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 27

Fair

Over: MAIN DITCH

1 MI SE FOREST CITY, Mason, IL

Built 1983 Load: 32.4 t ADT: 50

TR 206A

Fair

Over: MAIN DITCH

3 MI SE FOREST CITY, Mason, IL

Built 1956 Load: 32.4 t ADT: 225

TR 234

Fair

Over: ALLENS GROVE DITCH

7 MI WEST SAN JOSE, Mason, IL

Built 1983 Load: 32.4 t ADT: 50

TR 158

Fair

Over: FURRER DITCH

2 MI NE EASTON, Mason, IL

Built 1983 Load: 32.4 t ADT: 25

TR 165

Fair

Over: JORDAN CREEK

3MI NW KILBOURNE, Mason, IL

Built 1988 Load: 32.4 t ADT: 50

TR 129

Fair

Over: DUFF ARMSTRONG DITCH

2.5 MI. SW EASTON, Mason, IL

Built 1988 Load: 32.4 t ADT: 25

TR 129

Fair

Over: DUFF ARMSTRONG DITCH

2 MI SSW EASTON, Mason, IL

Built 1988 Load: 32.4 t ADT: 75

TR 165

Fair

Over: CRANE CR

3.5 MI NE KILBORNE, Mason, IL

Built 1976 Load: 32.4 t ADT: 50

TR 100 (2400E)

Fair

Over: Crane Creek

0.60 mi S TR 129, Mason, IL

Built 2015 Load: 32.4 t ADT: 25

TR 153

Fair

Over: LOCAL DITCH

3M S EASTON, Mason, IL

Built 1996 Load: 32.4 t ADT: 25

TR 125

Fair

Over: BECKER DITCH

3 MI ENE MASON CITY, Mason, IL

Built 1982 Load: 32.4 t ADT: 25

TR 171

Fair

Over: PRAIRIE CK

4.5 MI ESEMASON CTY, Mason, IL

Built 1978 Load: 32.4 t ADT: 175

TR 276

Fair

Over: SUGAR CREEK

5 MI SE OFMASON CITY, Mason, IL

Built 1980 Load: 32.4 t ADT: 50

TR 189

Fair

Over: CENW RR

3.5 MI ESE MASON CIT, Mason, IL

Built 1984 Load: 32.4 t ADT: 50

TR 193A

Fair

Over: SALT CREEK TRIBUTARY

5 MI SW MASON CITY, Mason, IL

Built 2010 Load: 32.4 t ADT: 75

FAP 614 (IL 78)

Fair

Over: DITCH

1.50 M S US 136, Mason, IL

Built 1978 Load: 32.4 t ADT: 2,250

IL 10

Fair

Over: DITCH

1.50M S US 136, Mason, IL

Built 1970 Load: 32.4 t ADT: 550

IL 10

Fair

Over: DITCH

.50M S US 136, Mason, IL

Built 1970 Load: 32.4 t ADT: 550

ORCHARD ROAD

Fair

Over: BARNES CREEK

1.5 MI E ILL 145, Massac, IL

Built 1979 Load: 32.4 t ADT: 25

TWP RD 39

Fair

Over: Q DITCH

INT RTE 45 & TR 39, Massac, IL

Built 1977 Load: 32.4 t ADT: 250

MIDWAY ROAD

Fair

Over: BARNES CREEK

1.8 MI E OF ILL 145, Massac, IL

Built 1981 Load: 32.4 t ADT: 100

FAS 959

Fair

Over: MASSAC CREEK

.15 MI WEST ILL 145, Massac, IL

Built 1983 Load: 32.4 t ADT: 300

TR 21

Fair

Over: PATTERSON BRANCH

1 MI WEST US RTE 45, Massac, IL

Built 1983 Load: 32.4 t ADT: 50

MASSAC CREEK RD

Fair

Over: MASSAC CREEK

1.2 MI N METROPOLIS, Massac, IL

Built 1997 Load: 32.4 t ADT: 1,150

SUNSET LA

Fair

Over: IC-CN RR

0.5 MI S ROUND KNOB, Massac, IL

Built 2010 Load: 32.4 t ADT: 50

THOMPSON LANE

Fair

Over: TRIB TO BARNES CREEK

2 MI S POPE COUNTY, Massac, IL

Built 2009 Load: 32.4 t ADT: 10

FAS 1441 - CH 22

Fair

Over: CAMP CREEK

N.CTR-34-T5NR2W, McDonough, IL

Built 1981 Load: 32.4 t ADT: 350

FAU 6938 (CH 20)

