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

FAS-787

Fair

Over: NORTH FORK CREEK

1 MI W PATOKA, Marion, IL

Built 1976 Load: 24.3 t ADT: 350

TR-445B

Fair

Over: WEBSTER CREEK

0.5 MI S CENTRALIA, Marion, IL

Built 1909 Load: 24.3 t ADT: 25

FAU 8591

Fair

Over: MARTIN BRANCH

1 MI E CENTRAL CITY, Marion, IL

Built 1941 Load: 24.3 t ADT: 2,450

SE 7TH STREET

Fair

Over: CREEK

SANDOVAL, Marion, IL

Built 1909 Load: 24.3 t

TR-415

Fair

Over: SCHWARTZ BRANCH

1 MI NW WALNUT HILL, Marion, IL

Built 1909 Load: 24.3 t ADT: 75

JEFFERSON AVE 7520

Fair

Over: TOWN CREEK

SALEM, Marion, IL

Built 1964 Load: 24.3 t ADT: 425

TR 3 (TH-C52)

Fair

Over: CREEK

T13N R8E 4PM SEC 3, Marshall, IL

Built 1936 Load: 24.3 t ADT: 50

FAS 371 (CH S-32)

Fair

Over: PIGEON CREEK

T29N-R2W-3PM SEC 14, Marshall, IL

Built 1983 Load: 24.3 t ADT: 450

TR 8 (TH-R56)

Fair

Over: CROW CREEK

T13N-R8E-4PM SEC 4, Marshall, IL

Built 1972 Load: 24.3 t ADT: 10

TR 48 (TH-S18)

Fair

Over: CREEK

T13N-R9E-4PM SEC 26, Marshall, IL

Built 1975 Load: 24.3 t ADT: 25

TR 69A (TH-C65)

Fair

Over: JUDD CREEK

T30N-R1E-3PM SEC 29, Marshall, IL

Built 1977 Load: 24.3 t ADT: 75

TR 102A (TH-S40)

Fair

Over: CREEK

T29N-R1W-3PM SEC 8, Marshall, IL

Built 1974 Load: 24.3 t ADT: 25

TR 126 (TH-S48)

Fair

Over: CREEK

T29N-R1W-3PM SEC 23, Marshall, IL

Built 1977 Load: 24.3 t ADT: 50

TR 75 (TH-C69)

