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 61

Fair

Over: SUGAR CREEK

4 MI E LITTLETON, Schuyler, IL

Built 1988 Load: 32.4 t ADT: 25

TR 83A

Fair

Over: RICHIE BR. CRK.

1 MI NW OF RAY, Schuyler, IL

Built 1995 Load: 32.4 t ADT: 25

TR 105

Fair

Over: RICHIE BRANCH

2.75 MI W RAY, Schuyler, IL

Built 1995 Load: 32.4 t ADT: 25

TR 37

Fair

Over: SUGAR CREEK

7 MI NE LITTLETON, Schuyler, IL

Built 1995 Load: 32.4 t ADT: 25

TR 302

Fair

Over: SUGAR CREEK

7 MI E LITTLETON, Schuyler, IL

Built 1995 Load: 32.4 t ADT: 25

TR 234

Fair

Over: SUGAR CREEK

2.5 MI NW OF RAY, Schuyler, IL

Built 1980 Load: 32.4 t ADT: 25

TR 245

Fair

Over: HORNY BRNCH

3.0 SW RUSHVILLE, Schuyler, IL

Built 2000 Load: 32.4 t ADT: 25

TR 160

Fair

Over: HORNEY BRANCH

6.0 MI SW RUSHVILLE, Schuyler, IL

Built 1999 Load: 32.4 t ADT: 25

TR 158

Fair

Over: RYAN BRNCH

5.0 N W RIPLEY, Schuyler, IL

Built 2005 Load: 32.4 t ADT: 25

OLD US 36

Fair

Over: PLUM CREEK

1.5 MI W RIGGSTON, Scott, IL

Built 1951 Load: 32.4 t ADT: 1,850

CH 13

Fair

Over: PLUM CREEK

1.5 MI SSW EXETER, Scott, IL

Built 1977 Load: 32.4 t ADT: 125

TR 154

Fair

Over: BRUSHY CREEK

5.0 MI E WINCHESTER, Scott, IL

Built 2000 Load: 32.4 t ADT: 50

TR 136

Fair

Over: LITTLE SANDY CK

2.5 MI NE ALSEY, Scott, IL

Built 1986 Load: 32.4 t ADT: 25

TR 79

Fair

Over: BIG BRANCH

2 MI ENE WINCHESTER, Scott, IL

Built 1977 Load: 32.4 t ADT: 50

TR 104

Fair

Over: BIG SANDY CREEK

SE WINCHESTER, Scott, IL

Built 2005 Load: 32.4 t ADT: 75

TR 59

Fair

Over: PLUM CREEK

WEST OF BLOOMFIELD, Scott, IL

Built 1978 Load: 32.4 t ADT: 75

TR 55B

Fair

Over: WALNUT CREEK

1.2 M N ILL 106, Scott, IL

Built 1983 Load: 32.4 t ADT: 50

TR 23

Fair

Over: MAUVAISE TERRE CREEK

1 MI NNE MERRITT, Scott, IL

Built 1977 Load: 32.4 t ADT: 50

TR 181

Fair

Over: RICHLAND CREEK

3.8 MI SW WINDSOR, Shelby, IL

Built 1983 Load: 32.4 t ADT: 25

TR 425

Fair

Over: HENRY CREEK

1.0 MI N OF SIGEL, Shelby, IL

Built 1983 Load: 32.4 t ADT: 200

TR 223

Fair

Over: SEXSON BRANCH

3.8 MI NE STRASBURG, Shelby, IL

Built 1982 Load: 32.4 t ADT: 75

TR 40 A

Fair

Over: OPOSSUM CREEK

4.0 MI NE OCONEE, Shelby, IL

Built 1983 Load: 32.4 t ADT: 50

TR 303

Fair

Over: OPOSSUM CREEK

2.1 MI N OCONEE, Shelby, IL

Built 1982 Load: 32.4 t ADT: 75

TR 115

Fair

Over: STREAM

1.5 MI NW WINDSOR, Shelby, IL

Built 1982 Load: 32.4 t ADT: 50

TR 140

Fair

Over: MUD CREEK

3.6 MI NE TOWER HILL, Shelby, IL

Built 1981 Load: 32.4 t ADT: 75

TR 238

Fair

Over: STREAM

3 MI N OF FINDLAY, Shelby, IL

Built 1982 Load: 32.4 t ADT: 25

TR 421

Fair

Over: POLECAT CREEK

