State profile · Near median Poor share

Illinois bridge safety

According to the Federal Highway Administration's 2024 National Bridge Inventory, condition ratings, load ratings, and Poor-condition shares for every public highway bridge in Illinois.

26,928
Public bridges
45.6%
Good condition
9.3%
Poor condition

Illinois holds 26,928 public highway bridges (#2 of 52 by inventory) with a 9.35% Poor share (#12 of 52 by Poor share).

That is 9.3% of the state's inventory, against an average of 7.5% across the 54 states and territories with Poor-rated bridges on file, which places it 41 of 54 ordered from the lowest Poor share upward. A bridge is rated Poor when its weakest applicable component scores 4 or below on the inspecting agency's 0-9 scale, so the category is a maintenance and funding signal rather than a closure order or a live crossing-safety verdict.

Inventory: FHWA NBI 2024 · last ETL August 2026

Total Bridges

26,928

Public highway bridges in Illinois

Good Condition

45.6%

12,289 bridges rated 7-9

-4.4pp vs 50% benchmark

Poor Condition

9.3%

2,517 bridges whose lowest applicable component is rated 0-4

1.8pp vs national avg 7.5%

Illinois vs national bridge condition

Illinois - Good condition share 45.6%
National avg

Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).

Illinois - Poor-condition share 31.2%
National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.5%.

Illinois in the national condition pattern

Each point is a state or territory in the FHWA NBI; the highlighted point is this profile.

Inventory size and Poor-condition share are different measures: Illinois has 26,928 bridges and a 9.3% Poor-condition share in the 2024 NBI, rank #41 of 54 jurisdictions ordered from the lowest share upward. The dashed comparisons mark the national average state rate and the midpoint of the plotted inventory range; neither is a live safety or closure threshold. Scatter plot of 54 data points. 0%10%20%30%40% 0k20k40k60k Public bridges in inventory (thousands) Poor-condition share (%) IL, Public bridges in inventory (thousands): 26.9k · Poor-condition share (%): 9.35%AL, Public bridges in inventory (thousands): 16.2k · Poor-condition share (%): 3.35%AK, Public bridges in inventory (thousands): 1.7k · Poor-condition share (%): 7.89%AZ, Public bridges in inventory (thousands): 8.6k · Poor-condition share (%): 1.15%AR, Public bridges in inventory (thousands): 13k · Poor-condition share (%): 5.43%CA, Public bridges in inventory (thousands): 25.8k · Poor-condition share (%): 5.91%CO, Public bridges in inventory (thousands): 9k · Poor-condition share (%): 4.82%CT, Public bridges in inventory (thousands): 4.4k · Poor-condition share (%): 4.72%DE, Public bridges in inventory (thousands): 0.9k · Poor-condition share (%): 1.26%DC, Public bridges in inventory (thousands): 0.3k · Poor-condition share (%): 1.95%FL, Public bridges in inventory (thousands): 13k · Poor-condition share (%): 2.79%GA, Public bridges in inventory (thousands): 15.1k · Poor-condition share (%): 1.59%GU, Public bridges in inventory (thousands): 0k · Poor-condition share (%): 12.77%HI, Public bridges in inventory (thousands): 1.2k · Poor-condition share (%): 6.53%ID, Public bridges in inventory (thousands): 4.6k · Poor-condition share (%): 4.9%IN, Public bridges in inventory (thousands): 19.5k · Poor-condition share (%): 5.22%IA, Public bridges in inventory (thousands): 23.7k · Poor-condition share (%): 19.16%KS, Public bridges in inventory (thousands): 24.9k · Poor-condition share (%): 5.26%KY, Public bridges in inventory (thousands): 14.5k · Poor-condition share (%): 7.37%LA, Public bridges in inventory (thousands): 12.7k · Poor-condition share (%): 11.48%ME, Public bridges in inventory (thousands): 2.5k · Poor-condition share (%): 15.41%MD, Public bridges in inventory (thousands): 5.5k · Poor-condition share (%): 4.56%MA, Public bridges in inventory (thousands): 5.3k · Poor-condition share (%): 8.88%MI, Public bridges in inventory (thousands): 11.4k · Poor-condition share (%): 11.27%MN, Public bridges in inventory (thousands): 13.5k · Poor-condition share (%): 4.44%MS, Public bridges in inventory (thousands): 16.7k · Poor-condition share (%): 6.03%MO, Public bridges in inventory (thousands): 24.6k · Poor-condition share (%): 8.95%MT, Public bridges in inventory (thousands): 5.2k · Poor-condition share (%): 6.81%NE, Public bridges in inventory (thousands): 15.4k · Poor-condition share (%): 7.9%NV, Public bridges in inventory (thousands): 2.1k · Poor-condition share (%): 1.14%NH, Public bridges in inventory (thousands): 2.5k · Poor-condition share (%): 7.51%NJ, Public bridges in inventory (thousands): 6.8k · Poor-condition share (%): 6.01%NM, Public bridges in inventory (thousands): 4k · Poor-condition share (%): 4.51%NY, Public bridges in inventory (thousands): 17.6k · Poor-condition share (%): 9.43%NC, Public bridges in inventory (thousands): 19.2k · Poor-condition share (%): 6.76%ND, Public bridges in inventory (thousands): 4.3k · Poor-condition share (%): 10.98%OH, Public bridges in inventory (thousands): 26.7k · Poor-condition share (%): 4.74%OK, Public bridges in inventory (thousands): 22.9k · Poor-condition share (%): 7.7%OR, Public bridges in inventory (thousands): 8.3k · Poor-condition share (%): 4.61%PA, Public bridges in inventory (thousands): 23.3k · Poor-condition share (%): 12.58%PR, Public bridges in inventory (thousands): 2.4k · Poor-condition share (%): 13.92%RI, Public bridges in inventory (thousands): 0.8k · Poor-condition share (%): 15.2%SC, Public bridges in inventory (thousands): 9.5k · Poor-condition share (%): 6.17%SD, Public bridges in inventory (thousands): 5.9k · Poor-condition share (%): 16.36%TN, Public bridges in inventory (thousands): 20.4k · Poor-condition share (%): 4.41%TX, Public bridges in inventory (thousands): 56.7k · Poor-condition share (%): 1.23%UT, Public bridges in inventory (thousands): 3.1k · Poor-condition share (%): 2.91%VT, Public bridges in inventory (thousands): 2.9k · Poor-condition share (%): 2.9%VI, Public bridges in inventory (thousands): 0k · Poor-condition share (%): 29.17%VA, Public bridges in inventory (thousands): 14.1k · Poor-condition share (%): 3.39%WA, Public bridges in inventory (thousands): 8.5k · Poor-condition share (%): 5.45%WV, Public bridges in inventory (thousands): 7.3k · Poor-condition share (%): 18.64%WI, Public bridges in inventory (thousands): 14.4k · Poor-condition share (%): 6.52%WY, Public bridges in inventory (thousands): 3.1k · Poor-condition share (%): 6.51%
Inventory size and Poor-condition share are different measures: Illinois has 26,928 bridges and a 9.3% Poor-condition share in the 2024 NBI, rank #41 of 54 jurisdictions ordered from the lowest share upward. The dashed comparisons mark the national average state rate and the midpoint of the plotted inventory range; neither is a live safety or closure threshold.

