ALGONQUIN ROAD

Good

Over: CRYSTAL CREEK

02M W OF PYOTT, McHenry, IL

Built 2004 Load: 36.3 t ADT: 31,600

FRANKLINVILLE RD

Good

Over: TRIB KISH RIVER

0.1 MI S PERKINS RD, McHenry, IL

Built 2016 Load: 36.3 t ADT: 1,500

SBI-2 (OLD 51)

Good

Over: DITCH

.55 MI N OF US 136, McLean, IL

Built 1990 Load: 36.3 t ADT: 1,050

FAS 349 CH 13

Good

Over: ROOKS CREEK

3050 N, 3350 E, McLean, IL

Built 2008 Load: 36.3 t ADT: 650

FAS 617 / CH 18

Good

Over: BRANCH APPLE CREEK

4.5 MI SW WAVERLY, Morgan, IL

Built 1993 Load: 36.3 t ADT: 225

LOWELL PARK RD.

Good

Over: UNNAMED CREEK

4.2 MI SW MT.MORRIS, Ogle, IL

Built 2002 Load: 36.3 t ADT: 1,000

TR 109

Good

Over: TRIB TO BONNIE CREEK

2 MI N OF ILL RT 154, Perry, IL

Built 1900 Load: 36.3 t ADT: 125

TR 95A-SANDUSKY RD

Good

Over: PULASKI SLOUGH

0.5 MI SW PULASKI, Pulaski, IL

Built 1996 Load: 36.3 t ADT: 225

Scott Drive NB

Good

Over: ASH CREEK

0.4 M N JCT ILL 161, St. Clair, IL

Built 1952 Load: 36.3 t ADT: 3,700

Scott Drive SB

Good

Over: ASH CREEK

0.4 M N JCT ILL 161, St. Clair, IL

Built 1952 Load: 36.3 t ADT: 3,700

EAST ANGLE ROAD

Good

Over: CEDAR CREEK

2.7 MI E OF ILL 26, Stephenson, IL

Built 1898 Load: 36.3 t ADT: 50

FAS 467-CH 5

Good

Over: MUD CREEK

N.CTR-11-T24NR3W, Tazewell, IL

Built 2001 Load: 36.3 t ADT: 1,550

TR 48

Good

Over: S HENDERSON CREEK

NW-23-T10NR3W, Warren, IL

Built 1979 Load: 36.3 t ADT: 50

CORDOVA ROAD

Good

Over: DRAINAGE DITCH

3.7 MI WEST OF ERIE, Whiteside, IL

Built 2004 Load: 36.3 t ADT: 325

WOLF RD

Good

Over: HICKORY CREEK TRIB

0.7 M N OF US 30, Will, IL

Built 1995 Load: 36.3 t ADT: 10,800

OGDEN ROAD

Good

Over: LITTLE WOLF CREEK

OGDEN RD WEST OF HWY 148, Williamson, IL

Built 1998 Load: 36.3 t ADT: 35

TR 548

Good

Over: POND CREEK

5 MILES N PITTSBURG, Williamson, IL

Built 1985 Load: 36.3 t ADT: 325

FAS 1887-CH 12

Good

Over: S FORK SALINE R OVFL

3.5 MI S CRABORCHARD, Williamson, IL

Built 1988 Load: 36.3 t ADT: 1,150

FAS1887-SARAVILLE

Good

Over: S FORK SALINE RIVER

4 MI S CRAB ORCHARD, Williamson, IL

Built 1997 Load: 36.3 t ADT: 1,150

Showing 22,551-22,600 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.