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

FREMONT ST FAU 679

Unknown

Over: US 34 BYPASS

1.13 M N OF IL41/164, Knox, IL

Built 1971 ADT: 9,100

US 34 WB

Unknown

Over: W. MAIN ST

0.3 MI W IL 41, Knox, IL

Built 1976 ADT: 7,500

US 34 EB

Unknown

Over: W MAIN ST

0.3 MI W IL 41, Knox, IL

Built 1976 ADT: 4,450

W Knox Rd

Unknown

Over: US 34

SW GALESBURG AIRPORT, Knox, IL

Built 1979 ADT: 8,950

FAS 1400-CH 9

Unknown

Over: EB and WB I 74

Knoxville Interchang, Knox, IL

Built 2016 ADT: 16,800

WB I 74

Unknown

Over: BNSF(079799R)

0.73MI S of US 34, Knox, IL

Built 2017 ADT: 1,200

EB I 74

Unknown

Over: BNSF

0.73MI S of US 34, Knox, IL

Built 2018 ADT: 1,200

FAU 6838-CH 10

Unknown

Over: BNSF RR & GRAVEL RD

NW-27-T11NR1E, Knox, IL

Built 1985 ADT: 225

AT&SF RR (004676W)

Unknown

Over: MCCLURE ST

ON MCCLURE S OF MAIN, Knox, IL

Built 1966 ADT: 1,850

BN RR (062996D)

Unknown

Over: NORTH ST

ON NORTH W.- LINCOLN, Knox, IL

Built 1888 ADT: 1,000

ADMIRAL WALKWAY

Unknown

Over: LINWOOD RD-ILL. 41

0.84 S. OF MAIN ST, Knox, IL

Built 1986 ADT: 4,300

BN RR (072662X)

Unknown

Over: ILL 8

CTR-10-T9NR4E, Knox, IL

Built 1927 ADT: 900

BN(097988K)

Unknown

Over: ILL 78

SE-12-T9NR4E, Knox, IL

Built 1919 ADT: 1,400

BN(079211T)

Unknown

Over: ILL 41

SE-20-T11NR1E, Knox, IL

Built 1903 ADT: 4,900

BN (063724U) 177.6

Unknown

Over: ILL 116

0.1 M WEST OF IL 41, Knox, IL

Built 1934 ADT: 1,100

BN RR (062985R)

Unknown

Over: SEMINARY ST

NW-14-T11NR1E, Knox, IL

Built 1900 ADT: 6,000

BN RR (093680D)

Unknown

Over: LOSEY ST

CTR-11-T11NR1E, Knox, IL

Built 1934 ADT: 5,700

ATSF (004646E)

Unknown

Over: E MAIN ST

E MAIN GALESBURG, Knox, IL

Built 1900 ADT: 1,450

BNSF (079789K)

Unknown

Over: ILL 167 (WATAGA)

NE-16-T12NR2E, Knox, IL

Built 1924 ADT: 1,150

ATSF(004625L)

Unknown

Over: ILL 180

@ WILLIAMSFIELD, Knox, IL

Built 1939 ADT: 1,350

BN RR (079800H)

Unknown

Over: FREMONT STREET

NE-11-T11NR1E, Knox, IL

Built 1900 ADT: 5,650

AT&SF RR (004632W)

Unknown

Over: CH 15

CTR-24-T11NR3E, Knox, IL

Built 1900 ADT: 625

BN RR (065617L)

Unknown

Over: TR 11

SE-4-T13NR1E, Knox, IL

Built 1900 ADT: 150

AT&SF RR (004628G)

Unknown

Over: TR 284

SW-21-T11NR4E, Knox, IL

Built 1910 ADT: 125

AT&SF RR(004644R)

Unknown

Over: MS 6000-EE ST

NE 18-T11N,R2E, Knox, IL

Built 1950 ADT: 100

BN RR (079801P)

Unknown

Over: LOSEY STREET

NE-11-T11NR1E, Knox, IL

Built 1991 ADT: 5,150

BNSF RR

Unknown

Over: FAU 6800 US 150/Main

1.43mi west of I-74, Knox, IL

Built 2017 ADT: 10,200

WASHINGTON ST

Unknown

Over: US 41

1 M S OF IL 132, Lake, IL

Built 1961 ADT: 40,100

US 12 EB

Unknown

Over: IL 176

WAUCONDA, Lake, IL

Built 1951 ADT: 18,400

US 12 WB

Unknown

Over: IL 176

WAUCONDA, Lake, IL

Built 1951 ADT: 11,300

EJEE RR

Unknown

Over: US 12 (RAND ROAD)

0.4 M SE OF ILL 22, Lake, IL

Built 1939 ADT: 36,400

BIKE PATH - MCCLOR

Unknown

Over: US 41 (SKOKIE HWY)

0.1 M S OF IL 176, Lake, IL

Built 1936 ADT: 35,100

US 41

Unknown

Over: DEERPATH RD

LAKE FOREST, Lake, IL

Built 1937 ADT: 15,000

C&NW RR

Unknown

Over: US 41 (SKOKIE HY)

.1 SO OF IL-60, Lake, IL

Built 1937 ADT: 42,200

SHERIDAN RD

Unknown

Over: IL 176 (SCRANTON RD)

GREAT LAKES NTC, Lake, IL

Built 1923 ADT: 5,050

IL 120

Unknown

Over: US 41

GURNEE, Lake, IL

Built 1959 ADT: 28,500

IL 120

Unknown

Over: RR - UP & OLD SKOKIE

GURNEE, Lake, IL

Built 1959 ADT: 275

IL 137

Unknown

Over: I- 94 TRI STATE TOLL

1.0 M W OF IL 43, Lake, IL

Built 1958 ADT: 135,200

DEERFIELD RD

Unknown

Over: BERKELEY AVE

HIGHLAND PARK, Lake, IL

Built 1961 ADT: 1,300

DEERFIELD RD

Unknown

Over: RR - UP & OLD SKOKIE

0.3 M W OF US 41, Lake, IL

Built 1962 ADT: 1,725

DEERFIELD RD

Unknown

Over: US 41

DEERFIELD & US 41, Lake, IL

Built 1960 ADT: 64,500

IL 43 NB

Unknown

Over: US 41 SB

0.25 N OF IL 120, Lake, IL

Built 1957 ADT: 40,100

EJEE RR

Unknown

Over: US 41 (SKOKIE HY)

0.6 M N OF ILL 176, Lake, IL

Built 1936 ADT: 38,000

CNW RR

Unknown

Over: ILL 176 (SCRANTON A)

0.31 M E OF ILL 131, Lake, IL

Built 1942 ADT: 9,350

CNW RR

Unknown

Over: ILL 176 (SCRANTON A)

0.32 MI E OF ILL 131, Lake, IL

Built 1942 ADT: 9,350

I-94 NB

Unknown

Over: US 41 SB (SKOKIE HY)

US 41 SB 1M N IL-173, Lake, IL

Built 1958 ADT: 24,500

IL 137

Unknown

Over: IL 137 WB OFF RAMP

1.8 M W OF IL 21, Lake, IL

Built 1966 ADT: 5,900

SOO (WICT) AMTK. R

Unknown

Over: US 41 (SKOKIE HY)

US 41 1 M SE ILL 21, Lake, IL

Built 1936 ADT: 30,500

SOO (WICT) AMTK.RR

Unknown

Over: IL-60

0.5 M W OF ILL 43, Lake, IL

Built 1940 ADT: 23,200

CM & STP RR

Unknown

Over: US 45

.03M S OF ILL 137, Lake, IL

Built 1939 ADT: 25,900

Showing 2,251-2,300 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.