Illinois vs all states by public bridge inventory

Where this state's FHWA NBI public-highway bridge count sits among every state and territory on PlainBridges

26,928 2nd of 54 higher than 52 of 54 states

States and territories, banded by public bridge inventory size

Each bar is a band; taller bars hold more states. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source FHWA National Bridge Inventory · 2024

Read the rank neighborhood for Illinois

The highlighted point is Illinois: 26,928 bridges and 9.35% in Poor condition, rank #41 of 54 jurisdictions ordered from the lowest share upward. The five jurisdictions immediately above and below Illinois on that same Poor-share ordering:

  • Massachusetts: 5,295 bridges · 8.88% Poor
  • Missouri: 24,618 bridges · 8.95% Poor
  • Illinois: 26,928 bridges · 9.35% Poor
  • New York: 17,642 bridges · 9.43% Poor
  • North Dakota: 4,255 bridges · 10.98% Poor

The full national sortable table lives on the rankings page.

Material families in Illinois

Exclusive FHWA material families across all 26,928 bridges in this state; continuous variants fold into the parent family. Orthogonal to the Poor-share scatter above.

Who maintains Illinois’s inventory

State agency holds 31.3% of the 26,928 public highway bridges filed under Illinois in the 2024 NBI, the agency-of-record split for this state, not a condition verdict.

When Illinois’s bridges were built

Pre-1950 construction accounts for 11.2% of the 26,928 bridges with a recorded original year in Illinois. Era bands are orthogonal to the Poor-share ranking above.

