State profile · Near median Poor share

Illinois bridge safety

Condition ratings, load ratings, and Poor-condition data for every public highway bridge in Illinois, based on the FHWA National Bridge Inventory.

27,743
Public bridges
41.2%
Good condition
7.9%
Poor condition

Data updated May 2026

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 whose lowest applicable component is rated 0-4

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 - Poor-condition share 26.3%
National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.

Condition Distribution

Illinois48.2%42.6%9.2%GoodFairPoor
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 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.

RI

Rhode Island

7.69% top marginal rate
Structure
Progressive
Burden @ $100K
$78

NE

Nebraska

7.73% top marginal rate
Structure
Progressive
Burden @ $100K
$15,571
Selected

IL

Illinois

7.88% top marginal rate
Structure
Progressive
Burden @ $100K
$27,743

MA

Massachusetts

7.96% top marginal rate
Structure
Progressive
Burden @ $100K
$5,314

MO

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 the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.

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

Poor

Over: WILSON CREEK

NE-35-T3NR2E, Fulton, IL

Built 1935 Load: 1.3 t ADT: 10

TR 10-B

Poor

Over: KING CREEK

W EDGE OF MINERAL, Bureau, IL

Built 1899 Load: 1.6 t ADT: 10

TR-6

Poor

Over: DRAINAGE DITCH

3.5 MI NE DIETERICH, Effingham, IL

Built 1909 Load: 1.6 t ADT: 25

TR208K(TWIN BRIDGE

Poor

Over: BIG CREEK

NE EDGE MT ZION, Macon, IL

Built 1967 Load: 1.9 t ADT: 375

All Bridges in Illinois

TR 114

Good

Over: TRIB TO POPE CREEK

W CTR-9-T13NR2E, Knox, IL

Built 2000 Load: 32.4 t ADT: 25

TR 324 B

Good

Over: KICKAPOO CREEK

SW-24-T9NR4E, Knox, IL

Built 2002 Load: 32.4 t ADT: 650

TR 76A

Good

Over: S HENDERSON CREEK

E CTR-23-T12NR1E, Knox, IL

Built 2002 Load: 32.4 t ADT: 50

COUNTY HIGHWAY 29

Good

Over: TRIB TO LITTLERS CRK

E.CTR-31-T9NR3E, Knox, IL

Built 2004 Load: 32.4 t ADT: 100

TR 172

Good

Over: TRIB TO SPOON RIVER

S1/2-36-T9NR2E, Knox, IL

Built 2003 Load: 32.4 t ADT: 25

TR 231

Good

Over: HAW CREEK

S.CTR-32-T11NR2E, Knox, IL

Built 2003 Load: 32.4 t ADT: 275

CO HWY 1

Good

Over: HENDERSON CREEK

SW-23.T12NR1E, Knox, IL

Built 2005 Load: 32.4 t ADT: 800

TR 217

Good

Over: HAW CREEK

SW-25-T11NR1E, Knox, IL

Built 2003 Load: 32.4 t ADT: 50

TR 154

Good

Over: COURT CREEK

NW-23-T11NR2E, Knox, IL

Built 2004 Load: 32.4 t ADT: 175

TR 136

Good

Over: COURT CREEK

NE-22-T11NR2E, Knox, IL

Built 2004 Load: 32.4 t ADT: 150

CO.LINE RD.STARK T

Good

Over: FITCH CREEK

NE-13-T13NR4E, Knox, IL

Built 2004 Load: 32.4 t ADT: 150

TR 245

Good

Over: TRIB TO HAW CREEK

NW-12-T10NR2E, Knox, IL

Built 2006 Load: 32.4 t ADT: 25

TR 176/Barefoot Rd

Good

Over: COURT CREEK

W1/2-19-T11NR3E, Knox, IL

Built 2013 Load: 32.4 t ADT: 150

TR 320

Good

Over: TRIB TO WALNUT CREEK

N1/2-11-T12NR4E, Knox, IL

Built 2007 Load: 32.4 t ADT: 25

CH 16

Good

Over: FITCH CREEK

CNTR SEC 26 T13N,R4E, Knox, IL

Built 2009 Load: 32.4 t ADT: 150

CH 7

Good

Over: SUGAR CREEK

3 Mi. S. of Ill. 167, Knox, IL

Built 2016 Load: 32.4 t ADT: 100

TR 320

Good

Over: FITCH CREEK

NW-36-T13NR4E, Knox, IL

Built 2006 Load: 32.4 t ADT: 25

TR 171

Good

Over: SNAKEDEN HOLLOWCREEK

NW-8-T11NR4E, Knox, IL

Built 2008 Load: 32.4 t ADT: 50

