Total Bridges
27,743
Public highway bridges in Illinois
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
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)
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
31
Nebraska
7.73% top marginal rate
17
Illinois
7.88% top marginal rate
25
Massachusetts
7.96% top marginal rate
29
Missouri
8.53% top marginal rate
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
PoorOver: DRAINAGE CANAL
2.2 MI E MEYER, Adams, IL
Built 1980 Load: 0.6 t ADT: 200
CH 15
PoorOver: 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 DeficientOver: WILSON CREEK
NE-35-T3NR2E, Fulton, IL
Built 1935 Load: 1.3 t ADT: 10
TR 10-B
Structurally DeficientOver: KING CREEK
W EDGE OF MINERAL, Bureau, IL
Built 1899 Load: 1.6 t ADT: 10
TR-6
Structurally DeficientOver: DRAINAGE DITCH
3.5 MI NE DIETERICH, Effingham, IL
Built 1909 Load: 1.6 t ADT: 25
TR208K(TWIN BRIDGE
Structurally DeficientOver: BIG CREEK
NE EDGE MT ZION, Macon, IL
Built 1967 Load: 1.9 t ADT: 375
All Bridges in Illinois
I 24 EB
UnknownOver: INTERSTATE 57
PULLEY'S MILL INTER, Williamson, IL
Built 1972 ADT: 15,800
I 57 NB
UnknownOver: OLD ROUTE 13
IN MARION, Williamson, IL
Built 2009 ADT: 11,800
I 57 SB
UnknownOver: OLD ROUTE 13
IN MARION, Williamson, IL
Built 2009 ADT: 11,800
I-57 NB
UnknownOver: IL 13
S OF NCL MARION, Williamson, IL
Built 2013 ADT: 24,900
I-57 SB
UnknownOver: IL 13
S OF NCL MARION, Williamson, IL
Built 2013 ADT: 25,900
THE HILL AVE
UnknownOver: I-57
0.47MI E HALFWAY RD, Williamson, IL
Built 2008 ADT: 41,300
WB IL 13
UnknownOver: MARATHON DR
MARION, Williamson, IL
Built 2015 ADT: 750
EB IL 13
UnknownOver: MARATHON DR
MARION, Williamson, IL
Built 2014 ADT: 750
MORGAN AVE TO I-57
UnknownOver: IL 13
S OF NCL MARION, Williamson, IL
Built 2015 ADT: 3,850
I-57NB TO MORGAN A
UnknownOver: IL 13 EB TO I-57 NB
S OF NCL MARION, Williamson, IL
Built 2015 ADT: 800
WOLF CREEK RD
UnknownOver: IL 13
CRAINVILLE, Williamson, IL
Built 2017 ADT: 23,200
WESTMINSTER DR
UnknownOver: I-57
0.25 MI E WCL MARION, Williamson, IL
Built 2023 ADT: 2,250
ICG R.R.
UnknownOver: FAS 903
1 MI. W. SALINE CO., Williamson, IL
Built 1900 ADT: 450
B.N. R.R.
UnknownOver: FAS 1900
1 MI. W. ILL. 37, Williamson, IL
Built 1900 ADT: 1,100
B.N. R. R.
UnknownOver: OLD ROUTE 13
W. C.L. MARION, Williamson, IL
Built 1900 ADT: 7,900
ICG RR
UnknownOver: TR 9
FRANKLIN CO. L., Williamson, IL
Built 1900 ADT: 100
B.N. R.R.
UnknownOver: TR 385
0.5 MI. E. I-57, Williamson, IL
Built 1900 ADT: 50
CNIC RR
UnknownOver: FAP 331-IL 13
0.25 MI W SALINE CO, Williamson, IL
Built 1998 ADT: 9,000
ILL 251 S B
UnknownOver: ROCKTON ROAD
2.6 MI S ILL 75, Winnebago, IL
Built 1967 ADT: 12,400
ILL 251 N B
UnknownOver: ROCKTON ROAD
2.6 MI S ILL 75, Winnebago, IL
Built 1967 ADT: 9,150
US RT 20 WB
UnknownOver: US 20BR EB
3 MI W OF ROCKFORD, Winnebago, IL
Built 1961 ADT: 5,350
US 20 WB
UnknownOver: CUNNINGHAM RD.
1 MI E MERIDIAN RD, Winnebago, IL
Built 1964 ADT: 1,850
US 20 EB
UnknownOver: CUNNINGHAM RD.