Condition Distribution

Illinois45.6%45%9.3%GoodFairPoor
Bridge inventory deck-condition mix - Illinois (FHWA NBI)

Counties (102)

Adams 319 Alexander 93 Bond 162 Boone 109 Brown 71 Bureau 375 Calhoun 81 Carroll 179 Cass 77 Champaign 727 Christian 321 Clark 230 Clay 166 Clinton 190 Coles 304 Cook 1721 Crawford 197 Cumberland 169 De Witt 192 DeKalb 261 Douglas 232 DuPage 344 Edgar 278 Edwards 79 Effingham 253 Fayette 357 Ford 302 Franklin 310 Fulton 210 Gallatin 82 Greene 162 Grundy 269 Hamilton 165 Hancock 292 Hardin 61 Henderson 142 Henry 328 Iroquois 570 Jackson 228 Jasper 181 Jefferson 260 Jersey 113 Jo Daviess 193 Johnson 118 Kane 336 Kankakee 344 Kendall 132 Knox 304 LaSalle 528 Lake 251 Lawrence 185 Lee 371 Livingston 579 Logan 292 Macon 346 Macoupin 242 Madison 523 Marion 296 Marshall 155 Mason 86 Massac 132 McDonough 209 McHenry 227 McLean 624 Menard 89 Mercer 163 Monroe 132 Montgomery 261 Morgan 234 Moultrie 172 Ogle 377 Peoria 352 Perry 136 Piatt 246 Pike 330 Pope 88 Pulaski 108 Putnam 50 Randolph 149 Richland 151 Rock Island 272 Saline 185 Sangamon 466 Schuyler 114 Scott 99 Shelby 335 St. Clair 486 Stark 93 Stephenson 342 Tazewell 358 Union 192 Vermilion 494 Wabash 89 Warren 199 Washington 233 Wayne 266 White 214 Whiteside 278 Will 649 Williamson 201 Winnebago 467 Woodford 223

Illinois vs nearby ranks

Adjacent states by Poor-condition share (lower share = better)

States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. States here sit immediately above and below Illinois on the same metric.

MA

Massachusetts

8.88% top marginal rate
Structure
Progressive
Burden @ $100K
$5,295

MO

Missouri

8.95% top marginal rate
Structure
Progressive
Burden @ $100K
$24,618
Selected

IL

Illinois

9.35% top marginal rate
Structure
Progressive
Burden @ $100K
$26,928

NY

New York

9.43% top marginal rate
Structure
Progressive
Burden @ $100K
$17,642

ND

North Dakota

10.98% top marginal rate
Structure
Progressive
Burden @ $100K
$4,255

Bridges Needing Most Attention in Illinois

Six lowest-condition bridges in Illinois, ranked by the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.

TR 416

Poor

Over: MCKEE CRK

4.7 MI W KELLERVILLE, Adams, IL

Built 1905 Load: 0.0 t ADT: 10

CH 11

Poor

Over: SOUTH FORKBEAR CREEK

3.96 MI N CAMP POINT, Adams, IL

Built 1975 Load: 0.0 t ADT: 725

FAS 945

Poor

Over: CLEAR CREEK DITCH

2.5 MI E OF MCCLURE, Alexander, IL

Built 1959 Load: 0.0 t ADT: 1,100

CH 4

Poor

Over: SPRING BRANCH

4.5M N KEYSPORT, Bond, IL

Built 1973 Load: 0.0 t ADT: 50

TR-164

Poor

Over: Little Beaver Creek

2 MI S DUDLEYVILLE, Bond, IL

Built 1965 Load: 0.0 t ADT: 50

TR 85

Poor

Over: MASTERS CREEK

3 MI SE OF OHIO, Bureau, IL

Built 1965 Load: 0.0 t ADT: 25

All Bridges in Illinois

CARLSON RD

Good

Over: SPRING CREEK

3.0 MI S GARDEN PRAI, Boone, IL

Built 1984 Load: 32.4 t ADT: 325

REEDS CROSSING ROA

Good

Over: MOSQUITO CREEK

4.0 MI SE BELVIDERE, Boone, IL

Built 1983 Load: 32.4 t ADT: 200

GRANGE HALL RD

Good

Over: E BR PISCASAW CR

2.5 M SE POPLAR GROV, Boone, IL

Built 1986 Load: 32.4 t ADT: 50

BLOODS POINT ROAD

Good

Over: CN RR

1.5 MI E WINN CO LN, Boone, IL

Built 1991 Load: 32.4 t ADT: 550

CALEDONIA RD

Good

Over: BEAVER CREEK

2.5 M N. OF BELVIDER, Boone, IL

Built 2003 Load: 32.4 t ADT: 3,350

MARENGO RD (TR 77)

