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
FREMONT ST FAU 679
UnknownOver: US 34 BYPASS
1.13 M N OF IL41/164, Knox, IL
Built 1971 ADT: 9,100
US 34 WB
UnknownOver: W. MAIN ST
0.3 MI W IL 41, Knox, IL
Built 1976 ADT: 7,500
US 34 EB
UnknownOver: W MAIN ST
0.3 MI W IL 41, Knox, IL
Built 1976 ADT: 4,450
W Knox Rd
UnknownOver: US 34
SW GALESBURG AIRPORT, Knox, IL
Built 1979 ADT: 8,950
FAS 1400-CH 9
UnknownOver: EB and WB I 74
Knoxville Interchang, Knox, IL
Built 2016 ADT: 16,800
WB I 74
UnknownOver: BNSF(079799R)
0.73MI S of US 34, Knox, IL
Built 2017 ADT: 1,200
EB I 74
UnknownOver: BNSF
0.73MI S of US 34, Knox, IL
Built 2018 ADT: 1,200
FAU 6838-CH 10
UnknownOver: BNSF RR & GRAVEL RD
NW-27-T11NR1E, Knox, IL
Built 1985 ADT: 225
AT&SF RR (004676W)
UnknownOver: MCCLURE ST
ON MCCLURE S OF MAIN, Knox, IL
Built 1966 ADT: 1,850
BN RR (062996D)
UnknownOver: NORTH ST
ON NORTH W.- LINCOLN, Knox, IL
Built 1888 ADT: 1,000
ADMIRAL WALKWAY
UnknownOver: LINWOOD RD-ILL. 41
0.84 S. OF MAIN ST, Knox, IL
Built 1986 ADT: 4,300
BN RR (072662X)
UnknownOver: ILL 8
CTR-10-T9NR4E, Knox, IL
Built 1927 ADT: 900
BN(097988K)
UnknownOver: ILL 78
SE-12-T9NR4E, Knox, IL
Built 1919 ADT: 1,400
BN(079211T)
UnknownOver: ILL 41
SE-20-T11NR1E, Knox, IL
Built 1903 ADT: 4,900
BN (063724U) 177.6
UnknownOver: ILL 116
0.1 M WEST OF IL 41, Knox, IL
Built 1934 ADT: 1,100
BN RR (062985R)
UnknownOver: SEMINARY ST
NW-14-T11NR1E, Knox, IL
Built 1900 ADT: 6,000
BN RR (093680D)
UnknownOver: LOSEY ST
CTR-11-T11NR1E, Knox, IL
Built 1934 ADT: 5,700
ATSF (004646E)
UnknownOver: E MAIN ST
E MAIN GALESBURG, Knox, IL
Built 1900 ADT: 1,450
BNSF (079789K)
UnknownOver: ILL 167 (WATAGA)
NE-16-T12NR2E, Knox, IL
Built 1924 ADT: 1,150
ATSF(004625L)
UnknownOver: ILL 180
@ WILLIAMSFIELD, Knox, IL
Built 1939 ADT: 1,350
BN RR (079800H)
UnknownOver: FREMONT STREET
NE-11-T11NR1E, Knox, IL
Built 1900 ADT: 5,650
AT&SF RR (004632W)
UnknownOver: CH 15
CTR-24-T11NR3E, Knox, IL
Built 1900 ADT: 625
BN RR (065617L)
UnknownOver: TR 11
SE-4-T13NR1E, Knox, IL
Built 1900 ADT: 150
AT&SF RR (004628G)
UnknownOver: TR 284
SW-21-T11NR4E, Knox, IL
Built 1910 ADT: 125
AT&SF RR(004644R)
UnknownOver: MS 6000-EE ST
NE 18-T11N,R2E, Knox, IL
Built 1950 ADT: 100
BN RR (079801P)
UnknownOver: LOSEY STREET
NE-11-T11NR1E, Knox, IL
Built 1991 ADT: 5,150
BNSF RR
UnknownOver: FAU 6800 US 150/Main
1.43mi west of I-74, Knox, IL
Built 2017 ADT: 10,200
WASHINGTON ST
UnknownOver: US 41
1 M S OF IL 132, Lake, IL
Built 1961 ADT: 40,100
US 12 EB
UnknownOver: IL 176
WAUCONDA, Lake, IL
Built 1951 ADT: 18,400
US 12 WB
UnknownOver: IL 176
WAUCONDA, Lake, IL
Built 1951 ADT: 11,300
EJEE RR
UnknownOver: US 12 (RAND ROAD)
0.4 M SE OF ILL 22, Lake, IL
Built 1939 ADT: 36,400
BIKE PATH - MCCLOR
UnknownOver: US 41 (SKOKIE HWY)
0.1 M S OF IL 176, Lake, IL
Built 1936 ADT: 35,100
US 41
UnknownOver: DEERPATH RD
LAKE FOREST, Lake, IL
Built 1937 ADT: 15,000
C&NW RR
UnknownOver: US 41 (SKOKIE HY)
.1 SO OF IL-60, Lake, IL
Built 1937 ADT: 42,200
SHERIDAN RD
UnknownOver: IL 176 (SCRANTON RD)
GREAT LAKES NTC, Lake, IL
Built 1923 ADT: 5,050
IL 120
UnknownOver: US 41
GURNEE, Lake, IL
Built 1959 ADT: 28,500
IL 120
UnknownOver: RR - UP & OLD SKOKIE
GURNEE, Lake, IL
Built 1959 ADT: 275
IL 137
UnknownOver: I- 94 TRI STATE TOLL
1.0 M W OF IL 43, Lake, IL
Built 1958 ADT: 135,200
DEERFIELD RD
UnknownOver: BERKELEY AVE
HIGHLAND PARK, Lake, IL
Built 1961 ADT: 1,300
DEERFIELD RD
UnknownOver: RR - UP & OLD SKOKIE
0.3 M W OF US 41, Lake, IL
Built 1962 ADT: 1,725
DEERFIELD RD
UnknownOver: US 41
DEERFIELD & US 41, Lake, IL
Built 1960 ADT: 64,500
IL 43 NB
UnknownOver: US 41 SB
0.25 N OF IL 120, Lake, IL
Built 1957 ADT: 40,100
EJEE RR
UnknownOver: US 41 (SKOKIE HY)
0.6 M N OF ILL 176, Lake, IL
Built 1936 ADT: 38,000
CNW RR
UnknownOver: ILL 176 (SCRANTON A)
0.31 M E OF ILL 131, Lake, IL
Built 1942 ADT: 9,350
CNW RR
UnknownOver: ILL 176 (SCRANTON A)
0.32 MI E OF ILL 131, Lake, IL
Built 1942 ADT: 9,350
I-94 NB
UnknownOver: US 41 SB (SKOKIE HY)
US 41 SB 1M N IL-173, Lake, IL
Built 1958 ADT: 24,500
IL 137
UnknownOver: IL 137 WB OFF RAMP
1.8 M W OF IL 21, Lake, IL
Built 1966 ADT: 5,900
SOO (WICT) AMTK. R
UnknownOver: US 41 (SKOKIE HY)
US 41 1 M SE ILL 21, Lake, IL
Built 1936 ADT: 30,500
SOO (WICT) AMTK.RR
UnknownOver: IL-60
0.5 M W OF ILL 43, Lake, IL
Built 1940 ADT: 23,200
CM & STP RR
UnknownOver: US 45
.03M S OF ILL 137, Lake, IL
Built 1939 ADT: 25,900
Showing 2,251-2,300 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 |