Fair

Over: SPRING CR

NW-22-T6NR3W, McDonough, IL

Built 1983 Load: 32.4 t ADT: 325

WEAVER RD-TR 3A

Fair

Over: DROWNING FORK CREEK

NW-3-T7NR1W, McDonough, IL

Built 1987 Load: 32.4 t ADT: 75

TR 31

Fair

Over: DROWNING FORK

N.CTR-22-T7NR1W, McDonough, IL

Built 1976 Load: 32.4 t ADT: 275

TR 7

Fair

Over: N.F. CROOKED CREEK

SW-2-T7NR2W, McDonough, IL

Built 1999 Load: 32.4 t ADT: 200

TR 268

Fair

Over: E FORK LITTLE CREEK

W.CTR-1-T7NR3W, McDonough, IL

Built 1980 Load: 32.4 t ADT: 20

TR 34

Fair

Over: LAHARPE CREEK

NE-30-T7NR4W, McDonough, IL

Built 1981 Load: 32.4 t ADT: 50

TR 350

Fair

Over: E FORK LAMOINE RIVER

NE-22-T6NR2W, McDonough, IL

Built 1978 Load: 32.4 t ADT: 75

TR 312

Fair

Over: E FORK LAMOINE RIVER

NW-21-T6NR2W, McDonough, IL

Built 1986 Load: 32.4 t ADT: 525

TR 95

Fair

Over: DROWNING FORK

SW-5-T6NR1W, McDonough, IL

Built 1978 Load: 32.4 t ADT: 50

TR 77A

Fair

Over: DROWNING FORK CREEK

NW-5-T6NR1W, McDonough, IL

Built 1984 Load: 32.4 t ADT: 75

TR 302

Fair

Over: CAMP CR

S.CTR-32-T5NR2W, McDonough, IL

Built 1983 Load: 32.4 t ADT: 75

TR 324

Fair

Over: CAMP CREEK

S. CTR-33-T5NR2W, McDonough, IL

Built 1996 Load: 32.4 t ADT: 50

TR 253

Fair

Over: KILLJORDAN CR

S.CTR-16-T5NR3W, McDonough, IL

Built 1999 Load: 32.4 t ADT: 125

TR 58

Fair

Over: LAMOINE RIVER

CTR-21-T4NR4W, McDonough, IL

Built 1980 Load: 32.4 t ADT: 75

TR 232

Fair

Over: GRINDSTONE CREEK

W.CTR-27-T4NR3W, McDonough, IL

Built 1978 Load: 32.4 t ADT: 75

TR 192

Fair

Over: CAMP CREEK

SE-19-T4NR3W, McDonough, IL

Built 1980 Load: 32.4 t ADT: 25

TR 362

Fair

Over: CARTER CR

W.CTR-24-T4N,R2W, McDonough, IL

Built 1983 Load: 32.4 t ADT: 75

IL 23

Fair

Over: RILEY CREEK

1.2 M N I-90 TOLL, McHenry, IL

Built 2002 Load: 32.4 t ADT: 5,200

US 14

Fair

Over: LAWRENCE CREEK

0.47 M S STATE LINE, McHenry, IL

Built 2006 Load: 32.4 t ADT: 6,500

US 14

Fair

Over: LAWRENCE CR BYPASS

.52M S OF STATE LINE, McHenry, IL

Built 2006 Load: 32.4 t ADT: 6,500

PEARL ST

Fair

Over: FOX RIVER

0.05 MI W RIVER RD, McHenry, IL

Built 1977 Load: 32.4 t ADT: 4,500

THOMPSON ROAD

Fair

Over: NIPPERSINK CREEK

0.03 N WNDRMERE RD, McHenry, IL

Built 2011 Load: 32.4 t ADT: 1,600

WINN ROAD

Fair

Over: NIPPERSINK CREEK

0.4 MI N US 12, McHenry, IL

Built 2012 Load: 32.4 t ADT: 3,800

Showing 8,901-8,950 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.