1 MI E MERIDIAN RD, Winnebago, IL
Built 1964 ADT: 1,850
US 20 WB
UnknownOver: PRAIRIE RD
1 MI W OF ILL 2, Winnebago, IL
Built 1964 ADT: 1,550
US 20 EB
UnknownOver: PRAIRIE RD
1 MI W OF ILL 2, Winnebago, IL
Built 1964 ADT: 1,550
US 20 E B
UnknownOver: SIMPSON RD
0.8 MI W OF ILL 2, Winnebago, IL
Built 1964 ADT: 700
US 20 W B
UnknownOver: SIMPSON RD
0.8 MI W OF ILL 2, Winnebago, IL
Built 1964 ADT: 700
US 20 E B
UnknownOver: KISHWAUKEE ST.
.8 MI W OF ILL 251, Winnebago, IL
Built 1960 ADT: 7,000
US 20 W B
UnknownOver: KISHWAUKEE ST.
.8 MI W OF ILL 251, Winnebago, IL
Built 1960 ADT: 7,000
US 20 E B
UnknownOver: ILL 251 (11TH ST)
S EDGE ROCKFORD, Winnebago, IL
Built 1960 ADT: 16,900
US 20 W B
UnknownOver: ILL 251 (11TH ST)
S EDGE ROCKFORD, Winnebago, IL
Built 1960 ADT: 16,500
I-39 NB
UnknownOver: HARRISON AVE
.6 MI S OF I-90, Winnebago, IL
Built 1963 ADT: 18,900
I-39 SB
UnknownOver: HARRISON AVE
.6 MI S OF I-90, Winnebago, IL
Built 1963 ADT: 17,700
MONTAGUE RD
UnknownOver: US RT 20
1.5 MI E MERIDIAN RD, Winnebago, IL
Built 1964 ADT: 20,400
MERIDIAN RD
UnknownOver: US RT 20
1 MI S OF RT 20BR, Winnebago, IL
Built 1964 ADT: 14,600
WELDON RD
UnknownOver: US RT 20
.2 MI S RT 20 BR, Winnebago, IL
Built 1961 ADT: 11,400
FOREST HILLS RD SB
UnknownOver: IL 251 NB
IN ROCKFORD, Winnebago, IL
Built 1971 ADT: 16,300
HONONEGAH ROAD
UnknownOver: ILL 2
IN ROCKTON, Winnebago, IL
Built 1966 ADT: 8,550
IL 2 S B
UnknownOver: SOO RR &OLD RIVER RD
0.3 M S HONONEGAH RD, Winnebago, IL
Built 1966 ADT: 3,000
ILL 2 N B
UnknownOver: SOO RR &OLD RIVER RD
0.3 M S HONONEGAH RD, Winnebago, IL
Built 1966 ADT: 3,000
MULFORD RD
UnknownOver: I-39 & US 20
.5 MI E OF US 51, Winnebago, IL
Built 1976 ADT: 50,900
I-39 OFF RAMP
UnknownOver: US 20 BYPASS
SW EDGE OF ROCKFORD, Winnebago, IL
Built 1981 ADT: 26,500
I-39 SB
UnknownOver: FAP 301(US20 BYPASS)
0.4 MI W OF MULFORD, Winnebago, IL
Built 1981 ADT: 26,500
I-39 RAMP
UnknownOver: LINDEN ROAD
.25 MI S OF US20, Winnebago, IL
Built 1981 ADT: 5,950
I-39 RAMP
UnknownOver: LINDEN RD
0.25 MI S OF US 20, Winnebago, IL
Built 1981 ADT: 5,950
I-39 NB
UnknownOver: LINDEN ROAD
0.25 MI S OF US 20, Winnebago, IL
Built 1981 ADT: 5,950
I-39 RAMP 389
UnknownOver: I-39 & US 51 SB
0.35 MI S OF US 20, Winnebago, IL
Built 1981 ADT: 25,200
I-39 & US 51 SB
UnknownOver: BLACKHAWK RD
1.75 MI S OF US 20, Winnebago, IL
Built 1981 ADT: 2,800
I-39 & US 51 NB
UnknownOver: BLACKHAWK ROAD
1.75 MI S OF US 20, Winnebago, IL
Built 1981 ADT: 2,800
TR 251-ROTARY RD
UnknownOver: I-39 & US 51
1.5 MI N OF OGLE CO, Winnebago, IL
Built 1980 ADT: 29,000
Showing 3,901-3,950 of 27,743 bridges
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.
| Publisher | Kiznis Studio |
| Sources | FHWA National Bridge Inventory, public U.S. government datasets |