TR 251

Good

Over: SWAB RUN CREEK

NE-24-T10NR4E, Knox, IL

Built 2010 Load: 32.4 t ADT: 75

TR 183

Good

Over: NORTH CREEK

SW-7-T11NR3E, Knox, IL

Built 2011 Load: 32.4 t ADT: 75

TR 23

Good

Over: TRIB N HENDERSON CRK

NE-18-T13NR1E, Knox, IL

Built 2010 Load: 32.4 t ADT: 10

TR 119

Good

Over: South Henderson Crk

NE-19-T12N-R1E, Knox, IL

Built 2012 Load: 32.4 t ADT: 50

TR 304

Good

Over: SWAB RUB CREEK

1.3 Mi N. of Ill. 8, Knox, IL

Built 2015 Load: 32.4 t ADT: 25

TR 29

Good

Over: Mud Run Creek

NE-23-T13NR3E, Knox, IL

Built 2012 Load: 32.4 t ADT: 10

TR 278

Good

Over: WALNUT CREEK TRIB

2 Mi W. of Il. 180, Knox, IL

Built 2015 Load: 32.4 t ADT: 25

TR-65

Good

Over: Fitch Creek

3.5 Mi W of IL 78, Knox, IL

Built 2017 Load: 32.4 t ADT: 50

FAS 397 - CH 8

Good

Over: HAW CREEK

NW-4-T10NR2E, Knox, IL

Built 1965 Load: 32.4 t ADT: 1,300

TR 21A

Good

Over: STREAM

NW1/4SEC15R2ET13N, Knox, IL

Built 1996 Load: 32.4 t ADT: 10

TR 272

Good

Over: STREAM

NW-29-T11NR4E, Knox, IL

Built 2001 Load: 32.4 t ADT: 25

CH 18

Good

Over: TRIB TO SPOON RIV

N.CTR-25-T11NR4E, Knox, IL

Built 2007 Load: 32.4 t ADT: 325

TR 253

Good

Over: TRIB TO SPOON RIVER

SW-8-T10NR4E, Knox, IL

Built 2006 Load: 32.4 t ADT: 50

TR 22

Good

Over: NORTH HENDERSON CRK

NW COR-17-T13NR1E, Knox, IL

Built 2006 Load: 32.4 t ADT: 75

Main St / FAS 393

Good

Over: Walnut Creek Trib

E.CTR-16-T13NR3E, Knox, IL

Built 2015 Load: 32.4 t ADT: 700

TR 201

Good

Over: TRIB CEDAR CREEK

W.CTR-20-T11NR1E, Knox, IL

Built 2020 Load: 32.4 t ADT: 275

PARK ROAD

Good

Over: TRIB S HENDERSON CRK

NE-34-T12NR1E, Knox, IL

Built 1998 Load: 32.4 t ADT: 250

CHAMBERS ST

Good

Over: CEDAR CREEK

ON CHAMBER S.-GROVE, Knox, IL

Built 1930 Load: 32.4 t ADT: 1,700

FARNHAM ST

Good

Over: AT&SF (004649A)

2 BLKS N. OF MAIN ST, Knox, IL

Built 1976 Load: 32.4 t ADT: 6,800

ACADEMY ST

Good

Over: CEDAR CREEK

ONE BLOCK N OF MAIN, Knox, IL

Built 1931 Load: 32.4 t ADT: 1,500

Seminary Street

Good

Over: BNSF Railroad

Galesburg, Knox, IL

Built 2015 Load: 32.4 t ADT: 7,150

FAU 6779- CO LINE

Good

Over: CEDAR CREEK TRIB

Galesburg, Knox, IL

Built 2014 Load: 32.4 t ADT: 75

1ST ST

Good

Over: BN RR (072645G)

CTR-33-T10NR1E, Knox, IL

Built 1996 Load: 32.4 t ADT: 375

LATIMER ST

Good

Over: BN RR (072641E)

S1/2-33-T10NR1E, Knox, IL

Built 1997 Load: 32.4 t ADT: 500

EAST MARTIN ST

Good

Over: BN RR (072643T)

N. CTR-4-T9NR1E, Knox, IL

Built 1996 Load: 32.4 t ADT: 1,050

SEMINARY STREET

Good

Over: CEDAR CREEK

SE-10-T11NR1E, Knox, IL

Built 2015 Load: 32.4 t ADT: 7,150

TR 176/Barefoot Rd

Good

Over: BNSF RR

SW-19-T11NR3E, Knox, IL

Built 2013 Load: 32.4 t ADT: 150

BIG HOLLOW ROAD

Good

Over: REDHEAD LAKE CHANNEL

.6 M W OF US-12, Lake, IL

Built 1999 Load: 32.4 t ADT: 13,200

IL 176

Good

Over: EAST SKOKIE DITCH

0.35 M E OF US 41, Lake, IL

Built 2011 Load: 32.4 t ADT: 15,800

MIDLOTHIAN RD

Good

Over: DETENTION PD OUTLET

0.3 MI N PETERSON RD, Lake, IL

Built 2011 Load: 32.4 t ADT: 3,000

DIAMOND LAKE ROAD

Good

Over: INDIAN CREEK

0.75M N OF GILMER RD, Lake, IL

Built 2015 Load: 32.4 t ADT: 2,650

GRASS LAKE ROAD

Good

Over: FOX RIVER

2 M E OF STATE PK RD, Lake, IL

Built 1948 Load: 32.4 t ADT: 6,300

Showing 18,501-18,550 of 27,743 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.

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.