Fair

Over: STRAWN CREEK

T29N-R2W-3PM SEC 4, Marshall, IL

Built 1969 Load: 24.3 t ADT: 25

TR 95

Fair

Over: HARDIN DITCH

2 MI N OF EASTON, Mason, IL

Built 1976 Load: 24.3 t ADT: 50

TR 254

Fair

Over: ASH GROVE DITCH

3.5 MI NW SAN JOSE, Mason, IL

Built 1976 Load: 24.3 t ADT: 25

TR 276

Fair

Over: ROGERS DITCH

3.5 MI SE MASON CITY, Mason, IL

Built 1970 Load: 24.3 t ADT: 75

I 24 WB

Fair

Over: CNIC RR

5.2 MI S JOHNSON CO, Massac, IL

Built 1971 Load: 24.3 t ADT: 10,600

FAS 1438-CH 6

Fair

Over: BR SPRING CR

W-8-T6NR3W, McDonough, IL

Built 1942 Load: 24.3 t ADT: 150

CH 18

Fair

Over: KILLJORDAN CREEK

S.CTR-10-T5NR3W, McDonough, IL

Built 1939 Load: 24.3 t ADT: 375

CH 18

Fair

Over: KILLJORDAN CREEK

W.CTR-22-T5NR3W, McDonough, IL

Built 1943 Load: 24.3 t ADT: 150

CH 17

Fair

Over: CARTER CR

SW-18-T4NR1W, McDonough, IL

Built 1955 Load: 24.3 t ADT: 50

FAS 1438-CH 6

Fair

Over: SPRING CR

S.CTR-5-T6NR3W, McDonough, IL

Built 1930 Load: 24.3 t ADT: 100

TR-418

Fair

Over: Drowning Fork

SE-21-T7NR1W, McDonough, IL

Built 1956 Load: 24.3 t ADT: 325

TR 226

Fair

Over: KILJORDAN CR

S.CTR-9-T5NR3W, McDonough, IL

Built 1910 Load: 24.3 t ADT: 50

TR 200

Fair

Over: BR TROUBLESOME

S.CTR-29-T5NR3W, McDonough, IL

Built 1930 Load: 24.3 t ADT: 50

AMES RD

Fair

Over: Sleepy Hollow Creek

0.3 MI W BARREVILLE, McHenry, IL

Built 1950 Load: 24.3 t ADT: 1,300

RIVERSIDE DR

Fair

Over: DUTCH CREEK

0.4 S JOHNSBURG RD, McHenry, IL

Built 1953 Load: 24.3 t ADT: 3,600

MILLSTREAM DRIVE

Fair

Over: BOONE CREEK

.3 M N 120.3 M W 31, McHenry, IL

Built 1965 Load: 24.3 t ADT: 2,550

I-39/US 51

Fair

Over: MACKINAW RIVER

8.8 MI N OF I-55, McLean, IL

Built 1989 Load: 24.3 t ADT: 18,700

TR 203 A

Fair

Over: BRANCH MACKINAW RV

2.0 MI SSW ANCHOR, McLean, IL

Built 1962 Load: 24.3 t ADT: 50

FAS 489 CH 21

Fair

Over: BR KICKAPOO CRK

2.5 MI SW ELLSWORTH, McLean, IL

Built 1985 Load: 24.3 t ADT: 1,400

2750 N (TR0041)

Fair

Over: BUCK CREEK

2.5 MI SSE GRIDLEY, McLean, IL

Built 2004 Load: 24.3 t ADT: 50

JOSLYNN ST

Fair

Over: BR KICKAPOO CR

HEYWORTH NW SECTION, McLean, IL

Built 1940 Load: 24.3 t ADT: 800

TR 209

Fair

Over: MONEY CREEK

2.5 MI SE TOWANDA, McLean, IL

Built 1963 Load: 24.3 t ADT: 50

CH 14

Fair

Over: TOWN BRANCH

S MAIN ST., ATHENS, Menard, IL

Built 1992 Load: 24.3 t ADT: 1,450

FAS 214-CH 13

Fair

Over: DOUGLAS CREEK

SE-2-T13NR4W, Mercer, IL

Built 1942 Load: 24.3 t ADT: 100

FAS 214-CH 13

Fair

Over: LITTLE CAMP CREEK

E.CTR-34-T15NR4W, Mercer, IL

Built 1948 Load: 24.3 t ADT: 75

TR 196

Fair

Over: GOOSE RUN

NW-19-T13NR2W, Mercer, IL

Built 1975 Load: 24.3 t ADT: 25

TR 284

Fair

Over: N. POPE CREEK

NW-24-T14NR1W, Mercer, IL

Built 1963 Load: 24.3 t ADT: 75

TR 114/ LRC RD.

Fair

Over: FOUNTAIN CK

SEC10 RD DIST 7, Monroe, IL

Built 1935 Load: 24.3 t ADT: 100

BRICKEY RD TR 119

Fair

Over: BLACK CREEK

ROAD DIST #1, Monroe, IL

Built 1910 Load: 24.3 t ADT: 150

L ROAD TR 136

Fair

Over: ROCKEY BROOK

RD DIST 1 SEC 19, Monroe, IL

Built 1962 Load: 24.3 t ADT: 75

GOEDDELTOWN RO TR

Fair

Over: PRAIRIE CK

RD.DIST NO.2, Monroe, IL

Built 1983 Load: 24.3 t ADT: 75

NEW HOPE RD

Fair

Over: THREE MILE BRANCH

4.0 MI N LITCHFIELD, Montgomery, IL

Built 1939 Load: 24.3 t ADT: 100

TR 52

Fair

Over: HORSE CRK

1.5 MI S WAGGONER, Montgomery, IL

Built 1965 Load: 24.3 t ADT: 50

TR 0463

Fair

Over: GILHAM CK

2.0 MI W VANBURENSBU, Montgomery, IL

Built 1951 Load: 24.3 t ADT: 25

CH 14

Fair

Over: LAKE LOU YAEGER SPWY

2 MI NE LITCHFIELD, Montgomery, IL

Built 1965 Load: 24.3 t ADT: 600

WOOD ST

Fair

Over: DITCH

HILLSBORO, Montgomery, IL

Built 1920 Load: 24.3 t ADT: 850

TREMONT ST

Fair

Over: DITCH

HILLSBORO, Montgomery, IL

Built 1914 Load: 24.3 t ADT: 1,150

Showing 5,451-5,500 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.