2.6 MI NE HERRICK, Shelby, IL

Built 1983 Load: 32.4 t ADT: 50

TR 70

Fair

Over: BECK'S CREEK TRIB

4.1 MI NW HERRICK, Shelby, IL

Built 1987 Load: 32.4 t ADT: 50

CH-29

Fair

Over: Long Grove Crk Trib

1.5 MI NW MOWEAQUA, Shelby, IL

Built 1983 Load: 32.4 t ADT: 125

TR 124 B

Fair

Over: MITCHELL CREEK

3.3 MI SW COWDEN, Shelby, IL

Built 1987 Load: 32.4 t ADT: 75

TR 41

Fair

Over: FLAT BRANCH

4 MI NW YANTISVILLE, Shelby, IL

Built 1992 Load: 32.4 t ADT: 50

TR 112C

Fair

Over: POLECAT CREEK

2.8 MI NE HERRICK, Shelby, IL

Built 1990 Load: 32.4 t ADT: 50

TR 335 A

Fair

Over: BRUSH CREEK

3 MI NW STEWARDSON, Shelby, IL

Built 1996 Load: 32.4 t ADT: 175

TR 78

Fair

Over: TRIB TO BECK'S CREEK

6 MI SSW TOWER HILL, Shelby, IL

Built 1999 Load: 32.4 t ADT: 100

CH 7

Fair

Over: RICHLAND CREEK

3.0 MI NW HERBORN, Shelby, IL

Built 2007 Load: 32.4 t ADT: 225

TR 140

Fair

Over: MITCHELL CREEK

2.1 MI NW COWDEN, Shelby, IL

Built 2011 Load: 32.4 t ADT: 50

ILL 177

Fair

Over: SILVER CREEK

WCL MASCOUTAH, St. Clair, IL

Built 1961 Load: 32.4 t ADT: 7,000

ILL 159

Fair

Over: W FORK RICHLAND CRK

2 M S SMITHTON, St. Clair, IL

Built 1954 Load: 32.4 t ADT: 4,600

FAI 64 WB

Fair

Over: LITTLE SILVER CREEK

1.5 MI W OF ILL 4, St. Clair, IL

Built 1971 Load: 32.4 t ADT: 20,950

US 50

Fair

Over: SILVER CREEK BKWATER

1.3 MI W ILL 4, St. Clair, IL

Built 1939 Load: 32.4 t ADT: 16,000

FAU 9166 LINCOLN H

Fair

Over: OGLES CREEK

.14 E IL 159, St. Clair, IL

Built 1985 Load: 32.4 t ADT: 17,900

IL 4

Fair

Over: N1 TRIB L SILVER CRK

2 MI N OF US 50, St. Clair, IL

Built 1930 Load: 32.4 t ADT: 6,800

IL 15

Fair

Over: Abandoned RR,Salt Storag

2 mi NW of IL 159, St. Clair, IL

Built 1959 Load: 32.4 t ADT: 21,800

LAKE DRIVE

Fair

Over: DRAINGE TO FHSP LAKE

2.5 MI NW OF IL 157, St. Clair, IL

Built 1929 Load: 32.4 t ADT: 2,750

SCOTT TROY FAU 917

Fair

Over: HAGEMANN CREEK

2.9 MI N U.S. RTE 50, St. Clair, IL

Built 1976 Load: 32.4 t ADT: 7,500

TOWN HALL ROAD CH

Fair

Over: RAYHILL SLOUGH

2.0 MI E OF ILL RTE4, St. Clair, IL

Built 1979 Load: 32.4 t ADT: 350

FAU 9167 SULLIVAN

Fair

Over: METRO LINK

0.2M N ILL 161, St. Clair, IL

Built 1980 Load: 32.4 t ADT: 8,250

BOHLEYSVILLE RD CH

Fair

Over: PRAIRIE DULONG CR

4.6 MI S MILLSTADT, St. Clair, IL

Built 1981 Load: 32.4 t ADT: 350

CEMETERY RD FAS 84

Fair

Over: JACKS RUN CREEK

0.5 MI E FREEBURG, St. Clair, IL

Built 1983 Load: 32.4 t ADT: 1,050

FAU 9175

Fair

Over: OGLE CREEK

0.5M S MADISON C LN, St. Clair, IL

Built 1983 Load: 32.4 t ADT: 8,100

Showing 9,501-9,550 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.