Good

Over: MUD CREEK

1.5 MI N GARDN PRARI, Boone, IL

Built 1994 Load: 32.4 t ADT: 2,000

LAWRENCEVILLE RD

Good

Over: MUD CREEK

1.5MI. NW GARDEN PR., Boone, IL

Built 2000 Load: 32.4 t ADT: 1,400

COUNTY LINE RD

Good

Over: BR PISCASAW CREEK

1.5 MI E OF CAPRON, Boone, IL

Built 2004 Load: 32.4 t ADT: 600

GARDEN PRAIRIE RD

Good

Over: COON CREEK

1.5 MI S GARDEN PR, Boone, IL

Built 2005 Load: 32.4 t ADT: 475

IRENE RD

Good

Over: UNNAMED CREEK

1.5MI S OF US 20, Boone, IL

Built 2007 Load: 32.4 t ADT: 1,650

RIVERSIDE ROAD

Good

Over: BR OF BEAVER CR

3.5MI NE OF BELVIDER, Boone, IL

Built 2007 Load: 32.4 t ADT: 2,350

COUNTY LINE RD

Good

Over: SPRING CREEK

2 MI SE GARDEN PRAIR, Boone, IL

Built 2016 Load: 32.4 t ADT: 100

CENTERVILLE RD

Good

Over: BEAVER CREEK

2 MI W OF CAPRON, Boone, IL

Built 2013 Load: 32.4 t ADT: 150

GARDEN PRAIRIE

Good

Over: KISHWAUKEE RIVER

.5 MI N US 20, Boone, IL

Built 2015 Load: 32.4 t ADT: 2,850

POPLAR GROVE RD

Good

Over: KISHWAUKEE RIVER

NE EDGE OF BELVIDERE, Boone, IL

Built 2020 Load: 32.4 t ADT: 2,200

LIVINGSTON SCHOOL

Good

Over: SOUTH KINNIKINNICK C

3.0 MI N CALEDONIA, Boone, IL

Built 2021 Load: 32.4 t ADT: 50

TOWNLINE RD

Good

Over: BR N KINNINNICK CR

NW CORNER BOONE CO., Boone, IL

Built 1960 Load: 32.4 t ADT: 100

CALEDONIA ROAD

Good

Over: S. KINNIKINNICK CR.

3.3 MI. N. CALEDONIA, Boone, IL

Built 1995 Load: 32.4 t ADT: 1,000

POPLAR GROVE RD

Good

Over: BR. OF BEAVER CREEK

1.75 MI. N. OF IL173, Boone, IL

Built 1998 Load: 32.4 t ADT: 1,350

PEARL STREET RD

Good

Over: KINGSBURY CREEK

AT DEKALB CO. LINE, Boone, IL

Built 1999 Load: 32.4 t ADT: 500

IRENE RD

Good

Over: UNNAMED CRK

0.25 MI S OF US 20, Boone, IL

Built 1900 Load: 32.4 t ADT: 3,200

ORTH ROAD

Good

Over: BR OF BEAVER CREEK

0.6 MI. W. OF IL 76, Boone, IL

Built 2009 Load: 32.4 t ADT: 1,650

ORTH RD

Good

Over: BEAVER CREEK

4.0 MI N BELVIDERE, Boone, IL

Built 2014 Load: 32.4 t ADT: 1,650

TOWN HALL ROAD

Good

Over: UNNAMED STREAM

0.25MI S OF US 20, Boone, IL

Built 2010 Load: 32.4 t ADT: 4,950

CH 6

Good

Over: CRONIN HOLLOW

2.0 MI SW BUCKHORN, Brown, IL

Built 1999 Load: 32.4 t ADT: 400

TR 189

Good

Over: LITTLE MISSOURI CK

0.5 E. SILOM SPRINGS, Brown, IL

Built 1982 Load: 32.4 t ADT: 25

TR 81

Good

Over: LOGAN CRK

.5 MI SW OF NIOTA, Brown, IL

Built 2004 Load: 32.4 t ADT: 50

TR 230

Good

Over: YOLK CREEK

2.3 E COOPERSTOWN, Brown, IL

Built 2001 Load: 32.4 t ADT: 25

TR 151

Good

Over: BR LITTLE CREEK

3.8MI SE COOPERSTOWN, Brown, IL

Built 1991 Load: 32.4 t ADT: 75

TR 176

Good

Over: TRIB HAMILTON BR

4MI NW COOPERSTOWN, Brown, IL

Built 1998 Load: 32.4 t ADT: 50

TR 151

Good

Over: Baehr Branch

2.11 mi E TR 206, Brown, IL

Built 2014 Load: 32.4 t ADT: 75

TR 181

Good

Over: GILBIRDS CREEK

2 M NW VERSAILLES, Brown, IL

Built 2011 Load: 32.4 t ADT: 25

TR 177

Good

Over: AVERY BRANCH

4.5 M NW VERSAILLES, Brown, IL

Built 2007 Load: 32.4 t ADT: 50

TR 121

Good

Over: DRY FORK

2.8 MI SW MT STRLING, Brown, IL

Built 1984 Load: 32.4 t ADT: 25

TR 129

Good

Over: DRY FORK

2.5 M SW MT STERLING, Brown, IL

Built 2002 Load: 32.4 t ADT: 200

TR 141

Good

Over: WELLS FORK

0.9 mi E TR 10, Brown, IL

Built 2014 Load: 32.4 t ADT: 25

TR 103

Good

Over: WELLS FK CR

2 M S MOUND STATION, Brown, IL

Built 2007 Load: 32.4 t ADT: 25

TR 47

Good

Over: NORTH FORK

7.5 MI NE MT STERLNG, Brown, IL

Built 1987 Load: 32.4 t ADT: 25

TR 164

Good

Over: SHELBYCRK

2.5MNWRIPLEY, Brown, IL

Built 1996 Load: 32.4 t ADT: 25

TR 45

Good

Over: SOUTH FORK

3.75 NE MT STERLING, Brown, IL

Built 1998 Load: 32.4 t ADT: 75

TR 15

Good

Over: TRIB LITTLE MISSOURI

8.0MI N MT STERLING, Brown, IL

Built 1998 Load: 32.4 t ADT: 25

TR-55

Good

Over: Trib to N Fk Shelby

0.30 mi E IL 99, Brown, IL

Built 2017 Load: 32.4 t ADT: 25

TR 162

Good

Over: HAMILTON CREEK

2.0 MI S RIPLEY, Brown, IL

Built 2000 Load: 32.4 t ADT: 25

TR 45

Good

Over: W FORK HAMILTON CK

.75 NE MT STERLING, Brown, IL

Built 2005 Load: 32.4 t ADT: 200

TR 158

Good

Over: N. FRK OF LOGAN CRK.

3.3MI E MT. STERLING, Brown, IL

Built 1991 Load: 32.4 t ADT: 25

TR 156

Good

Over: CAMP CREEK

3.6 M NW VERSAILLES, Brown, IL

Built 1988 Load: 32.4 t ADT: 25

TR 143

Good

Over: N BR DRY FORK

2 MI W HERSMAN, Brown, IL

Built 1999 Load: 32.4 t ADT: 25

TR 126

Good

Over: TRIB TO WEST CREEK

1MI E MT STERLING, Brown, IL

Built 1997 Load: 32.4 t ADT: 250

TR 48

Good

Over: LITTLE MISSOURI

3.0 MI NE TIMEWELL, Brown, IL

Built 1983 Load: 32.4 t ADT: 50

TR 216

Good

Over: CAMP CREEK

2.5 E VERSAILES, Brown, IL

Built 1982 Load: 32.4 t ADT: 225

Showing 13,351-13,400 of 26,928 bridges

Related

All states → | National rankings → | Understanding conditions → | Retired SD term explained →
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges.

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). Poor condition is an inspection-record category, not a closure or unsafe-to-cross designation. Consult the bridge owner for current status.

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.

What to do with this

Use Illinois's inventory picture to drill to a county or a specific span.

  • Browse counties in Illinois and open the highest-Poor shares first. County list
  • See where this state sits among peers on Poor-condition share. State rankings
  • Compare this state with another jurisdiction on the same measures. State compare

NBI condition ratings are inventory snapshots, not live crossing-safety verdicts.

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. Illinois Good/Fair/Poor shares and county rollups on this page are computed from the same NBI extract as the national boards; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.